Another cool and damp morning, but no wind. Got out to Grand in time to catch the Turban eruption prior to the Turban Delay Interval. Percolator was quiet, and I heard gurgling at depth in West Triplet, so I assumed that we were going to have to wait for West Triplet to recover from Rift erupting a few hours earlier. There was some rain, but nothing like yesterday.
That was the case, as it took Grand eight Turban intervals before I showed any inclination toward erupting. Percolator had been quiet for nearly three hours, but was active again just before the One Burst Grand eruption. West Triplet rose up and began to erupt shortly after Vent started. This eruption was short, at around 9-1/2 minutes, but too long for a second burst. There was some sloshing visible for about ten seconds, then a drained vent.
2026-May-31 : 09:16:24 D8/G1C 09:16:19 Boop -0m05s 09:16:24 B1 --- d=09m33s 09:17:00 Vent Ovfl 0m36s 09:17:15 Turban 0m51s 09:19:57 Vent 3m33s 09:25:57 P1 9m33s Vent & Turban continue ΣD=09m33s * * * * * 06:18:36 d=04m09s 06:50:02 Int: 31m26s d=04m32s D0 07:06:53 Int: 16m51s d=04m05s D1 07:26:27 Int: 19m34s d=03m22s D2 07:46:42 Int: 20m15s d=03m44s D3 08:06:07 Int: 19m25s d=03m53s D4 08:22:43 Int: 16m36s d=03m36s D5 08:41:33 Int: 18m50s d=03m37s D6 08:58:38 Int: 17m05s d=03m40s D7 09:21:46 West Triplet Grand: 17m46s
Over the last few days, with all the rains, I've noticed that the Firehole River has finally covered the Sawmill runoff channel shelf below the bridge.
Leaving the cabin, I was wondering if I was overdressed. By the time I got to Sawmill Group, I was wondering if I should've added another layer in the pack, just in case.
As it turned out, it didn't really matter. I saw Turban in eruption from the Castle bike rack, so spent a little time by Uncertain watching it not do much. I arrived at Grand just in time to see West Triplet start. The next Turban eruption was short, and the pool seemed especially low afterwards, making me think I might have see a Turban Delay Interval eruption from the bike rack.
Instead there was a steady fill in Grand's pool, and even though it seemed like we were about to get a definite Turban Delay Interval, Grand boiled up well before the deadline.
The burst wasn't very big, but there was enough wind to push the wind and steam away. With the duration under nine minutes, it wasn't certain there would be a second burst, but it was quite likely.
The pause was one of the shorter one, only 20 seconds. The burst was short. I jokingly said it was 105 feet, while Ben Vander Lay measured it at 103 feet. With the long second burst, it's almost like the pause was an extended version of the false pauses we see so often.
2026-May-31 : 15:40:59 T2*Q 15:40:36 Turban -0m23s 15:40:59 B1 --- d=08m29s 15:44:21 Vent 3m22s 15:49:28 P1 8m29s d=20s 15:49:48 B2 8m49s d=01m42s 15:51:30 P2 10m31s 15:52:14 V&T Quit 11m15s ΣB=10m11s ΣD=10m31s * * * * * 14:58:31 15:16:43 West Triplet 15:17:48 Int: 19m17s d=02m58s Turban: 22m48s
I waited around afterwards for the end of West Triplet, and a possible start of Rift. With the weather coming in, I left as soon as the first ended, and in because apparent that the steam wasn't getting stronger in the latter.
It really does seem that too often I am fine when Grand ends, and end up in the cabin drenched from the walk and bike ride back.
With the end of the rains, clearing skies and a full moon, had to at least try and see the next Grand eruption. West Triplet was in eruption when I arrived, and it seemed like Grand was pouring off a lot of water. Based on the Turban eruption duration and the next Turban interval, I would assume there was a Turban Delay interval.
Rift started shortly after, but it only erupted for about 45 minutes. Despite that, it took Grand three hours to finally have the One Burst Eruption. The start was nice and tall, and the eruption was well lit by the moon.
2026-Jun-01 : 00:42:45 T1C 00:42:00 Turban -0m45s 00:42:45 B1 --- d=09m21s 00:52:06 P1 9m21s Vent & Turban continue ΣD=09m21s * * * * * 21:40:23ie West Triplet d=42m05s 21:52:14 d=04m55s 22:10:07 Int: 17m53s d=04m08s 22:21:47 Rift 22:28:52 Int: 18m45s d=03m57s 22:49:01 Int: 20m09s d=03m27s 23:08:33 Int: 19m32s d=03m31s 23:29:23 Int: 20m50s d=03m38s 23:46:41 Int: 17m18s d=03m47s 00:05:56 Int: 19m15s d=03m17s 00:24:18 Int: 18m22s d=03m29s Turban: 17m42s