Category: 2025

Went out in the dark to Grand near the nine hour mark. Walked up onto the end of an eruption of Rift. Water was still steaming away along the whole runoff channel. A little over an hour later there was a Turban Delay eruption interval.

During that Delay, Castle erupted with a minor eruption lasting less than three minutes. Finally five Turban eruption intervals later, right after eruptions of Daisy and Oblong. The One Burst Eruption lasted just over eleven minutes. Vent & Turban quit and restarted less than six minutes later.

2025-Aug-22 : 08:15:26 D5/T1Q

 08:15:01	Turban	-0m25s
 08:15:04	Vent Ovfl	-0m22s
 08:15:26	B1	--- d=11m01s
 08:17:22	Vent	1m56s
 08:26:27	P1	11m01s
 08:27:33	V&T Quit	12m07s
 08:33:30	V&T Restart	18m04s

				     	ΣD=11m01s
	* * * * *
 05:41:39			d=03m30s 	
 05:58:45	Int: 17m06s	d=03m31s 	
 06:17:14	Int: 18m29s	d=03m25s 	
 06:48:15	Int: 31m01s	d=03m38s  D0	
 07:05:14	Int: 16m59s	d=03m27s  D1	
 07:21:35	Int: 16m21s	d=03m25s  D2	
 07:36:50	Int: 15m15s	d=03m14s  D3	
 07:52:48	Int: 15m58s	d=03m13s  D4	
		     Turban: 22m13s

Went over to Geyser Hill to get a video of Slot Geyser erupting. After that success, waited a bit for the call for Beehive's Indicator to start erupting. Considered waiting near Plume for the possiblities for rainbows, but despite the dead calm, decided not to risk that location. A good move, as about halfway through the Beehive eruption that area got rained upon.

Did another wait for Grand's first overflow. Once again, that occurred nearly five hours after the previous eruption, and again during a Turban Delay eruption interval. This time the overflow came early in the interval, and by the twenty-five minute mark Grand's pool looked full, as it does before an eruption. Then it quickly dropped before Turban finally erupted for a 32 minute interval.

Grand 1st Ovfl_2025-Aug-22_1219
---------------
2025-Aug-22
12:15      Start Observations                    Other Event
12:22:55   >>>Eruption : d=05m04s                     Turban
12:40:49   >>>Eruption : d=04m04s                     Turban
12:58:10   >>>Eruption : d=03m53s                     Turban
13:02:03   End eruption                               Turban
13:09:13   1st ovfl                                    Grand
13:26:21   >>>Eruption                                 Daisy
13:30:01   >>>Eruption : d=05m13s                     Turban
13:35:14   End eruption                               Turban
13:36:47   Water ring visible                   West Triplet
13:37:22   End Observations                      Other Event

Since this was the non-Rift interval for Grand, went out a little early. There were a few unintersting Turban eruptions where the intervals got progessively shorter. Finally an interval under 17 minutes that had an explosive start by Turban. Grand took its time getting the One Burst Eruption started. As I've noticed with several other eruptions this trip, the pause before Vent & Turban restart was around six minutes. In the last few years, that has tended to be longer, well over 20 minutes long.

2025-Aug-22 : 17:29:52 T1Q

 17:28:43	Turban	-1m09s
 17:29:00	Vent Ovfl	-0m52s
 17:29:46	Boop	-0m06s
 17:29:52	B1	--- d=11m00s
 17:32:04	Vent	2m12s
 17:40:52	P1	11m00s
 17:41:54	V&T Quit	12m02s
 17:47:52	V&T Restart	18m00s

				     	ΣD=11m00s
	* * * * *
 16:17:20			d=03m55s 	
 16:36:07	Int: 18m47s	d=04m09s 	
 16:54:29	Int: 18m22s	d=03m40s 	
 17:12:26	Int: 17m57s	d=03m41s 	
 17:37:59	West Triplet
		     Turban: 16m17s

Went out to Grand based on a double interval, and got to see West Triplet in eruption from the bikerack (Seem to see a fair number of events from there.) Fifteen minutes later Rift joined in just as West Triplet quit.

That eruption lasted under two hours, and during that time Grand never looked like an eruption was possible. On the first Turban eruption after Rift ended, Grand had nice waves on the pool which ended just as Turban started. So not surprised that the next Turban eruption was similar to those of the previous two hours.

Well before the time the next Turban eruption was expected Grand started having strong waves. Grand booped for quite a bit before the One Burst Eruption finally started. That eruption lasted well over twelve minutes, with the last minute or two consisting of splashing intended to just prolong the wait for the end.

2025-Aug-21 : 11:47:15 G1Q

 11:47:09	Boop	-0m06s
 11:47:15	B1	--- d=12m16s
 11:47:18	Vent Ovfl	0m03s
 11:47:33	Turban	0m18s
 11:50:08	Vent	2m53s
 11:59:32	P1	12m16s
 12:00:14	V&T Quit	12m58s

				     	ΣD=12m16s
	* * * * *
 09:06:02			d=03m43s 	
 09:09:05	Rift d=01h52m 
 09:25:35	Int: 19m33s	d=03m46s 	
 09:45:15	Int: 19m40s	d=03m32s 	
 10:03:31	Int: 18m16s	
 10:21:29	Int: 17m58s	d=03m37s 	
 10:39:14	Int: 17m45s	d=03m58s 	
 10:57:47	Int: 18m33s	d=03m57s 	
 11:14:38	Int: 16m51s	d=03m24s 	
 11:31:02	Int: 16m24s	d=03m27s 	
		      Grand: 16m13s

For the first time in several years, I was accosted by a golden mantled ground tree rat looking for garbage. I guess the predators have easier picking elsewhere this year.

Finally got down basin beyond the Castle bikerack and caught a Daisy eruption. Looked typical and normal with a duration of 3m27s.

After that went out for another first overflow from Grand. This time it took place only 4h24m from the Grand eruption, but once again took place during a Turban Delay interval, one lasting 30m29s.

With another Rift eruption extremely unlikely, not sure what that overflow behavior could mean, so went out to Grand a bit earlier than necessary. Did get to see an eruption of Uncertain start just as I passed by Scalloped Spring. At Grand, West Triplet had visible water, and Percolator was quiet.

An hour later, West Triplet started erupting, lasting almost 34 minutes. The first Turban interval after the start of West Triplet had Grand showing the first attempt at an eruption with some nice low pool waves.

We got the One burst Grand eruption two Turban eruption intervals after West Triplet's eruption ended. Unlike this morning, this one burst eruption didn't reach ten minutes.

2025-Aug-21 : 20:38:36 G1C

 20:38:36	B1	--- d=09m42s
 20:39:20	Vent Ovfl	0m44s
 20:39:22	Turban	0m46s
 20:41:51	Vent	3m15s
 20:48:18	P1	9m42s
Vent & Turban continue

				     	ΣD=09m42s
	* * * * *
 15:49:03			d=03m43s
 16:11:59	Grand 1st ovfl		 4h24m
 16:19:32	Int: 30m29s	d=04m34s Delay
	* * * * *
 18:49:17			d=03m56s 	
 19:07:09	Int: 17m52s	d=03m40s 	
 19:26:02	Int: 18m53s	d=03m55s 	
 19:39:15	West Triplet d=33m55s 
 19:44:16	Int: 18m14s	d=03m53s 	
 20:02:25	Int: 18m09s	d=03m43s 	
 20:19:47	Int: 17m22s	d=03m41s 	
		      Grand: 18m49s

One thing I've noticed with the Rift eruptions the last few days is that Belgian Pool and Crystal Spring have low water levels before the eruption, but by the time Grand has erupted after Rift ends, they are both near their full levels. They then drop back down by the next time I see them, including the times I've gone out for first overflow about four hours later. This behavior is different from my experience with Rift in the past, where both would be at a high level when Rift starts, and be low afterwards.

It seemed to be calm for the pre-dawn eruption of Beehive, but there was just enough air movement to cause the spray to thoroughly wet down the walkway along the railing.

Decided the night before that there was no reason to get out to Grand before it got light. Didn't set an alarm, expecting to get out when I did wake up. Arrived out there at the 8-1/2 hour mark and found a full pool. Two Turban eruption intervals later, there was heavy overflow signaling that the eruption was about to start. The One Burst eruption at least lasted well over eleven minutes. By the end the tops of the highest jet were illuminated by the sunlight coming over the trees.

2025-Aug-20 : 07:03:57 G1Q

 07:03:57	B1	--- d=11m31s
 07:05:03	Turban	1m06s
 07:07:15	Vent	3m18s
 07:15:28	P1	11m31s
 07:15:49	V&T Quit	11m52s
 07:23:07	V&T Restart	19m10s

				     	ΣD=11m31s
	* * * * *
 06:31:23			d=03m25s 	
 06:48:24	Int: 17m01s	d=03m13s 	
		      Grand: 15m33s

Percolator was quiet the short time we were waiting out there, and during the Grand eruption West Triplet went from empty to starting to erupt shortly after Grand ended.

Went out again for Grand's first overflow. This time it took place at 4h35m, which is a bit more like what I'm used to seeing. But it also took place during a Turban Delay interval of nearly 32 minutes. Just after the previous Turban eruption the pool was extremely low, and by the 15 minute mark it appeared that first overflow was not going to happen that Turban interval. But because of the Delay, the pool kept on filling instead of the expected drop, and the overflow started a the 24 minute mark.

At that point the clouds to the west looked like rain, and I headed back in, just in case.

Went back out to Grand around the seven hour mark, with the weather radar map showing most of the showers were streaming past to the south and east. The Turban durations were short, between 3m15s and 2m30s. After an hour, West Triplet began to erupt. Twenty-four minutes in, Rift also began to erupt. West Triplet continued to erupt, finally ending with a duration of 54 minutes.

At about an 1-1/2 hours into the Rift eruption, Grand had a Turban Delay interval. Shortly after Turban ended, so did Rift.

The Delay ended up being only two Turban eruption intervals, and we got a One Burst Eruption which started after about 8-10 seconds of booping.

2025-Aug-20 : 17:25:19 D2/G1C

 17:25:11	Boop	-0m08s
 17:25:19	B1	--- d=10m39s
 17:25:46	Vent Ovfl	0m27s
 17:25:54	Turban	0m35s
 17:28:24	Vent	3m05s
 17:35:58	P1	10m39s
Vent & Turban continue

				     	ΣD=10m39s
	* * * * *
 10:52:26ie
 11:07:53	Int: 15m27s	d=3m51s
 11:31:53	Grand 1st ovfl		4h35m
 11:39:35	Int: 31m42s		Delay
	* * * * *
 14:10:07			d=03m12s 	
 14:27:49	Int: 17m42s	d=03m05s 	
 14:48:03	Int: 20m14s	d=02m53s 	
 14:56:51	West Triplet d=54m03s 
 15:07:16	Int: 19m13s	d=02m46s 	
 15:25:09	Int: 17m53s	d=03m10s 	
 15:31:11	Rift d=1h34m04s
 15:43:35	Int: 18m26s	d=03m21s 	
 16:03:12	Int: 19m37s	d=02m27s 	
 16:20:03	Int: 16m51s	d=02m42s 	
 16:51:16	Int: 31m13s	d=02m36s  D0	
 17:07:45	Int: 16m29s	d=02m33s  D1	
		      Grand: 17m34s

Went out later around sunset to Geyser Hill intending to record some videos, but Slot erupted just as I got to Giantess. That video will have to wait.

Decided to check on the status of Grand in order to try and figure out what happened over night. Around 07:00 saw that Grand's crater was empty with a vigorous Turban eruption in progress. Nothing from Vent, but West Triplet was completely dry and Percolator was splashing away. I put the eruption at at least two to two-and-a-half hours earlier.

Spent about an hour at Lion trying to catch the first of a series, but without success. Left with the intention of heading out to Grand based on the NPS prediction putting the eruption much earlier than my estimate. As I passed Heart Spring, I saw Beehive's Indicator in full eruption. So stuck around for a nice mid-morning eruption. Too late for rainbows, but there was no wind so the eruption did not get any part of the walkway wet and quite tall. Got back to the cabin just in time to hear a radio report of Grand in eruption, so no reason to head back out.

Shortly after that there was some entertaining radio traffic. It seems there was a family hanging around the boardwalk at Old Faithful in front of the Lodge with several dogs off leash. They were told that's not acceptable, by visitors and a Lodge employee. The response was that the dogs were well trained and didn't need leashes. So the employee contacted NPS Law Enforcement. It took them a while to arrive, and by that time the family could not be found. About fifteen minutes the family reappeared at the porch at the Lodge, and this time NPS-LE was there in a timely manner.

Within a few minutes came a radio call that there was "one being detained." Later, as the woman from British Columbia was being transported to Mammoth to her new accomodations I heard that she was charged with "interference". I thought I also heard at least one other person received a "mandatory appearance", but not for what. I'm hoping there's video posted on YouTube of this, to see how something can escalate so quickly. Also, this has a good chance of being her last visit to the US.

Finally did go out at around the four hour mark in order to check on the time of Grand's first overflow, and to hang around the Sawmill area. Sawmill was in eruption and a Deep Drain was in progress. It stopped shortly after I arrived, then a few minutes later erupted for about ten minutes. I never saw any splashing or heard any noise from Uncertain the whole time I was out there.

At Grand Percolator was in eruption, and Grand was well below overflow. The first overflow finally occurred at 4h53m, which is definitely longer than what's been seen. Percolator was in eruption for the whole hour I was out there, which is also different from what I've seen the last few years. And I saw a few seconds of splashing from Sput D at around the time of the first overflow.

While out there, I got to listen in on another person who received a complimentary trip to the Mammoth detention facility. This started as a satellite text report from the Fairy Falls parking area of a "road rage" resulting in one person pulling another from a car. Once again, when Law Enforcement arrived, they wasted little time in detaining someone. I may need to revive my logging of radio calls and posting them that I did a few years ago.

I figured it would be a long interval at Grand, but after missing one eruption I wasn't going to miss two in a row. Saw Turban from the bikerack, and then West Triplet in eruption as I walked toward Crested. I saw the West Triplet eruption end 24 minutes later, and then Rift start four minutes after that. It seemed like it took a long time for the Rift runoff to reach the boardwalk.

The Rift eruption lasted almost two hours, during which time Grand showed no signs of even trying to erupt. This state of affairs continued for another hour, until finally the intervals and durations started to get shorter. At the eleven hour mark in the Grand eruption interval Turban finally had a strong start to an eruption, but even then it took nearly a minute for Grand to join in.

The burst lasted just under 8-1/2 minutes and the second was just under a minute long. The whole eruption lasted just over ten minutes, and Vent & Turban quit. During the whole wait Percolator was in eruption, with some occasional activity by Sput D.

2025-Aug-19 : 21:51:56 T2Q

 21:51:08	Turban	-0m48s
 21:51:56	B1	--- d=08m24s
 21:54:10	Vent	2m14s
 22:00:20	P1	8m24s d=40s
 22:01:00	B2	9m04s d=56s
 22:01:56	P2	10m00s
 22:02:53	V&T Quit	10m57s

				     ΣB=09m20s	ΣD=10m00s
	* * * * *
 14:52:52			d=05m32s
 15:16:31	Int: 23m39s	d=03m58s
 15:33:32	Int: 17m01s	d=03m46s
 15:43:		Grand 1st Ovfl		4h53m
 15:51:32	Int: 18m00s	d=30m50s
	* * * * *
 17:35:47ie			
 17:38:02ie	West Triplet d=26m19s 
 17:54:21	Int: 18m34s	d=04m18s 	
 18:06:10	Rift d=1h57m13s
 18:14:53	Int: 20m32s	d=03m57s 	
 18:34:04	Int: 19m11s	d=03m55s 	
 18:52:57	Int: 18m53s	d=03m30s 	
 19:11:01	Int: 18m04s	d=03m39s 	
 19:29:39	Int: 18m38s	d=03m37s 	
 19:49:12	Int: 19m33s	d=03m29s 	
 20:08:03	Int: 18m51s	d=03m43s 	
 20:24:47	Int: 16m44s	d=03m02s 	
 20:42:43	Int: 17m56s	d=03m40s 	
 21:00:27	Int: 17m44s	d=03m29s 	
 21:18:06	Int: 17m39s	d=03m15s 	
 21:34:11	Int: 16m05s	d=02m54s 	
		     Turban: 16m57s

Did not expect to arrive in the Old Faithful area and find that Grand had not erupted since before we left home. Was pleasantly surprised to get checked in and partially unload the truck and see that a half hour later it still had not erupted, and interval approaching twelve hours. So suspended getting the cabin set up for a wait out at Grand. Didn't bring the light, as it needed to be unpacked first.

Only waited one Turban eruption interval of just over fourteen minutes. The pool filled nicely with Vent starting to overflow before the start of Turban's eruption. Then Grand took its time getting started with a series of large boops before the surging turned into jetting.

At just over 7-1/2 minutes, the burst was so short we pretty much had to get a second burst, which we did. The total eruption duration was just over nine minutes, and Grand didn't really make an effort for a third burst. Vent and Turban slowed down as if they were stopping, then resumed normal post eruption activity.

2025-Aug-18 : 18:06:43 T2C

 18:05:32	Vent Ovfl	-1m11s
 18:05:36	Turban	-1m07s
 18:06:34	Boop	-0m09s
 18:06:43	B1	--- d=07m39s
 18:08:23	Vent	1m40s
 18:14:22	P1	7m39s d=42s
 18:15:04	B2	8m21s d=45s
 18:15:49	P2	9m06s
Vent & Turban continue

				     ΣB=08m24s	ΣD=09m06s
	* * * * *
 17:51:19			d=03m23s 	
		     Turban: 14m17s