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Observations for 2023 August 27


It was foggy in the Lower Geyser Basin, and we arrived by bicycle at Great Fountain while it was in eruption, probably the third series of bursts. Knowing the time of an eruption, decided to attempt to see the next eruption that evening.

In the afternoon, went out ot Grand as the weather was getting worse. Fortunately, and despite a long Turban Delay Interval, got to see the One Burst Grand eruption before the rain.

2023-Aug-27:16:21:21 D0/T1Q

16:20:36	Turban		-0m45s
16:21:14	Boop		-0m07s
16:21:21	Grand B1	---	d=11m23s
16:22:34	Vent Ovfl	1m12s
16:23:45	Vent		2m23s
16:32:44	P1		11m23s
16:33:39	V&T Quit	12m17s

				     	ΣD=11m23s
	* * * * *
15:45:43			d=4m33s 	
		     Turban: 34m52s

The forecast storm never really materialized, so by 19:00, went back to Great Fountain. Arrived to find the water level in the crater out of sight. Over the next hour, as the sun set, the water level would come into sight, only to sink again. After sunset, the overflow had not yet started, so we decided to head back instead of waiting at least another 1-1/2 hours.

The sky had cleared by the time Grand was due to erupt. Waited for an hour's worth of Turban eruptions, then got the One Burst Grand eruption that lasted less than ten minutes. But as we were crossing the bridge, Castle started erupting. For once, a Castle eruption with the moon in the proper location resulted in a major eruption with full arc moonbows starting about the time the eruption turned into steam.

2023-Aug-27:23:17:28 T1C

Yesterday 23:16:43	Turban		-0m45s
Yesterday 23:17:28	Grand B1	---	d=9m52s
Yesterday 23:27:20	P1		9m52s
Vent & Turban continue

				     	ΣD=9m52s
	* * * * *
Yesterday 22:04:41			
Yesterday 22:20:22	Int: 15m41s	d=4m37s 	
Yesterday 22:39:59	Int: 19m37s	d=4m27s 	
Yesterday 22:57:34	Int: 17m35s	d=4m20s 	
		     Turban: 19m09s

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GeyserLog 3.5.1


GeyserLog 3.5.1 is now available on the iOS AppStore.

Field testing of 3.5 found a number of minor issues which have been fixed:

  • The ending time picker for editing notes has been expanded to five lines, which will make it a bit easier to use.
  • Number of bursts can be entered in the Code variable, and displayed. Useful if Plume ever reactivates.
  • The Circle-O button allows filters to be created for non-Yellowstone areas.
  • Added missing Stopwatch button to Grand Wait
  • Added an action for Grand Wait view to manually update the previous Grand eruption time. Useful when the overnight electronic time is finally posted.
  • Fixed duplicate display of Turban ie before arrive in Grand Wait view.

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Observations for 2023 August 26


Wanted to go out to Grand last night, but rain started just about the time to head out. Looking at the weather maps, it looked like it wouldn't clear before the moon set, so stayed in.

That rain made it extemely humid, and there was a thick fog in the morning. It didn't help that at the time I didn't know when the previous Grand eruption had happened. Turned out I probably saw the first Turban eruption after Grand's first overflow. So ended up waiting two hours. After that, it was still fogged in, and dead calm when we got the One Burst Grand eruption. Afterwards, as I biked back in, the fog was starting to break at the south end of the basin.

2023-Aug-26:08:33:32 T1C

08:33:22	Turban		-0m10s
08:33:32	Grand B1	---	d=9m25s
08:36:09	Vent		2m36s
08:42:58	P1		9m25s
Vent & Turban continue

				     	ΣD=9m25s
	* * * * *
06:22:43			d=2m04s 	
06:43:06	Int: 20m23s	d=4m57s 	
07:03:05	Int: 19m59s	d=3m54s 	
07:21:39	Int: 18m34s	d=3m54s 	
07:38:22	Int: 16m43s	d=4m09s 	
07:57:21	Int: 18m59s	d=3m29s 	
08:14:17	Int: 16m56s	d=3m47s 
		     Turban: 19m04s

Was still not totally clear when Beehive erupted, but because it was calm, the water column was straight up, and only a portion of the walkway got wet.

There was another event at Fan & Mortar. As in the previous cases, Bottom Vent had a strong eruption, Main Vent was splashing, and Lower Mortar was also high. But while Fan's vents started strong, after a couple of minutes they'd died down well before Angle started.

The midday Grand eruption was a bit of a fiasco. I went out early because I had not much else to do. Almost immediately I caught a Turban eruption, one which lasted almost six minutes. That's usually the sign of a Turban Delay Interval, and when the next Turban interval had little Grand overflow, I was pretty sure of that.

Around the time of the second Turban eruption after that, I looked at a weather map and saw that there was a pretty strong thunderstorm headed our way. That's when the NPS radio had a severe weather alert, with one inch hail and 40 mph winds headed our way. Normally,with less information and with the way the sky looked, I'd have just hunkered down and waited the weather out. But the "one inch hail" part was enough to make me decide to clear out. I got into the trees between Liberty and Lion when the hail started, and decided that was a better place to experience hail than Geyser Hill. Turns out less than ten minutes later, the sky was clearing and the rain was mostly over. So much for the "severe weather."

I headed back to Grand, and arrived at about 22 minutes after the previous Turban eruption start. Grand was obviously in heavy overflow, and having another Turban Delay interval. Most of the people who had been waiting for Grand, gazers and tourists, had cleared out. At exactly 25 minutes, Turban started, followed almost immediately by the One Burst Grand Eruption.

2023-Aug-26:15:00:08 D3/D0/T1Q

15:00:05	Turban		-0m03
15:00:08	Grand B1	---	d=10m20s
15:00:10	Vent Ovfl	0m02s
15:03:01	Vent		2m53s
15:10:28	P1		10m20s
15:11:59	V&T Quit	11m51s

				     	ΣD=10m20s
	* * * * *
13:56:17			d=5m44s 	
14:14:21	Int: 18m04s	d=4m22s 	
14:35:05	Int: 20m44s	
		     Turban: 25m00s

There were clouds obscuring the moon as we went out to Grand. Once again, I saw what appeared to be a Turban Delay interval when I arrived. Fortunately, Grand erupted just two Turban eruptions later. Not only did we get a second burst after a fairly long first burst, but the moon was shining through a clear spot in the clouds.

2023-Aug-26:21:11:25 D2/T2Q

21:11:03	Turban		-0m22s
21:11:25	Grand B1	---	d=9m07s
21:20:32	P1		9m07s	d=0m48s
21:21:20	B2		9m55s	d=0m48s
21:22:08	P2		10m43s
21:23:07	V&T Quit	11m42s

				     ΣB=9m55s	ΣD=10m43s
	* * * * *
20:31:16			
20:49:36	Int: 18m20s	d=4m45s 	
		     Turban: 21m27s

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Observations for 2023 August 25


Not knowing when Grand erupted overnight, I went out at the twelve hour mark. Turned out that was a bit early, but I did get to see Castle have a major eruption after having a second minor eruption overnight. Grand also had an early Turban Delay interval. About 32 minutes in, I heard a boil or boop from Grand. It was another three minutes until Turban finally erupted, so a boop then fits the usual pattern.

On the second Turban interval, Grand's pool looked good enough to erupt, but didn't, and it took Grand two more Turban eruptions before we got the One Burst Grand eruption. Beehive also erupted during that wait.

2023-Aug-25:11:20:27 D4/T1Q

11:20:16	Turban		-0m10s
11:20:23	Vent Ovfl	-0m03s
11:20:27	Grand B1	---	d=10m49s
11:23:17	Vent		2m50s
11:31:16	P1		10m49s
11:32:19	V&T Quit	11m52s

				     	ΣD=10m49s
	* * * * *
09:33:50			
10:06:38	Int: 32m48s	d=5m46s  D0 Boop: 10:03:57	
10:25:10	Int: 18m32s	d=4m36s  D1	
10:44:22	Int: 19m12s	d=3m48s  D2	
11:01:57	Int: 17m35s	d=4m25s  D3	
		     Turban: 18m19s

For the afternoon Grand eruption there was finally no Turban Delay interval. Just a series of Turban eruptions. The interval was about one Turban Interval longer than expected, at just over 6-1/2 hours. Just before Grand did erupt I saw what I thought was Uncertain. It was hard to tell, as at first it was a thin, continuous water column about as high as an Uncertain eruption. Then the column was interrupted by pauses, and finally just quit without going into a mild steam phase. It was just Tardy having one of its weird Sawmill Group Deep Drain eruptions. It was hard to tell at first without landmarks (or tourists standing nearby) and because it just didn't look like Tardy.

The Grand eruption itself had an 8m20s first burst, nicely followed by a second. Grand's vent showed water for a third, but drained after about ten seconds. Was a bit surprised to see Vent & Turban continue.

2023-Aug-25:17:59:51 G2C

17:59:48	Boop		-0m02s
17:59:51	Grand B1	---	d=8m23s
18:00:40	Vent Ovfl	0m49s
18:00:45	Turban		0m54s
18:03:48	Vent		3m57s
18:08:14	P1		8m23s	d=0m40s
18:08:55	B2		9m04s	d=0m53s
18:09:49	P2		9m57s
Vent & Turban continue

				     ΣB=9m17s	ΣD=9m57s
	* * * * *
16:41:13			
16:57:18	Int: 16m05s	d=4m14s 	
17:18:03	Int: 20m45s	d=3m30s 	
17:38:29	Int: 20m26s	d=4m28s 
		      Grand: 21m22s

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Observations for 2023 August 24


Out to Grand on a foggy, damp morning. Only waited one Turban eruption interval, which turned into a Turban Delay eruption interval of 33-1/2 minutes. Because of the fog, it was hard to tell what the pool was doing after Turban started erupting. But a minute in, Turban was still powerful and vigorous, and the steam over Grand's pool seemed to have increased. So I wasn't surprised when after 1-1/2 minutes of Turban erupting, Grand started also. This was another long One Burst Grand eruption lasting almost 11-1/2 minutes.

2023-Aug-24:08:22:35 D0/T1Q

08:21:06	Turban		-1m29s
08:22:35	Grand B1	---	d=11m29s
08:24:48	Vent		2m13s
08:34:04	P1		11m29s
08:34:59	V&T Quit	12m24s

				     	ΣD=11m29s
	* * * * *
07:47:37			d=4m26s 	
		     Turban: 33m29s

With Little Squirt active yesterday, and nothing much else going on, decided to spend time on Geyser Hill over by Aurum. The vents were splashing around, but I don't know enough about it to know if we were close to an eruption. In any case, about a half hour later we got the call for Beehive's Indicator. I arrived at the benches just in time for Beehive to have a huge surge and being erupting. After the Beehive eruption, Lion had the second eruption of its series.

The midday Grand eruption was similar to this mornings, where once again Grand erupted after over 31 minutes of a Turban Delay interval. This time Grand started the eruption with an explosive burst as high as the trees, as seen from the benches. And once again, it was a long One Burst Eruption.

2023-Aug-24:14:46:47 D0/G1Q

14:46:47	Grand B1	---	d=11m04s
14:47:43	Turban		0m56s
14:48:52	Vent Ovfl	2m05s
14:50:16	Vent		3m29s
14:57:51	P1		11m04s
14:58:46	V&T Quit	11m59s

				     	ΣD=11m04s
	* * * * *
13:55:41			d=4m11s 	
14:15:45	Int: 20m04s	d=4m38s 	
		      Grand: 31m02s

Went out early for the next Grand, because it was the first nice sunset, with no wind or clouds, in quite a while. Ended up seeing another Turban Delay interval, this time at the 5-1/2 hour mark. But the One Burst Grand occurred only three Turban eruption intervals later, so the Grand interval was just over 6-1/2 hours. By then it was dark. Only four geyser gazers were there for the start, but the quarter moon gave plenty of light so no flashlights were used.

2023-Aug-24:21:25:44 D3/G1C

21:25:44	Grand B1	---	d=10m33s
21:36:17	P1		10m33s
Vent & Turban continue

				     	ΣD=10m33s
	* * * * *
19:55:23			
20:28:21	Int: 32m58s	d=5m28s  D0	
20:46:57	Int: 18m36s	d=4m48s  D1	
21:05:27	Int: 18m30s	d=4m01s  D2	
		      Grand: 20m17s

The last several minutes of the eruption were Big Sawmill mode, and just as Grand ended, Castle started. The minor eruption was over by the time I was packed up and walked over there. Not unexpected, as there have been several major Castle eruptions in a row.


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Observations for 2023 August 23


Rift had quit erupting by the time I got out to Grand. Not knowing the start or end time, but I suspect the eruption lasted less than three hours.

So it was a bit of a surprise when there was a Turban Delay interval just after the six hour mark. With no Grand eruption, that meant that the Grand interval would be the longer expected with Rift activity.

Six Turban eruptions later, there was a second Turban Delay interval. Fortunately, Grand had a One Burst Eruption about 31 minutes after the previous Turban eruption.

2023-Aug-23:12:37:59 D6/D0/T1Q

12:37:50	Turban		-0m09s
12:37:53	Vent Ovfl	-0m06s
12:37:59	Grand B1	---	d=11m28s
12:40:32	Vent		2m33s
12:49:27	P1		11m28s
12:49:47	V&T Quit	11m48s

				     	ΣD=11m28s
	* * * * *
10:01:13			d=3m18s 	
10:35:45	Int: 34m32s	d=4m26s  D0	
10:53:58	Int: 18m13s	d=4m19s  D1	
11:12:09	Int: 18m11s	d=3m30s  D2	
11:30:48	Int: 18m39s	d=3m52s  D3	
11:49:33	Int: 18m45s	d=3m51s  D4	
12:07:37	Int: 18m04s	d=3m34s  D5	
		     Turban: 30m13s

Afterward, Bulger was frequently rumbling, while Belgian and Crystal were both extremely low. Sawmill had been erupting for most of our Grand wait, but was now quiet, and Uncertain did not look like it would erupt.

Crystal Spring, 2023 August 23.

Afterwards, realized it had been 17 hours since we had seen Castle erupt last night. Turned out that Castle needed an additional half hour to finally erupt, and even then there were multiple pauses during the first five minutes. But it finally stopped pauseing and we had the second major eruption in a row.

Going out to Beehive after the Indicator call, we first saw Little Squirt in eruption, then the Lion eruption starting a series. Once again it was windy, but the wind didn't shift so only a portion of the boardwalk west of Plume got doused.

Went out for Grand expecting it near sunset. There was a series of undistinguished Turban eruptions, then Grand filled quickly and we got the One Burst Eruption on the last opportunity before sunset. This time the duration was less than ten minutes.

2023-Aug-23:19:31:52 G1C

19:31:51	Vent Ovfl	-0m01s
19:31:52	Grand B1	---	d=9m38s
19:34:59	Vent		3m06s
19:41:30	P1		9m38s
Vent & Turban continue

				     	ΣD=9m38s
	* * * * *
18:18:41			d=4m40s 
18:35:43	Int: 17m02s	d=3m57s 
18:55:01	Int: 19m18s	d=3m39s 
19:14:27	Int: 19m25s	d=3m55s 
		      Grand: 17m25s

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Observations for 2023 August 22


Got out to Grand at the 12-1/2 hours mark, and didn't have enough time to get set up before the eruption started. It was a two burst eruption, and once again, around the 40 second mark of the second burst Grand went into Big Sawmill mode where it looked like it was going to stop, but would keep thrashing around with jets and boils less than 10 meters high.

2023-Aug-22:06:28:24 G2*Q

06:28:24	Grand B1	---	d=8m58s
06:29:10	Turban		0m46s
06:31:45	Vent		3m21s
06:37:22	P1		8m58s	d=0m52s
06:38:15	B2		9m51s	d=2m27s
06:39:03	FP		10m39s
06:40:42	P2		12m18s
06:41:21	V&T Quit	12m57s

				     ΣB=11m25s	ΣD=12m18s

After breakfast, went out to see this morning's Castle minor eruption. It lasted about 5-1/2 minutes, and was already having pauses at the three minute mark.

The weather was heavily overcast, but with little rain forecast. Unfortunately, there were showers showing on the radar map headed our way. At around the six hour mark, Grand had a strong Turban Eruption Interval which caused the eruption to finally happen five Turban intervals later. Fortunately, the showers didn't really appear, although after yesterday I didn't take any chances.

Once again, Grand had a short first burst and a long second, where the second was long (this time by one second) and much of that time was in Big Sawmill mode. Not only that, but the whole eruption lasted less than ten minutes.

2023-Aug-22:14:09:28 D5/T2*Q

14:08:45	Turban		-0m43s
14:09:03	Vent Ovfl	-0m24s
14:09:16	Boop		-0m11s
14:09:28	Grand B1	---	d=7m56s
14:12:06	Vent		2m38s
14:17:25	P1		7m56s	d=0m34s
14:18:00	B2		8m31s	d=1m16s
14:19:08	FP		9m40s
14:19:16	P2		9m48s
14:20:19	V&T Quit	10m50s

				     ΣB=9m13s	ΣD=9m48s
	* * * * *
11:49:35			
12:08:48	Int: 19m13s	d=4m16s 	
12:41:34	Int: 32m46s	d=4m43s  D0	
12:58:30	Int: 16m56s	d=3m49s  D1	
13:16:22	Int: 17m52s	d=3m59s  D2	
13:34:28	Int: 18m06s	d=3m39s  D3	
13:51:36	Int: 17m08s	d=3m47s  D4	
		     Turban: 17m09s

Beehive finally erupted a few hours later. The wind by that time was steady and strong, so I decided that the railing near Plume would be save, and it was. The winds didn't shift during the eruption, so the only area that got wet were the two benches and the wide platform. Since Old Faithful erupted at the same time, the crowd for Beehive was small.

It took six Turban eruption intervals from arrival at sunset to the One Burst Grand eruption. During that time we got to see Daisy erupt, a magenta sunset, and Castle finally have its major eruption after this morning's minor eruption. Grand was a disappointment, as the duration was just under 9-3/4 minutes. A minute after the eruption ended Vent & Turban got quite powerful, then calmed back down.

2023-Aug-22:21:54:00 G1C

21:53:55	Boop		-0m04s
21:54:00	Grand B1	---	d=9m41s
22:03:41	P1		9m41s
Vent & Turban continue

				     	ΣD=9m41s
	* * * * *
19:57:19		
20:16:38	Int: 19m19s	d=4m32s 
20:35:36	Int: 18m58s	d=4m14s 
20:55:20	Int: 19m43s	d=4m03s 
21:13:10	Int: 17m50s	d=3m59s 
21:31:46	Int: 18m35s	d=3m46s 
		      Grand: 22m13s

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Observations for 2023 August 21


A much nicer day than yesterday, although did have to wait about an hour in the morning for the last of the showers to end. Out at Grand it quickly went from cool to calm, sunny, warm and humid.

Before going to Grand, I was able to catch a short Castle minor eruption. Grand had a nice steamy backlit two burst eruption where the pool actually held water for about ten seconds after that second burst. Once again Grand erupted at the first opportunity after the six hour mark, so I expect until the next Rift eruption to be out there on the short side of the interval.

2023-Aug-21:10:18:40 G2Q

10:18:37	Boop		-0m03s
10:18:40	Grand B1	---	d=8m47s
10:19:29	Turban		0m49s
10:20:50	Vent Ovfl	2m10s
10:21:52	Vent		3m12s
10:27:27	P1		8m47s	d=0m35s
10:28:02	B2		9m22s	d=0m58s
10:29:00	P2		10m20s
10:29:48	V&T Quit	11m08s

				     ΣB=9m45s	ΣD=10m20s
	* * * * *
09:03:37			
09:18:33	Int: 14m56s	d=4m39s 	
09:40:12	Int: 21m39s	d=4m49s 	
09:59:08	Int: 18m56s	d=4m37s 	
		      Grand: 19m32s

And of course, before completely packed up from the Grand eruption there is the radio call for Beehive's Indicator starting. Instead of treking to Geyser Hill, I decided to watch from Sawmill, which was in eruption.

There were still showers in the forecast when it was time to head out to Grand, but no rain right then. A hour later we got heavy winds, heavy rain and raisin sized hail between two Turban eruptions, and then another shower as Grand erupted.

The leadup to the Grand eruption was different. Right after the hailstorm there was a short Turban eruption interval, followed by an extremely short Turban eruption duration of just over 2-1/2 minutes. Then the Turban intervals got even shorter. Grand's pool was full within ten minutes, and the overflow could be heard as soon as eleven minutes after the Turban eruption.

Three Turban eruption intervals later Grand's pool was full and it slowly over the span of about five minutes built into waves and then some boops. It was so humid and steamy that I could not see any of the side activity. But the first burst ended after only 7-1/4 minutes. The pause was short, but the second burst ended up lasting about 2-3/4 minutes. After the first 50 seconds, it appeared as if the burst was going to end, and that was when we went into Big Sawmill mode for the rest of the eruption,

2023-Aug-21:17:55:00 G2*Q

17:54:57	Boop		-0m03s
17:55:00	Grand B1	---	d=7m15s
18:02:15	P1		7m15s	d=0m20s
18:02:35	B2		7m35s	d=2m42s
18:05:17	P2		10m17s
18:06:44	V&T Quit	11m44s

				     ΣB=9m57s	ΣD=10m17s
	* * * * *
15:42:47			
16:01:24	Int: 18m37s	d=3m52s 	
16:23:20	Int: 21m56s	d=4m31s 	
16:42:49	Int: 19m29s	d=4m14s 	
17:01:19	Int: 18m30s	d=2m39s 	
17:19:03	Int: 17m44s	d=3m14s 	
17:35:13	Int: 16m10s	d=4m01s 	
		      Grand: 19m47s

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Observations for 2023 August 19


A cool damp day that threatened to rain at any time. Out at Grand we saw a couple of Turban eruptions before we got a Turban Delay Interval. It was relatively short (28 minutes) and Grand's pool never looked like an eruption was emminent. Three Turban intervals later, the pool did look good. Turban started, and it took Grand nearly two minutes to finally erupt, from a pool that mostly filled after Turban had started. For the first time in days, Grand had a short first burst, but a second burst lasting 2-1/2 minutes.

2023-Aug-19:09:27:48 D3/T2*Q

09:26:07	Turban		-1m41s
09:27:48	Grand B1	---	d=8m13s
09:29:55	Vent		2m07s
09:36:01	P1		8m13s	d=0m41s
09:36:42	B2		8m54s	d=2m31s
09:39:13	P2		11m25s
09:39:53	V&T Quit	12m05s

				     ΣB=10m44s	ΣD=11m25s
	* * * * *
07:24:49			
07:44:12	Int: 19m23s	d=4m23s 	
08:03:48	Int: 19m36s	d=4m27s 	
08:31:52	Int: 28m04s	d=4m24s  D0	
08:48:28	Int: 16m36s	d=4m13s  D1	
09:07:53	Int: 19m25s	d=4m08s  D2	
		     Turban: 18m14s

Went out to Grand early in anticipation of rain. Turned out we got a few sprinkles during the wait, but far less than the forecast and weather radar would have indicated.

Once again Grand had a Turban Delay Interval on the first Turban eruption after I arrived. Three intervals later Grand had a strong fill, failed to erupt on a otherwise normal Turban interval. It was two more Turban intervals after that before we did get a Grand eruption that lasted just over ten minutes.

2023-Aug-19:16:46:17 G1C

16:46:11	Boop		-0m06s
16:46:17	Grand B1	---	d=10m06s
16:46:21	Vent Ovfl	0m04s
16:46:48	Turban		0m31s
16:49:23	Vent		3m06s
16:56:23	P1		10m06s
Vent & Turban continue

				     	ΣD=10m06s
	* * * * *
15:15:04			d=5m23s 	
15:33:02	Int: 17m58s	d=3m35s 
15:50:56	Int: 17m53s	d=3m44s 
16:10:00	Int: 19m03s	d=3m38s 
16:28:11	Int: 18m11s	d=3m46s 
		      Grand: 18m06s

All day Beehive was expected to erupt, but didn't. The eruption wasn't until nearly 19:00, for a 34 hour interval.


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Observations for 2023 August 18


The Lone Star trail head parking was closed due to masonry work and a need for repaving, so we had to park at the Keppler Falls parking.

Lone Star started erupting as we were tying up our bikes. So spent fifteen minutes there watching a nice dawn eruption.

The weather for the day was forecast to be unsettled, and it was. Sunny while we watched Lone Star, by the time we got to Grants Pass to fill up the water bottles, it was breezy and partly overcast. Fortunately, the mosquitoes were few, and our New Zealand sandfly repellent works well on them, too.

The bridge being constructed last summer was finished, and as typical of the NPS, it was a three-quarters assed job. The bridge ended about ten yards short, so one transitioned from a nice, steel bridge to slabs of left over planks crossing mud. Whoever planned the project seems to have assumed that a wet area next to bridge would not get worse in one year. Really detracted from the nice work done. (Similar problem at the bridge near site OA-2-- two of the side logs have fallen over the edge next to the new bridge there.)

Speaking of bridges, fording Shoshone Creek where there used to be bridges went well. As annoying as it is to have to take off and put shoes and sock back on, the icy cold water felt good on the feet for the next few hundred yards of hiking.

Arrived in the Shoshone basin to find someone reloading his pack while next to Soap Kettle. I reminded him that he was off trail out there. When he passed by us over in the trees by Minute Man a few minutes later, we wanted to argue that we were off trail too. I pointed out that at least we weren't messing around on the platform of an eruptive feature, which is the whole point of the closure.

As for Minute Man, it was quiet, and the pool well below overflow. As we waited for the rest of our party to arrive, the pool slowly filled and started overflowing. Over on the other side of the creek we were seeing Velvet erupt every ten or eleven minutes. Saw Shield and Gourd start up and then Minute Man started as I was wading across the river.

Was a strange, short period of activity for Minute Man, with about three or four eruptions in the series, then the level of the pool dropped and activity stopped for about another hour.

Over on the west side, spent a bit of time taking video of activity in Velvet, Lion, Small and aborted Knobby eruptions. Bead seemed uncooperative, but of course it erupted right after I returned back over to Minute Man, which was erupting in a full series by then.

Went through the Orion Group, where Union seems unchanged from previous visits. The water level is still well down, but it seemed like it hasn't gotten worse over the years.

To the north, I saw several splashes from Triple Bulger. It looked like #12, just downslope from Shield and Gourd (which were erupting again) had not had one of its floods in several hours, as the formations were dry where there wasn't direct overflow from the incoming waters. Five Crater seemed quiet, too.

The mosquitoes were out a bit more on the trail as we left, but I've experienced much worse. As we dropped down from the pass we heard some thunder in the distance, and felt a few drops, but that was the extent of the weather for the day. At Old Faithful, it appeared they had gotten a shower hard enough to leave puddles.

Walking back I realized that we would probably arrive just after twelve hours since we saw Lone Star. I expected we'd miss it by a bit. So was surprised that it was completely quiet, except for steaming and an occasional jet from a couple of the vents. The book listed eruptions, the last about ten minutes before we arrived, but they sounded like minors. So we waited there and after about half an hour, were rewarded by the second major eruption of the day. It appears that it must've had two minor eruptions preceding the that one, which considerably lengthened out the interval.

It was a pretty dull trip. I ended up not as worn out as I had expected.


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Observations for 2023 August 17


Sleeping in too long means going out to Grand and barely catching the early daylight eruption. Did get out early enough to see the Turban eruption where Grand didn't overflow, and then get the almost 12 minute One Burst Grand eruption.

2023-Aug-17:08:36:51 G1Q

08:36:45	Boop		-0m06s
08:36:51	Grand B1	---	d=11m50s
08:37:14	Vent Ovfl	0m23s
08:37:28	Turban		0m37s
08:40:09	Vent		3m18s
08:48:41	P1		11m50s
08:49:26	V&T Quit	12m35s

				     	ΣD=11m50s
	* * * * *
08:11:51			d=4m39s 	
		      Grand: 25m00s

Afterwards noticed that a number of the features in the Sawmill Group had water levels much higher than usual. So I got to see Oval Spring erupt to about 1/2 meter from a full pool, then drop about 30-50 cm afterwards. Spasmodic was high, but nowhere near overflow.

Down at Fan & Mortar there was some event activity, with Bottom Vent erupting enough to put water down to the river, multiple large splashes from Main Vent, and Lower Mortar high and vigorous. But nothing much came of it, other than the Fan vents showed a short resurgence just as everyone was about to leave.

In the afternoon there was another Turban Delay Interval followed by seven more intervals before we got the long One Burst Grand Eruption. This one featured multiple false pauses during the nearly twelve minute long eruption.

2023-Aug-17:16:55:45 D7/T1Q

16:54:58	Turban		-0m46s
16:55:15	Vent Ovfl	-0m29s
16:55:45	Grand B1	---	d=11m05s
16:58:12	Vent		2m26s
17:04:04	FP		8m18s
17:05:10	FP		9m25s
17:06:50	P1		11m05s
17:07:36	V&T Quit	11m50s

				     	ΣD=11m05s
	* * * * *
14:05:48			d=4m19s 	
14:24:00	Int: 18m11s	d=4m33s 
14:49:18	Int: 25m18s	d=5m29s  D0	
15:07:55	Int: 18m37s	d=3m38s  D1
15:27:06	Int: 19m10s	d=4m11s  D2
15:45:49	Int: 18m43s	d=4m00s  D3
16:03:57	Int: 18m08s	d=3m34s  D4
16:20:43	Int: 16m45s	d=3m04s  D5
16:37:44	Int: 17m01s	d=3m37s  D6
		     Turban: 17m13s

While walking away past Sawmill, there came the call for Beehive's Indicator, so made the side trip to Geyser Hill. Because of the wind direction, from the railing near the sign I was able to see a bright, double rainbow centered over Plume.


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Observations for 2023 August 16


When I saw that it had been over seven hours since the Grand eruption we were at last night, I went on out again. Waited a full Turban eruption interval and then got a steamy One Burst Grand that lasted less than 9-1/2 minutes.

2023-Aug-16:06:54:49 T1C

06:53:00	Turban		-1m49s
06:54:49	Grand B1	---	d=9m19s
06:56:53	Vent		2m04s
07:04:08	P1		9m19s
Vent & Turban continue

				     	ΣD=9m19s

With Beehive active before dawn, it seemed like a good Lower Basin day. Since nothing expected from Fountain for a few hours, rode the bikes out to Great Fountain.

Arrived there and the water level was high, but well below overflow. After an hour, and several White Dome eruptions, Great Fountain overflowed for a few minutes, the receded below the level it was at when we arrived. It was another 40 minutes before the real overflow began.

The overflow lasted 80 minutes, and up until the 70 minute mark, we had the place to ourselves. During most of that time White Dome was quiet. That's when two families arrived. The pause at the start of the eruptions lasted about 1-1/2 minutes. The action wasn't Great Flounder class, but was definitely nothing big or spectacular. There were a few nice bursts angled toward the benches.

We stayed until the end of the third burst. On the way back Pink Cone was in eruption, which was a nice bonus.

When I went out to Grand for the sunset eruption, there was so much overcast (and probably smoke) that the sky was mostly gray. West Triplet was just starting to overflow, which is the first time I've seen that since early in this visit.

After a couple of Turban eruptions, Grand started to behave as if there was going to be a Turban Interval Delay. At around the 23 minute mark the boops started, and lasted for a full minute. Some of the boops were several meters high and wide. The start of Grand's One Burst Eruption was weak, but it lasted almost 12-1/2 minutes with few slowdowns. It took over a minute for Turban to start erupting, and it was finished within seconds of the end of Grand's activity.

2023-Aug-16:19:37:21 G1Q

19:36:20	Boop		-1m01s
19:37:21	Grand B1	---	d=12m24s
19:38:26	Turban		1m05s
19:39:31	Vent Ovfl	2m10s
19:41:05	Vent		3m44s
19:49:45	P1		12m24s
19:49:57	V&T Quit	12m36s

				     	ΣD=12m24s
	* * * * *
18:53:58			d=4m35s 	
19:13:21	Int: 19m23s	d=4m36s 	
		      Grand: 24m00s

Posted on

Observations for 2023 August 15


Grand wasn't erupting as I biked past the Lodge. It was erupting as I approached the Inn. I turned around and let others enjoy the One Burst Eruption (and it was one) to go back to sleep for a while longer.

A few hours later, was expecting Beehive, but probably not soon. So intended to wait over by Aurum for the Indicator call. Waited less than ten minutes. Between the call and Beehive's eruption, also witnessed the second Lion eruption of the series, and a Plate eruption. I haven't seen Plate up from on Geyser Hill in a few years, and it seemed to me that the eruption was much larger than way back then. Beehive itself erupted in almost dead calm condition, with the spray and condensation settling on the walkway down by Plume.

For the next Grand we only had to wait for a few Turban eruption intervals before we got the Grand eruption a bit late in its early window. The first burst lasted almost 9-1/2 minutes, so it was a pleasant surprise to once again see a minute's worth of sloshing about in Grand's crater before we got the second burst. Despite the length of the eruption, over 11 minutes, Vent & Turban did not quit this time.

2023-Aug-15:12:51:06 G2C

12:51:06	Grand B1	---	d=9m26s
12:52:08	Turban		1m01s
12:54:31	Vent		3m24s
13:00:33	P1		9m26s	d=0m39s
13:01:12	B2		10m05s	d=0m56s
13:02:09	P2		11m02s
Vent & Turban continue

				     ΣB=10m23s	ΣD=11m02s
	* * * * *
11:52:14			d=5m34s 
12:11:20	Int: 19m06s	d=4m35s 
12:30:51	Int: 19m30s	d=4m32s 
		      Grand: 20m15s

For the next Grand wait, went out about three hours after the start of a Rift eruption. Did not expect or intend to be still out there four hours later.

When I arrived, I noticed a new sputtering hole, or at least one I didn't remember seeing previously. It is located about 1.5 meters from Sput D, directly on the line between Sput D and West Triplet. The vent is tiny, and the sputtering was only a few centimeters high. But it continued, along with Sput D's activity, as long as Rift was erupting. Until I can confirm that I didn't use the designation before, I'll refer to this as Sput G.

Sput G (in box) and Sput D erupting.

The second Turban eruption since my arrival was a Turban Delay Interval. From there, it took twelve more intervals before we finally got the One Burst Grand eruption. Rift itself ended after the fourth interval, for an approximate duration of five hours.

2023-Aug-15:22:39:31 D12/T1Q

22:38:35	Turban		-0m55s
22:39:31	Grand B1	---	d=10m25s
22:41:39	Vent		2m07s
22:48:58	FP		9m26s
22:49:56	P1		10m25s
22:50:52	V&T Quit	11m21s
22:59:52	V&T Restart	20m21s

				     	ΣD=10m25s
	* * * * *
18:30:09			
19:04:20	Int: 34m10s	d=4m17s  D0
19:21:01	Int: 16m41s	d=4m25s  D1
19:39:27	Int: 18m26s	d=3m49s  D2
19:59:08	Int: 19m40s	d=3m41s  D3
20:16:18	Int: 17m10s	d=3m51s  D4
20:35:37	Int: 19m19s	d=3m52s  D5
20:54:18	Int: 18m41s	d=3m35s  D6
21:11:28	Int: 17m10s	d=3m18s  D7	
21:28:37	Int: 17m08s	d=3m29s  D8
21:46:46	Int: 18m08s	d=3m33s  D9
22:04:23	Int: 17m37s	d=3m49s  D10
22:22:51	Int: 18m27s	d=3m21s  D11
		     Turban: 15m44s

Just before Grand erupted we got a little diversion. Ben Vanderley noticed that Bulger was erupting, and it was a major. In the dark, the gazers waiting for Grand ran down there, to the confusion of various visitors who were still waiting in the dark for Grand. Within a minute of Bulger starting, Bulger's Hole began erupting.

It was a strong eruption, with heights to about 4 meters at times. The activity slowed down twice as if the eruption was ending, then came back strong. There wasn't any sound effects from the Hole when it drained. The total duration of the eruption was about three minutes.

After Grand we hung around Bulger in case there was a second major and Bulger's Hole eruption, but after about 1/2 hour it was obvious that the one eruption was it. As we walked away, we noticed that Sawmill was quiet and Uncertain was steaming gently. It seemed obvious that in the dark we'd missed an eruption, about 20 minutes earlier, perhaps during an eruption of Old Tardy.


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Observations for 2023 August 14


In the morning there wasn't a Turban Delay Interval, just a series of non-descript Turban eruptions which finally led up to a One Burst Grand eruption. It seems like the start of the Grand window has shifted back about 45 minutes.

2023-Aug-14:09:24:41 G1Q

09:24:41	Grand B1	---	d=10m51s
09:25:42	Turban		1m01s
09:26:54	Vent Ovfl	2m13s
09:28:34	Vent		3m53s
09:35:32	P1		10m51s
09:36:24	V&T Quit	11m43s

				     	ΣD=10m51s
	* * * * *
08:20:02			d=4m10s 	
08:41:53	Int: 21m51s	d=4m32s 	
09:03:16	Int: 21m23s	d=4m32s 	
		      Grand: 21m25s

One the way back, saw something new and different. From Sawmill, we saw an ATV driving south toward Castle. The driver stopped there, got out and looked around for a while. Tried to get close enough to take some pictures, but he drove off before I could get close. I did see him drive up to the front of the Inn. I joked that it was probably someone claiming to use it because of a disability. The NPS was informed of this, and I heard that the Law Enforcement types wanted to find him, because they thought he might try driving down the Fountain Freight Road or Firehole Lake Drive. They did find an RV in the East Lot that had an empty trailer with the ramps down.

Found out late I wasn't far off. The person appeared at the Visitor Center to complain about disability access, and was told that he got to talk to Law Enforcement about how a licensed vehicle is not a mobility device.

Unrelated, but also from the radio-- doing 64 in the 25 zone at the West Entrance station will get you a mandatory visit to the magistrate in Mammoth.

Had time to kill, so went down to Fan & Mortar for a few hours. Everything was dry, and nothing happened for the first half hour I was there. Then there was the usual progression over the next half hour of vents starting and stopping. Twenty minutes after River had quit it was back on and another cycle started. This time the activity lasted about 20 minutes. After about ten minutes of no activity, I drifted away to catch Daisy.

The Daisy eruption was pretty much normal, with the usual duration of 3m20s.

In the afternoon at Grand, we got a short Turban Delay Interval of only 28 minutes. It was three Turban Intervals later that Grand erupted. The first burst lasted less than nine minutes, while the second was two seconds under the limit to be considered a Long Second. Even then, Grand toyed with us by having the crater start to refill before draining and Turban and Vent quitting.

2023-Aug-14:16:31:16 D3/G2Q

16:31:16	Grand B1	---	d=8m56s
16:31:53	Vent Ovfl	0m37s
16:32:05	Turban		0m49s
16:34:34	Vent		3m18s
16:40:12	P1		8m56s	d=0m42s
16:40:54	B2		9m38s	d=1m13s
16:42:07	P2		10m51s
16:43:06	V&T Quit	11m50s
16:51:53	V&T Restart	20m37s

				     ΣB=10m09s	ΣD=10m51s
	* * * * *
15:07:20			d=4m32s 	
15:35:15	Int: 27m55s	d=4m29s  D0	
15:52:02	Int: 16m47s	d=5m00s  D1	
16:11:40	Int: 19m38s	d=4m16s  D2	
		      Grand: 19m36s

Went out near sunset to catch Castle, expecting a minor since there was a major eruption after midnight. Instead we got a consecutive major eruption.

After dark we got out to Grand just in time to catch the Turban which started the Delay Interval. The overflow was heavy around the 20 minute mark, then decreased to almost nothing by 25. Then it picked up. By 28 minutes the overflow was heavy again. Just as Turban started, it sounded like there was a boil over Grand, and the One Burst Eruption started. It lasted almost 11 minutes.

2023-Aug-14:22:50:57 D0/T1Q

22:50:54	Turban		-0m03s
22:50:57	Grand B1	---	d=10m56s
22:53:27	Vent		2m30s
23:01:53	P1		10m56s
23:02:47	V&T Quit	11m50s

				     	ΣD=10m56s
	* * * * *
22:17:08			d=4m46s 	
		     Turban: 33m46s

Posted on

Observations for 2023 August 13


As expected, Grand reverted to the shorter, six hour long intervals. So when I woke up and saw it was already in eruption, I went back to sleep.

Did go out early for the next eruption of Grand. Another One Burst Grand eruption, but once again, the interval was at the short end of the range. Windy and cool, and multiple times people between West Triplet and Rift got soaked.

2023-Aug-13:12:23:16 G1Q

12:23:09	Boop		-0m07s
12:23:16	Grand B1	---	d=11m21s
12:23:19	Vent Ovfl	0m03s
12:23:35	Turban		0m19s
12:26:23	Vent		3m07s
12:34:37	P1		11m21s
12:35:34	V&T Quit	12m18s

				     	ΣD=11m21s
	* * * * *
11:23:14			d=5m45s 	
11:42:54	Int: 19m40s	d=4m35s 	
12:03:17	Int: 20m23s	d=4m39s 	
		      Grand: 19m59s

Just afterwards, was in the middle of lunch when heard the call for Beehive's Indicator starting to erupt. The wind hadn't changed much, so was able to stand along the railing and look up at the water column, which was cut off a bit by the same wind.

Went out again several hours before sunset, prepared to return in the dark. Both Grand and Castle were due during the same time period, but Castle had a short minor eruption shortly after I got to Grand. The series of ordinary Turban eruptions ended at the last eruption just before sunset. From my usual vantage point, with the wind from the north, this One Burst Grand eruption had a full rainbow extending from Vent to near Sawmill. One again the boardwalk (and people waiting there) from West Triplet to Rift got a soaking.

2023-Aug-13:19:49:03 T1C

19:48:05	Turban		-0m58s
19:48:25	Vent Ovfl	-0m38s
19:49:03	Grand B1	---	d=9m50s
19:51:33	Vent		2m30s
19:58:54	P1		9m50s
Vent & Turban continue

				     	ΣD=9m50s
	* * * * *
18:10:52			d=4m10s 
18:30:14	Int: 19m21s	d=4m17s 
18:49:58	Int: 19m44s	d=4m21s 
19:09:31	Int: 19m33s	d=4m06s 
19:29:51	Int: 20m19s	d=3m56s 
		     Turban: 18m14s

After the Grand eruption, with Lion still active, this meant there was a good possibility of some sort of eruption from North Goggles. Back in the cabin to refit for a wait in the dark, and then walked up on North Goggles minor eruption within a couple of minutes. Nice to see it before it got cold and was still light.


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Observations for 2023 August 12


Went out to Grand before midnight, and caught what was probably another Turban Delay Interval. That eruption of Turban lasted almost six minutes, while the next Turban eruption had no overflow from Grand. So the One Burst Eruption most likely occurred on the fourth Turban Interval after the Eruption Delay (D4).

2023-Aug-12:01:03:41 G1Q

01:03:41	Grand B1	---	d=11m58s
01:04:27	Turban		0m46s
01:07:03	Vent		3m22s
01:15:39	P1		11m58s
01:16:32	V&T Quit	12m51s

				     	ΣD=11m58s
	* * * * *
Yesterday 23:48:33			d=5m55s 	
00:07:05	Int: 18m32s	d=4m42s 	
00:26:31	Int: 19m26s	d=4m01s 	
00:44:31	Int: 18m00s	d=4m12s 	
		      Grand: 19m10s

Less of a wait for the Grand eruption at dawn. Arrived in time to experience another Turban Delay Interval, but fortunately, the One Burst Grand was the result.

2023-Aug-12:07:12:31 G1Q

07:12:31	Grand B1	---	d=11m19s
07:13:49	Turban		1m18s
07:14:50	Vent Ovfl	2m19s
07:16:16	Vent		3m45s
07:23:50	P1		11m19s
07:24:41	V&T Quit	12m10s

				     	ΣD=11m19s
	* * * * *
06:47:44			d=0m54s 	
		      Grand: 24m47s

Tried to visit the Lower Basin, but arrived at a nearly full Paint Pots parking lot at 09:00 to see Fountain in eruption. It was over by the time we walked out there. Based on an observation of Great Fountain the previous evening, we also decided to try biking out to it on another time.

The mid-day Grand turned into the afternoon Grand when another Turban Interval Delay took eight more Turban eruptions to recover. This eruption of Grand started with about 16 seconds of boops, including one shot up to 8 meters high, angled to the south. The start of the eruption itself was unimpressive, but fortunately, we got a second burst that was much higher. The second burst ended with a total eruption duration less than ten minutes, so it was disappointing when Grand's pool immediately drained with no attempt to refill.

Grand super-boop
2023-Aug-12:15:53:56 D8/G2C

15:53:39	Boop		-0m16s
15:53:56	Grand B1	---	d=8m27s
15:54:50	Turban		0m54s
15:55:10	Vent Ovfl	1m14s
15:57:06	Vent		3m10s
16:02:23	P1		8m27s	d=0m41s
16:03:05	B2		9m08s	d=0m41s
16:03:46	P2		9m50s
Vent & Turban continue

				     ΣB=9m08s	ΣD=9m50s
	* * * * *
12:40:13			
12:55:54	Int: 15m41s	d=4m21s 	
13:31:24	Int: 35m30s	d=5m11s  D0	
13:49:19	Int: 17m55s	d=4m21s  D1	
14:08:06	Int: 18m47s	d=3m50s  D2	
14:25:49	Int: 17m43s	d=3m42s  D3	
14:44:10	Int: 18m20s	d=3m36s  D4
15:02:17	Int: 18m06s	d=3m47s  D5
15:19:14	Int: 16m57s	d=3m21s  D6
15:36:20	Int: 17m06s	d=3m44s  D7	
		      Grand: 17m35s

There is at least one raven which has learned to clean up after the crowd at Grand disperses. Sometimes there's been a companion, but it usually starts at the northern runoff and works its way down the benches. So far it's kept its distance from people but I expect them to start checking bags and packs at some point.

If Grand had erupted on the next Turban eruption instead of the one in which it did, this would not have been a four Grand day. Instead the One Burst Grand eruption came five minutes before midnight. There wasn't any Turban Delay Interval, just a series of Turban eruptions where the duration and the intervals were getting shorter. At around the eight minute mark in the eruption, there was a false pause, and then Grand continued for almost another three minutes.

2023-Aug-12:23:55:02 G1Q

23:54:50	Turban		-0m12s
23:55:02	Grand B1	---	d=10m55s
23:57:31	Vent		2m29s
00:03:10	FP		8m07s
00:05:57	P1		10m55s
00:06:49	V&T Quit	11m47s

				     	ΣD=10m55s
	* * * * *
21:48:14			d=4m29s 	
22:07:55	Int: 19m41s	d=4m04s 	
22:26:59	Int: 19m04s	d=3m49s 	
22:45:49	Int: 18m50s	d=4m02s 	
23:03:16	Int: 17m27s	d=4m03s 	
23:20:44	Int: 17m28s	d=3m15s 
23:37:26	Int: 16m42s	d=3m34s 
		      Turban: 17m23s