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Great Fountain Geyser, 2025
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Bears in Upper Basin, 2025 May 22
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Observations for 2025 June 14
With all the longer intervals recently, decided it was time to push back my Grand window, especially for nighttime activity. Went out at around the seven hour mark, just as the moon in a clear sky was rising above the ridge.
Still ended up waiting almost an hour for the One Burst Grand Eruption. There was a several second long False Pause at around the 8-1/2 minute mark, then the first burst continued for almost three more minutes.
2025-Jun-14 : 01:33:26 T1Q 01:33:13 Turban -0m13s 01:33:26 B1 --- d=11m15s 01:41:52 FP 8m26s 01:44:41 P1 11m15s 01:45:40 V&T Quit 12m14s ΣD=11m15s * * * * * 00:40:13 d=03m53s 00:58:26 Int: 18m13s d=03m29s 01:14:47 Int: 16m21s d=03m12s Turban: 18m26s
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Observations for 2025 June 13
It appeared that Rift erupted overnight, probably before midnight. Unlike yesterday, West Triplet did not eruption during the several hour wait at Grand, and never appeared to show wter in the vent.
Grand itself had a Turban Delay interval at our arrival. We finally got a One Burst Eruption two hours and six Turban eruptions later. The eruption was nicely backlit with what little wind pushing the steam to the north.
2025-Jun-13 : 09:26:11 D6/T1C 09:25:31 Turban -0m40s 09:25:39 Vent Ovfl -0m32s 09:26:06 Boop -0m05s 09:26:11 B1 --- d=10m06s 09:28:45 Vent 2m34s 09:36:17 P1 10m06s Vent & Turban continue ΣD=10m06s * * * * * 07:32:35 d=05m10s D0 07:50:58 Int: 18m23s d=04m28s D1 08:12:15 Int: 21m17s d=03m54s D2 08:33:57 Int: 21m42s d=03m50s D3 08:51:58 Int: 18m01s d=03m23s D4 09:08:20 Int: 16m22s d=03m35s D5 Turban: 17m11s
Afterwards went to investigate the progress on the boardwalk between Oblong and Giant. For a week, it seemed like nothing much, about 50 feet of new walkway. At least it looked like the new walkway is solidly built and won't immediately get bouncy like the old walkway.
The dumpster in front of Grotto was gone, replaced by one that gouged the paving material. Will be interested to see if there is any attempt to replair that damage.
Was surprised to see a second crew working on the Fan & Mortar walkway (the Oblong crew is on their weekend), where they were removing the old plastic walkway and replacing it with the newer boards.
Did a quick visit to East Sentinel, where it appears to be back to what I've considered its normal activity, with the murkiness gone.
In the afternoon it was a windy wait for Grand. Once again, I may have arrived during a Turban Eruption Delay. If so, this time it was six Turban eruption intervals before the One Burst Grand Eruption. We also got West Triplet ending just before the Grand eruption.
2025-Jun-13 : 17:31:19 T1Q 17:30:55 Vent Ovfl -0m24s 17:31:05 Turban -0m14s 17:31:08 Boop -0m11s 17:31:19 B1 --- d=10m22s 17:34:00 Vent 2m41s 17:41:41 P1 10m22s 17:42:54 V&T Quit 11m35s ΣD=10m22s * * * * * 15:41:38 d=05m25s 15:59:37 Int: 17m59s d=38s 16:18:37 Int: 19m00s d=03m41s 16:38:05 Int: 19m28s d=04m11s 16:56:26 West Triplet d=26m58s 16:57:02 Int: 18m57s d=03m27s 17:14:22 Int: 17m20s d=03m22s Turban: 16m43s
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Observations for 2025 June 12
The clouds of the day had cleared out by 22:30, so despite the experience of the morning, no reason to not to head out.
Might have arrived for a Turban Delay interval, because the overflow was strong and the next Turban eruption had no overflow prior.
If that was the case, then we only had a 3 Turban Delay before the One Burst Grand eruption. While the moonlight was clear and bright, I didn't see any moonbows while standing over by West Triplet.
2025-Jun-12 : 00:39:32 T1Q 00:38:39 Turban -0m53s 00:39:32 B1 --- d=09m17s 00:48:49 P1 9m17s 01:34:14 V&T Quit 54m42s Vent & Turban continue ΣD=09m17s * * * * * Yesterday 23:38:59 d=03m42s Yesterday 23:59:00 Int: 20m01s d=03m53s 00:17:38 Int: 18m38s d=03m43s Turban: 21m01s
It wasn't until we had left Grand that we realized that Castle was in eruption. Based on the fact that it was transitioning to steam as we walked up to it, the eruption started during Grand's eruption. This time we were able to catch moonbows with a slight hint of color in the spray and mist from the steam.
In the morning, I arrived just in time to catch another Turban Delay interval. West Triplet then erupted in the middle of a series of seven Turban eruptions leading to another One Burst Grand eruption.
2025-Jun-12 : 09:11:57 D7/T1C 09:11:31 Vent Ovfl -0m26s 09:11:38 Turban -0m19s 09:11:54 Boop -0m03s 09:11:57 B1 --- d=09m01s 09:14:26 Vent 2m29s 09:20:58 P1 9m01s Vent & Turban continue ΣD=09m01s * * * * * 07:08:10 d=05m06s D0 07:25:15 Int: 17m05s d=03m58s D1 07:43:14 Int: 17m59s d=04m18s D2 07:55:53 West Triplet d=30m02s 08:02:18 Int: 19m04s d=03m22s D3 08:19:41 Int: 17m23s d=03m31s D4 08:37:37 Int: 17m56s d=03m29s D5 08:55:30 Int: 17m53s d=03m41s D6 Turban: 16m08s
During the wait we saw an eruption of Oblong, and unlike most of the others that have been witnessed from there, it had a number of tall burst visible through the steam of the eruption.
With nothing much going in the Upper Basin, decided to try for a mid-afternoon Great Fountain eruption. Arrived at noon to find a low Great Fountain crater.
So took a side trip to check out the road damage at the bridges. It doesn't look good, and I'll be surprised if the road reopens any time soon, because the repairs are more like replace.
The Great Fountain overflow started about 1-1/2 hour later, lasting about 85 minutes. It was windy, so the best observations were from the boardwalk benches. There were some bursts with good height at the beginning, but the first burst sort of gradually turned into the second.
Got back into the Upper Basin where Grand had not erupted and the interval was over seven hours. From the bike rack I saw an eruption of Turban that was so large that at first I thought I was seeing Grand in the late Big Sawmill phase. But no jetting, so I knew that couldn't be it.
A half hour later West Triplet erupted, followed a few minutes later by the One Burst Grand eruption, lasting 9-1/2 minutes. West Triplet ended after that, with no Rift eruption.
2025-Jun-12 : 16:52:06 T1C 16:51:17 Turban -0m49s 16:51:33 Vent Ovfl -0m33s 16:51:57 Boop -0m09s 16:52:06 B1 --- d=09m33s 16:54:34 Vent 2m28s 17:01:39 P1 9m33s Vent & Turban continue ΣD=09m33s * * * * * 16:17:19 16:34:33 Int: 17m14s d=03m39s 16:46:57 West Triplet d=32m58s Turban: 16m44s
By then it was nearly 17 hours since we saw the Castle eruption, so decided to hang around. Over then next 1-1/2 hours the waiting crowd slowly got smaller as Castle was mostly silent with the occasional large splash. Needed time to fix a meal, so finally left around 19:00. Castle had the minor eruption about ten minutes later.
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Observations for 2025 June 11
The moon was bright and the sky clear when we went out for the after midnight Grand eruption. That situation slowly deteriorated, with high, thin clouds moving in and staying.
Got out just in time for a long wait for the first Turban eruption. That was preceded by heavy overflow and it was a strong Turban eruption. The next Turban eruption had no overflow, so the Delay count began.
A couple more Turban intervals and we got an eruption of West Triplet. That's when the Turban eruption intervals and durations began to vary in length, with little pattern. At one point there was heavy overflow and an interval under 24 minutes, Another time there was a short Turban eruption and an interval below 15 minutes.
By that time it was getting light and the moon had set. After a second West Triplet eruption, the fifteenth Turban eruption had an interval under 15 minutes, and a length under three minutes. Then we got a second Delay interval of over 32 minutes. It was two more short Turban intervals before Grand finally erupted. With a duration of just over nine minutes, that could've been the only burst, but at least our long wait got a second burst.
2025-Jun-11 : 08:37:00 D16/D3/T2*Q 08:36:35 Turban -0m25s 08:37:00 B1 --- d=09m05s 08:39:11 Vent 2m11s 08:46:05 P1 9m05s d=50s 08:46:55 B2 9m55s d=02m29s 08:49:24 P2 12m24s 08:49:35 V&T Quit 12m35s ΣB=11m34s ΣD=12m24s * * * * * 02:40:27 d=05m10s D0 02:57:09 Int: 16m42s d=03m43s D1 03:14:52 Int: 17m43s d=04m04s D2 03:21:16 West Triplet d=29m37s 03:33:59 Int: 19m07s d=03m53s D3 03:53:23 Int: 19m24s d=03m58s D4 04:11:09 Int: 17m46s d=03m38s D5 04:30:16 Int: 19m07s d=03m30s D6 04:49:05 Int: 18m49s d=03m44s D7 05:13:02 Int: 23m57s d=04m21s D8 05:30:35 Int: 17m33s d=03m38s D9 05:46:32 Int: 15m57s d=03m51s D10 06:03:28 Int: 16m56s d=03m08s D11 06:09:26 West Triplet d=33m48s 06:21:56 Int: 18m28s d=03m35s D12 06:39:12 Int: 17m16s d=03m22s D13 06:56:43 Int: 17m31s d=03m10s D14 07:11:14 Int: 14m31s d=02m58s D15 07:43:19 Int: 32m05s D16/D0 07:58:55 Int: 15m36s d=03m14s D16/D1 08:14:56 Int: 16m01s d=03m23s D16/D2 Turban: 21m39s
We started to feel raindrops on the way back from that eruption.
After an attempt at catching up on sleep, went out again for Grand. West Triplet was in eruption, and about twenty minutes after that Rift joined in. No Turban Delay intervals this time, but did have to set through about twenty minutes of rain and strong wind as a line of showers passed through. Then the rain stopped, although it was still cloudy with no sun.
An hour and a half into the Rift eruption Grand had a nice steady fill on a normal Turban eruption interval. Grand still took well over a minute to begin erupting, and this time the One Burst Eruption lasted 9-1/2 minutes. On the way back got to see a distant Beehive eruption from next to Sawmill. And once again, there was a hint of rain on the way back.
2025-Jun-11 : 16:11:43 T1C 16:10:22 Turban -1m21s 16:10:42 Vent Ovfl -1m01s 16:11:43 B1 --- d=09m30s 16:14:05 Vent 2m22s 16:21:13 P1 9m30s Vent & Turban continue ΣD=09m30s * * * * * 14:35:46 d=04m23s 14:47:50 Rift 14:54:47 Int: 19m01s d=04m06s 15:15:09 Int: 20m22s d=03m57s 15:34:44 Int: 19m35s d=03m18s 15:51:25 Int: 16m41s d=03m22s Turban: 18m57s
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Observations for 2025 June 10
Expected a Rift eruption overnight, did not expect to wake up at dawn and find that Grand had yet to erupt. It was around the nine hour mark, so I decided I could run out without much of a wait. Instead, the One Burst Grand Eruption started a few minutes later, so I need not head out.
A bit later I walked over to Geyser Hill and from there to check and confirm that Rift did erupt. Then back to Geyser Hill to wait a hour for Beehive. The winds, which had been mostly calm, picked up during the Indicator eruption, heading directly for the walkway. At first when Beehive started I retreated toward Scissors Spring, then decided it was better to run through the downpour and get behind the water column. I still ended up getting pretty wet, and it was a cool cloudy day.
Afterwards spent some time at Aurum, as it also was having what appeared to be a long interval. With multiple bison on Geyser Hill, I decided I'd rather not get trapped over there and went back to the cabin. (It was around this time that someone got knocked down by a bison over by the Inn. Later in the day it sounded like this bison charged a second touron.)
At Grand, we got a 35 minute Turban eruption interval. During this time the sky cleared and it started to feel much warmer. After that Delay, there followed three intervals later a second Delay Turban interval. At least this time Grand had the One Burst Eruption with the second Delay.
2025-Jun-10 : 13:07:15 D3/D0/T1Q 13:07:11 Boop -0m04s 13:07:12 Turban -0m03s 13:07:15 B1 --- d=11m05s 13:07:20 Vent Ovfl 0m05s 13:10:14 Vent 2m59s 13:18:20 P1 11m05s 13:19:19 V&T Quit 12m04s ΣD=11m05s * * * * * 11:15:12 11:28:52 Int: 13m40s d=03m51s 12:04:18 Int: 35m26s d=05m08s D0 12:23:13 Int: 18m55s d=04m20s D1 12:42:04 Int: 18m51s d=04m16s D2 Grand: 25m11s
During the afternoon it got cloudy and windy, but no rain. By the time of the evening Grand eruption the sky was clearing and the sun visible between the clouds.
During the afternoon it got cloudy and windy, but no rain. For a while it looked like it might clear up a bit, but by the time of the evening Grand eruption the sky was overcast and it was windy (the latter kept the mosquitos away).
The three Turban eruptions prior to the One Burst Grand eruption had durations of either 4m18s or 4m17s, but the intervals kept getting longer. The West Triplet started to erupt. The eruption started with an explosion on a Turban Delay interval under 26 minutes long. Vent & Turban looked like they might quit but after about 1m20s Turban's activity picked up. West Triplet stopped erupting at some point late in the Grand eruption.
2025-Jun-10 : 20:19:29 D0/G1C 20:19:25 Vent Ovfl -0m04s 20:19:29 B1 --- d=10m19s 20:19:31 Turban 0m02s 20:22:21 Vent 2m52s 20:29:48 P1 10m19s Vent & Turban continue ΣD=10m19s * * * * * 18:54:45 19:13:22 Int: 18m37s d=04m18s 19:33:25 Int: 20m03s d=04m18s 19:53:45 Int: 20m20s d=04m17s 19:59:30 West Triplet d=28m07s Grand: 25m44s
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Observations for 2025 June 09
Seeing Grand in eruption as I approached the Inn meant there was no reason to continue onward.
Noticed that Great Fountain had been seen nine hours previously, so it made sense to do an early morning trip out there. Arrived to find it in overflow. Fifty minutes later we got an adequate eruption, since it was still calm and the steam obscuring was at a minimum.
Grand could've erupted before noon, but instead we got a pair of Turban Delay intervals that pushed eruption into the same time frame that it's been in the last few days. At least we got a nice two burst eruption. It lasted ten minutes with Vent & Turban quitting after no attempt at a third burst. West Triplet finally erupted after Grand had ended.
2025-Jun-09 : 13:57:01 D3/D5/G2Q 13:57:01 B1 --- d=08m40s 13:57:24 Vent Ovfl 0m23s 13:57:42 Turban 0m41s 14:00:17 Vent 3m16s 14:05:41 P1 8m40s d=19s 14:06:00 B2 8m59s d=01m01s 14:07:01 P2 10m00s 14:08:12 V&T Quit 11m11s ΣB=09m41s ΣD=10m00s * * * * * 11:20:41 d=05m12s D0 11:38:18 Int: 17m37s d=04m29s D1 11:56:52 Int: 18m34s d=03m45s D2 12:28:05 Int: 31m13s d=04m43s D3/D0 12:45:27 Int: 17m22s d=03m07s D3/D1 13:03:12 Int: 17m45s d=04m03s D3/D2 13:20:46 Int: 17m34s d=03m27s D3/D3 13:39:03 Int: 18m17s d=03m32s D3/D4 Grand: 17m58s
The wind had picked up during the Grand wait, so there wasn't much expectation of height in the afteroon Beehive eruption. But it died down a bit, and people at the south end only had to retreat to a little pocket of dryness near Anemone.
Went out about an hour before sunset with a pack filled with all the gear needed for a long nighttime wait. Expected to see Rift in eruption, but it wasn't. Ended up never getting any of that gear out of the pack, as the One Burst Eruption started at the last opportunity to have the sun above the ridge. The eruption ended just as the sun disappeared. This was a fair trade-off-- sunset eruption instead of full moonlight eruption.
It seems that lately we are having Vent & Turban quit even on the relatively short one burst eruption, and this was yet another case.
2025-Jun-09 : 20:33:45 G1Q 20:33:45 B1 --- d=10m23s 20:33:55 Vent Ovfl 0m09s 20:34:07 Turban 0m22s 20:36:46 Vent 3m00s 20:44:09 P1 10m23s 20:45:09 V&T Quit 11m23s ΣD=10m23s * * * * * 19:54:46ie 20:13:35 Int: 18m49s d=04m09s Grand: 20m10s
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Observations for 2025 June 08
When I woke up at 05:30, I wasn't surprised to see that there wasn't a report for Grand in the last few hours. I was surprised to get out there just after 06:00 to find a full pool and West Triplet erupting. On over 8-1/4 hour interval, and Rift not to blame.
Before that, from the bike rack at Castle, I saw Penta in a fairly strong steam-phase eruption. By the time I got there the water in the runoff had almost reached the boardwalk. Was still going strong, so I recorded a couple of minutes of video.
West Triplet ended right after I arrived, so I expected the next Turban eruption would lead to Grand erupting too. Instead, got an hour's worth of Turban eruptions where the intervals were under 17 minutes. The One Burst Grand eruption finally started 66 seconds after Turban started.
2025-Jun-08 : 07:07:57 T1C 07:06:51 Turban -1m06s 07:07:57 B1 --- d=09m54s 07:10:10 Vent 2m13s 07:17:51 P1 9m54s Vent & Turban continue ΣD=09m54s * * * * * 06:06:13 West Triplet 06:16:40 d=04m22s 06:33:18 Int: 16m38s d=03m33s 06:49:49 Int: 16m31s d=03m34s Turban: 17m02s
In the Sawmill Group Uncertain was gurgling and splashing. After about 25 minutes of this, we finally got an Uncertain eruption of sorts. The start was not abrupt, but consisted of the splashing getting stronger and taller with more overflow until finally the weak jetting was continuous. The height was less than two meters, but around normal length, dying down to heavy steam. At that point, Sawmill had one of its half-minute eruptions where there wasn't any overflow.
Beehive was also having a long interval. I was there less than five minutes before water was visible in Beehive's Indicator. What little wind there was was blowing toward the river, so up by Plume we got a nice bright double half-rainbow.
Decided it was too nice to stay indoors, so went to try our luck in the Lower Basin. Got to the entrance to Firehole Lake Drive to discover that Great Fountain was already in eruption, so no point in biking out there. Continued on to Fountain Paint Pots to see quiet Fountain Group. Even Clepsydra was quiet. Didn't stick around there either.
Midday it was time for Rift. The Turban eruption interval after I arrived was at least 32 minutes long, so we also had a Turban Delay Interval to deal with. As it turned out, Rift ended first, after being active for almost two hours. Grand finally had the One Burst Eruption on the sixth Turban eruption interval, or one Turban interval after the end of Rift's eruption.
2025-Jun-08 : 15:07:11 D6/T1C 15:06:54 Vent Ovfl -0m17s 15:06:55 Turban -0m16s 15:07:03 Boop -0m08s 15:07:11 B1 --- d=10m00s 15:09:41 Vent 2m30s 15:17:11 P1 10m00s Vent & Turban continue ΣD=10m00s * * * * * 12:44:58 12:44:58ie Rift 13:16:13 Int: 31m15s d=05m01s D0 13:34:46 Int: 18m33s d=03m47s D1 13:52:34 Int: 17m48s d=03m52s D2 14:10:29 Int: 17m55s d=03m36s D3 14:30:21 Int: 19m52s d=03m37s D4 14:49:36 Int: 19m15s d=03m13s D5 Turban: 17m19s
Afterwards it was interesting that Belgian and Crystal, which had been low when I arrived, were now full. Crystal was even having its pulsation heavy overflows. Bulger, however, was only having minor eruptions, so an eruption of Bulger's Hole seemed unlikely.
By the time I arrived after sunset for the next Grand eruption, Belgian and Crystal had dropped considerably, from 15cm to 20cm. Sawmill was in eruption, but soon quit. Uncertain was showing water, acting like it was going to erupt, but then Sawmill had another eruption which lasted about a half hour. It wasn't until then that Uncertain finally erupted.
The wait for Grand was only 1-1/2 hours, a series of ordinary Turban eruptions and intervals. When Grand finally erupted, it was one of those starts where Turban erupts vigorously while Grand waits about a minute before starting. The One Burst Grand eruption by moonlight was quite nice, and it lasted eleven minutes.
2025-Jun-08 : 22:51:37 T1Q 22:50:42 Turban -0m55s 22:51:37 B1 --- d=11m01s 22:54:14 Vent 2m37s 23:00:58 FP 9m21s 23:02:38 P1 11m01s 23:03:30 V&T Quit 11m53s ΣD=11m01s * * * * * 20:58:54 d=04m51s 21:16:28 Int: 17m34s d=03m51s 21:35:54ie Int: 19m26s 21:54:19 Int: 18m25s d=03m55s 22:14:01 Int: 19m42s d=03m50s 22:32:02 Int: 18m01s d=04m19s Turban: 18m40s
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Observations for 2025 June 07
Grand is starting to get stuck in a mode where it erupts almost exactly three times a day, eight hours apart. Once again went out for the first eruption of the day just before sunrise. At least today there wasn't any ice on the boardwalks.
Castle was still putting out some noise at the end of a steamphase. Despite it being well over seven hours, Grand still hadn't erupted, thanks to the Rift eruption last night.
Only waited two quick Turban eruption intervals before the One Burst Grand eruption started. It lasted only 9-1/2 minutes and should've had another burst. What little breeze there was pushed the misty rain over the boardwalk from West Triplet on north.
2025-Jun-07 : 06:27:32 T1C 06:26:57 Turban -0m35s 06:27:32 B1 --- d=09m27s 06:30:25 Vent 2m53s 06:36:59 P1 9m27s Vent & Turban continue ΣD=09m27s * * * * * 05:50:20 d=03m50s 06:09:00 Int: 18m40s d=03m44s Turban: 17m57s
Afterwards, I noticed that Uncertain was splashing and gurgling heavily. A short wait gave me a short Sawmill eruption where the starting water level was out of sight. As soon as it ended, Uncertain started to overflow and burst up. It took a while for those burst to build in height to a full, normal eruption.
For the wait for the mid-day Grand eruption the Turban eruption intervals varied greatly, from over 22 minutes to barely over 16. Then West Triplet started to erupt and Grand followed before West Triplet ended. The first burst only had about ten seconds of Big Sawmill before Grand paused. The second burst lasted nearly a minute, and an eruption lasting just over ten minutes had Vent & Turban quitting.
2025-Jun-07 : 14:13:27 T2Q 14:12:59 Vent Ovfl -0m28s 14:13:02 Turban -0m25s 14:13:20 Boop -0m07s 14:13:27 B1 --- d=08m37s 14:16:03 Vent 2m36s 14:22:04 P1 8m37s d=38s 14:22:42 B2 9m15s d=55s 14:23:37 P2 10m10s 14:24:35 V&T Quit 11m08s 14:32:29 V&T Restart 19m02s ΣB=09m32s ΣD=10m10s * * * * * 12:18:59 d=05m00s 12:37:29 Int: 18m30s d=03m33s 12:59:41 Int: 22m12s d=03m41s 13:15:47 Int: 16m06s d=03m51s 13:35:05 Int: 19m18s d=03m55s 13:54:45 Int: 19m40s d=04m00s 13:58:28 West Triplet Turban: 18m17s
Before sunset Grand had the possibility of erupting before sunset, but it didn't happen. Instead we got a series of non-descript Turban eruptions, then a long West Triplet eruption. Grand did manage to have the One Burst Eruption right after the end of West Triplet. There was still a fair amount of light, and the moon, so it wasn't necessary to illuminate the eruption. It was still fairly warm, and the wind from earlier in the day had disappeared. The only drawback was that during the wait, we were subjected to an obnoxious family that only left two minutes before the Grand eruption.
2025-Jun-07 : 21:41:12 G1Q 21:41:12 B1 --- d=11m19s 21:42:10 Turban 0m58s 21:44:34 Vent 3m22s 21:52:31 P1 11m19s 21:53:18 V&T Quit 12m06s ΣD=11m19s * * * * * 20:08:25 d=05m14s 20:26:24 Int: 17m59s d=03m51s 20:44:56 Int: 18m32s d=04m00s 21:00:38 West Triplet d=35m23s 21:03:38 Int: 18m42s d=03m52s 21:21:53 Int: 18m15s d=03m38s Grand: 19m19s
We also got to see another 3-1/2 minute Castle minor during the wait.
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Observations for 2025 June 06
Went out to Grand expecting the next eruption to be in the dark. Did not expect it to be well after midnight.
At around the time I would have expected the eruption we got a strong, heavy overflow from Grand and the Turban eruption interval was 24-1/2 minutes. While not a Delay as defined, Grand and Turban acted as if it was for the rest of the wait. The durations on Turban eruptions got shorter as did the intervals. The final Turban eruption interval preceeding the explosive start of the One Burst Grand eruption was less than 14 minutes, and it took Turban over a minute to finally begin its eruption. The lighting by the moon, and the obscuring steam wasn't too bad, but not bright enough for us to seen any moonbows.
2025-Jun-06 : 00:21:43 T1Q 00:20:34 Turban -1m09s 00:21:43 B1 --- d=10m24s 00:23:44 Vent 2m01s 00:32:07 P1 10m24s 00:33:11 V&T Quit 11m28s ΣD=10m24s * * * * * ◀︎ 20:18:47 d=03m31s ◀︎ 20:38:20 Int: 19m33s d=04m04s ◀︎ 20:57:16 Int: 18m56s d=04m13s ◀︎ 21:18:04 Int: 20m48s d=03m44s ◀︎ 21:35:41 Int: 17m37s d=03m48s ◀︎ 21:55:08 Int: 19m27s d=03m52s ◀︎ 22:19:34 Int: 24m26s d=04m50s ◀︎ 22:36:13 Int: 16m39s d=04m02s ◀︎ 22:53:59 Int: 17m46s d=04m03s ◀︎ 22:59:39 West Triplet d=26m50s ◀︎ 23:12:26 Int: 18m27s d=03m23s ◀︎ 23:32:20 Int: 19m54s d=03m35s ◀︎ 23:49:17 Int: 16m57s d=03m15s 00:06:38 Int: 17m21s d=03m31s Turban: 13m56s
Came back out after dawn, and this time there was no wait for the One Burst Grand eruption. What little air movement was toward the south, although there was a steady rain mist coming down to the northern boardwalk were there was the view.
2025-Jun-06 : 07:23:51 G1Q 07:23:51 B1 --- d=11m16s 07:24:19 Vent Ovfl 0m28s 07:24:35 Turban 0m44s 07:27:26 Vent 3m35s 07:35:07 P1 11m16s 07:35:50 V&T Quit 11m59s 07:48:04 V&T Restart 24m13s ΣD=11m16s * * * * * 06:46:17 07:02:55 Int: 16m38s d=03m58s Grand: 20m56s
Checked out Economic before both eruptions. For the first, Economic was low, with the water level inside the inner rim and many of the runoff channels (especially the one under the boardwalk) showed no sign of being wet recently. For the second visit, Economic was in steady overflow and the under boardwalk runoff was wet.
Went down basin to take a look at the progress (or lack thereof) in rebuilding the boardwalk south of Giant. There old walkway has only been partly removed, and from a distance I could not seen any new sections. On the way back, I did manage to get a Rocket major eruption.
Like the morning eruption, we didn't have a long wait for the One Burst Grand eruption. An otherwise undistinguished eruption at midday with weather that was nicely sunny but a bit breezy at times.
After the Grand eruption, West Triplet started to erupt. As a Rift eruption is expected by midday tomorrow, I waited around for the end. It only lasted eight minutes, so no Rift eruption for at least a few more hours. Just before I left, Grand started having some small afterplay.
2025-Jun-06 : 14:10:43 G1Q 14:10:40 Boop -0m03s 14:10:43 B1 --- d=10m19s 14:11:23 Vent Ovfl 0m40s 14:11:40 Turban 0m57s 14:14:21 Vent 3m38s 14:21:02 P1 10m19s 14:22:33 V&T Quit 11m50s 14:30:42 V&T Restart 19m59s ΣD=10m19s * * * * * 13:31:44 d=05m15s 13:49:10 Int: 17m26s d=04m01s Grand: 21m33s
Was not surprised to see Rift in eruption when I came out for the next Grand eruption. Ended up waiting through a two hour series of Turban eruptions where the durations were short (around 3-1/2 minutes) while the intervals got shorter. Once they got around 16 minutes, I noticed that Rift was dying down. Half hour later, it quit as Grand started to erupt. We got a well lit two burst eruption where the durations were reasonable and ordinary.
2025-Jun-06 : 22:07:05 G2Q 22:07:05 B1 --- d=08m48s 22:07:08 Turban 0m03s 22:09:30 Vent 2m25s 22:15:53 P1 8m48s d=48s 22:16:41 B2 9m36s d=47s 22:17:28 P2 10m23s 22:18:15 V&T Quit 11m10s ΣB=09m35s ΣD=10m23s * * * * * 19:58:12 19:52:11 Rift ie 20:13:52 Int: 15m40s d=04m17s 20:33:01 Int: 19m09s d=03m41s 20:50:39 Int: 17m38s d=03m37s 21:08:27 Int: 17m48s d=03m24s 21:24:41 Int: 16m14s d=03m28s 21:44:31 Int: 19m50s d=03m29s Grand: 22m34s
Just before Grand, Beehive erupted. I watched it from the Sawmill Group.
It seems like every day over the radio I hear at least one report of a "thermal trespass" in the Biscuit Basin closure. I have yet to hear of anyone being cited for entering that closure. All that happens is that some or all of the group gets an identity check and a verbal warning. So if you are willing to risk the possibility of having a lifetime record in the national Dept. Of Interior "DOI-10 Incident Management, Analysis and Reporting System (IMARS)", you can get out there and look around and shoot your videos and selfies.
Plan ahead. Go out in the morning when the fog will help hide you. Go in from the Mystic Falls trailhead. Carry a radio that's tuned to the West Direct and West Repeater channels so you know when you've been spotted. Wear a bit of a disguise, in case you are seen. Something you would normally never wear, like a bright red MAGA ballcap, or a fluorescent orange jacket. Something that could easily be used as identification from a distance, and easily hidden when needed.
If you do get cited, have a lawyer ready so you can file a discrimination lawsuit. Just because you aren't a foreign tourist (frequent culprits) and despite your have spent years visiting this park, that doesn't mean you should not receive a verbal warning like everyone else. Enjoy!
I've been informed that 'coy' is an acronym from wildlife management jargon meaning "cub of year", a term that has escaped into the wild. I guess it's not surprising that a group that seems to enjoy using terms like "stall", or "crash", or "ernesto", or "delay" would readily adopt it.
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Observations for 2025 June 05
Arrived at the bike rack by Castle to find Rift in eruption. For the next 2-1/2 hours got a series of short duration and short interval Turban eruptions. When Grand finally did erupt, Rift was still in eruption. The first burst lasted long enough to be a One Burst Eruption, but not long enough to prevent a second burst. It turns out that after a 70 second wait, we were rewarded with an explosive start to a second burst.
2025-Jun-05 : 07:51:51 T2Q 07:51:28 Turban -0m23s 07:51:36 Vent Ovfl -0m15s 07:51:51 B1 --- d=09m18s 07:54:16 Vent 2m25s 08:01:09 P1 9m18s d=01m10s 08:02:19 B2 10m28s d=45s 08:03:04 P2 11m13s 08:03:54 V&T Quit 12m03s 08:11:38 V&T Restart 19m47s ΣB=10m03s ΣD=11m13s * * * * * 05:31:45 d=03m43s 05:49:59 Int: 18m14s -- Missed -- 06:27:02 d=03m23s 06:44:02 Int: 17m00s d=03m12s 07:00:11 Int: 16m09s d=02m45s 07:16:56 Int: 16m45s d=03m02s 07:32:41 Int: 15m45s d=02m53s Turban: 18m47s
Rift quit sometime during Grand's eruption, and Vent & Turban were only off for about six minutes before their restart.
Uncertain looked promising, but while it made a lot of noise gurgling, there wasn't much visible splashing, and after a half hour or so, the vent was mostly quiet.
Then it was time to go over to Geyser Hill to wait for Beehive. Not a long wait, and the wind ended up cooperating. At first it appeared that the railing was going to get inundated, but the wind shifted enough that by the end of the Beehive eruption, the wall of spray was crossing the river and forcing spectators over there to move.
After noon there was a nice short wait for a less than seven hour One Burst Grand eruption interval.
2025-Jun-05 : 14:31:36 G1Q 14:31:33 Boop -0m03s 14:31:36 B1 --- d=10m46s 14:31:39 Vent Ovfl 0m03s 14:31:44 Turban 0m08s 14:34:40 Vent 3m04s 14:42:22 P1 10m46s 14:43:10 V&T Quit 11m34s 15:02:27 V&T Restart 30m51s ΣD=10m46s * * * * * 13:48:33 14:07:04 Int: 18m31s d=04m10s Grand: 24m32s
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Observations for 2025 June 04
At first I thought the overnight Grand interval was ten hours, and I had no reason to head out. Then I woke up and redid the math, and decided a twelve hour interval was worth investigating.
I expected to walk up to a full pool, and I did. So much for seeing fog rising above the fog on the webcam. In any case, it was a Turban eruption interval later that we got a Delay that lasted over 33 minutes.
A quick check of Economic showed it to be well below overflow, at the level of the inner rim. There also weren't many puddles in the runoff, and the area beyond the boardwalk was dry.
But like last night, there was only a two Turban eruption interval delay, with the explosive Grand start actually visible due to a slight breeze from the north. Grand ended at exactly eight minutes, followed by a half-minute long pause before the second burst. At 1m07s, that burst wasn't long enough to constitute a Long Burst. About 45 seconds after the end of the second burst, it appears through the steam that Grand was full and starting to push out water. That's when the activty of Turban and Vent picked up, with Vent blasting away. No third burst, and a less than ten minute long Grand eruption ended with Vent & Turban quitting.
2025-Jun-04 : 07:37:21 D2/G2Q 07:37:21 B1 --- d=08m00s 07:37:51 Vent Ovfl 0m30s 07:38:09 Turban 0m48s 07:40:50 Vent 3m29s 07:45:21 P1 8m00s d=34s 07:45:55 B2 8m34s d=01m07s 07:47:02 P2 9m41s 07:48:40 V&T Quit 11m19s ΣB=09m07s ΣD=09m41s * * * * * 06:23:55 d=04m15s 06:58:18 Int: 34m23s d=05m25s D0 07:15:26 Int: 17m08s d=04m21s D1 Grand: 21m55s
Decided that since there wasn't much going on, and it was early, that this might be a good time to go to Fountain Paint Pots and maybe seen an eruption, or at least take a look at the vista enhanced overlook.
There were some periodic Jet eruptions after our arrival, and a half hour later Morning's Thief erupted. I always remembered it as being tall and narrow. This eruption was tall and wide, with much overlap of Morning's pool.
Fourteen minutes later Fountain finally erupted, with two more of the wide and tall Morning's Thief eruptions. Fountain lasted only 28-1/2 minutes. I tried to take video of the whole eruption from the first Morning's Thief, but the wind was directly toward the overlook. And it was cold so there was plenty of steam. Now that it actually is an overlook, will have to try again under better conditions.
In the afternoon we watch ten eruptions of Turban before we finally got a One Burst Grand Eruption. Every one of those was similar to the preceeding, the only change was that the intervals between Turban eruptions got shorter. After the sixth Turban eruption, West Triplet started to erupt. This is the first time I've seen West Triplet have a normal erupion lasting about 1/2 hour that wasn't associated with eruptions of Grand or Rift. At least the One Burst Grand eruption lasted over 11 minutes.
2025-Jun-04 : 16:21:22 G1Q 16:21:14 Vent Ovfl -0m08s 16:21:20 Boop -0m02s 16:21:22 B1 --- d=11m19s 16:21:23 Turban 0m01s 16:24:05 Vent 2m43s 16:32:41 P1 11m19s 16:33:41 V&T Quit 12m19s ΣD=11m19s * * * * * 13:20:11 d=04m28s 13:40:25 Int: 20m14s d=04m15s 13:59:16 Int: 18m51s d=04m00s 14:18:28 Int: 19m12s d=04m06s 14:37:37 Int: 19m09s d=03m44s 14:55:52 Int: 18m15s d=03m22s 14:56:09 West Triplet d=27m03s 15:11:56 Int: 16m04s d=03m29s 15:30:04 Int: 18m08s d=03m43s 15:48:02 Int: 17m58s d=03m39s 16:05:14 Int: 17m12s d=03m26s Grand: 16m08s
After that, it was time to have dinner. And after dinner, Beehive erupted. The wind cooperated and no one on the walkway got wet.
The sky was clear and the moon was beyond the first quarter, with the temperature already in the upper 30s. But only had to wait a couple of Turban eruption intervals before the Grand One Burst Eruption started. Once again, it was a short eruption, at 8m41s, and there was no attempt at a second burst.
2025-Jun-04 : 23:05:10 G1C 23:05:10 B1 --- d=08m41s 22:06:05 Turban 0m55s 23:08:55 Vent 3m45s 23:13:51 P1 8m41s Vent & Turban continue ΣD=08m41s * * * * * 22:23:14 d=04m26s 22:43:40 Int: 20m26s d=04m14s Grand: 21m30s
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Observations for 2025 June 03
Thanks to an observation in the middle of the night, could sleep in a little longer before going out for the morning Grand eruption. The sky was much clearer than expected, but cold and windy. And still ended up waiting two hours. We finally got a two burst eruption from Grand. After the second burst ended at just over nine minutes, I thought a third burst was guaranteed. The vent drained and made no attempt to refill.
2025-Jun-03 : 09:35:04 T2C 09:33:56 Turban -1m08s 09:34:17 Vent Ovfl -0m47s 09:35:04 B1 --- d=08m04s 09:37:25 Vent 2m21s 09:43:08 P1 8m04s d=21s 09:43:29 B2 8m25s d=37s 09:44:06 P2 9m02s Vent & Turban continue ΣB=08m41s ΣD=09m02s * * * * * 07:43:46 d=05m21s 08:02:12 Int: 18m26s d=03m38s 08:21:19 Int: 19m07s d=03m43s 08:39:04 Int: 17m45s d=03m51s 08:57:11 Int: 18m07s d=03m34s 09:15:45 Int: 18m34s d=03m46s Turban: 18m11s
It was a day to get some housekeeping chores out of the way, but fortunately the call for Beehive's Indicator came during a lull. Over on Geyser Hill it was still cold and windy, and that wind kept shifting enough to require the deployment of the umbrella on a couple of occasions.
Later, I got to see Rift in eruption as I arrived at the Castle bike rack. West Triplet was drained by the time I arrived. Instead of the long wait, after a half hour Grand had a Turban Delay Interval of just over 30 minutes. With Rift (and Percolator) still erupting, we got a One Burst Grand eruption that lasted 45 seconds longer than the morning's eruption.
2025-Jun-03 : 16:59:25 D0/T1C 16:58:41 Turban -0m44s 16:58:58 Vent Ovfl -0m27s 16:59:21 Boop -0m04s 16:59:25 B1 --- d=09m46s 17:01:48 Vent 2m23s 17:09:11 P1 9m46s Vent & Turban continue ΣD=09m46s * * * * * 15:17:44ie Rift 15:29:13 d=03m02s 15:49:39 Int: 20m26s d=03m53s 16:08:38 Int: 18m59s d=03m13s 16:28:00 Int: 19m22s d=03m30s Turban: 30m41s
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Observations for 2025 June 02
After a night where any sort of aurora failed to appear, we were rudely awaken by the radio call for the start of Beehive's Indicator. Made it out in plenty of time, and didn't need the umbrella this time.
Afterwards, not knowing the time of the overnight Grand eruption, I decided to head out at the twelve hour mark. Then I heard another radio report of the bear and cub in the Daisy Group. That quickly changed to near Castle. I decided today would be a good day to be on foot, in case the NPS decided to shut an area down and I ended up separated from my bike.
Got to Grand just in time of the start of Turban. I'd arrived so early that shortly after I was able to see Grand's first overflow, with the water suddenly creeping down the dry runoff channels. That's when I learned that the overnight time had been posted. Seems that First Overflow time hasn't changed much over the years. This one was 4h17m, and I'd always worked off of 4h20m.
At the same time, Belgian and Crystal were both still extremely low.
What was interesting was that the Turban interval following was over 30 minutes long. One hypothesis I've had is that almost every Grand eruption has a Turban Delay Interval, it's just that we don't seem a lot of them because they come between First Overflow and the opening of the eruption window, when people finally start observing Grand.
In any case, I headed on down basin to check out Economic. It was in overflow, but not as strong as what was seen last night. Onward to Giant. The flowers growing in front of Bijou and Catfish are out in force, and a good sign nothing much has happened there.
Then did the loop around Daisy, which had erupted as I approached Oblong. On the boardwalk next to the swamp beyond Splendid, I found a long line of muddy little bear footprints. All the way to the junction.
Being a Monday, I realized that I needed to head back to Grand before the boardwalk construction crew arrived at 10:00. Got back just in time, as the guy putting up the closure signs appeared at Chromatic at 10:10.
On the way back, noticed that Economic seemed unchanged.
The wait for the One Burst Grand eruption only an hour, with no Turban Delay Intervals. It lasted over eleven minutes, and was followed by a six minute pause in Vent & Turban's activity. West Triplet also started thumping and splashing following Grand.
2025-Jun-02 : 11:15:42 G1Q 11:15:36 Boop -0m06s 11:15:42 B1 --- d=11m04s 11:16:17 Vent Ovfl 0m35s 11:16:33 Turban 0m51s 11:19:21 Vent 3m39s 11:26:46 P1 11m04s 11:27:57 V&T Quit 12m15s 11:34:18 V&T Restart 18m36s ΣD=11m04s * * * * * 08:21:38 d=02m58s 08:31 Grand 1st Ovfl 08:55:23 Int: 33m45s d=04m16s Delay -- Missed -- 09:55:15 d=04m04s 10:16:51 Int: 21m36s d=04m24s 10:35:06 Int: 18m15s d=03m57s 10:55:20 Int: 20m14s d=03m43s Grand: 20m22s
While waiting for Grand, I was surprised to see Uncertain erupt. All of us waiting there saw the narrow water column, but afterwards Uncertain did not exhibit its usual post-eruption gentle steaming. Instead it was splashing as if it hadn't erupted. It had quieted down a bit by the time I left the area after Grand.
Down at Grotto the boardwalk crew swapped out dumpsters. As usual with the NPS, the esthetics of the placement has a lot to be desired.
Then spent 1-1/2 hours at Fan & Mortar watching what appeared to be a real cycle of activity. Started out near the end, with all the vents of Fan erupting weakly. They then stopped for a while, until I notice Bottom Mortar splashing at depth. This got stronger and then Fan's River vent started. Shortly after, High started and looked quite strong-- 2-3 meters high with Gold also joining in strong. That didn't last long, maybe a minute at most, then the activity subsided. When I left, it looked a lot like how it did when I arrived.
A quick check of East Sentinel showed no change in appearance from yesterday.
At Grand there was an hour wait under cold and blustery gray skies for an undistinguished One Burst Eruption that lasted just over nine minutes, which made no attempt at a second burst.
2025-Jun-02 : 17:59:34 G1C 17:59:27 Vent Ovfl -0m07s 17:59:29 Boop -0m05s 17:59:34 B1 --- d=09m11s 17:59:37 Turban 0m03s 18:02:35 Vent 3m01s 18:08:45 P1 9m11s Vent & Turban continue ΣD=09m11s * * * * * 16:59:17 17:18:48 Int: 19m31s d=03m50s 17:38:46 Int: 19m58s d=03m53s Grand: 20m48s
It was almost dark when the radio call for the start of Beehive's Indicator went out. It included a request for a flashlight. It was still bright enough that the water column could be observed, but we lit it up anyhow. Fortunately, despite it being a windy day, there was no wind during Beehive's eruption, with the water column going straight up and the spray dropping straight down. As we left, the wind picked back up.
("Coy"? Or is it spelled "koi"? Obviously some petty apparatchik decided that someone else, at some time in the future, could potentially be offended by calling a newborn bear a "cub" and that needed to be rectified immediately. Renaming well established things is an offensively obnoxious and stupid exercise of raw power, whether it is unilaterally renaming "Mt. Doane" to "First Peoples Mountain", the "Gulf of Mexico" to "Gulf of America", or changing "cub" to "coy". The online dictionaries don't seem to have caught up with this particular neologism, either.)