Observations for 2026 September 23


Last night I was expecting to be able to sleep in and head out late to Grand. Instead, it erupted just after midnight, so I went out into the dark, cold, and damp about six hours later. It got lighter, but breezy and gray and still cold.

Arrived in time to catch the start of West Triplet, and then the full interval leading up to a Turban Delay Interval. Fortunately, West Triplet ended without Rift starting, and the delay was only for three Turban eruption intervals.

The One Burst Grand was interesting only because it lasted for nearly eleven minutes, and Vent & Turban did not quit. At first I thought they had, then there was a resurgence from both geysers. Vent went into a loud roaring phase. I stuck around a little bit on the very off chance this could lead to an afterburst, but over the next few minutes Grand never showed any splashing.

2026-Sep-23 : 08:10:37 D3/T1C

 08:10:25	Turban	-0m12s
 08:10:37	B1	--- d=10m58s
 08:13:32	Vent	2m54s
 08:21:36	P1	10m58s
Vent & Turban continue

				     	ΣD=10m58s
	* * * * *
 06:42:25			d=04m18s	
 06:57:41	West Triplet d=32m41s
 07:12:52	Int: 30m27s	d=04m58s D0
 07:30:23	Int: 17m31s	d=03m28s D1
 07:48:07	Int: 17m43s	d=03m47s D2
		     Turban: 22m17s

In the afternoon, Grand waited for West Triplet to erupt. Kept us waiting through almost three hours of uninspired Turban eruptions. Over that time the Turban eruption intervals got shorter, until finally we got an early fill where the pool didn't drop. The lighting was nice, although the sun was low enough that rainbows were only visible when Grand and Vent were at their peaks.
The expected West Triplet eruption started during Grand's One Burst Eruption.

2026-Sep-23 : 17:24:31 G1C

 17:24:29	Boop	-0m02s
 17:24:31	B1	--- d=09m35s
 17:24:39	Vent Ovfl	0m08s
 17:25:00	Turban	0m29s
 17:27:44	Vent	3m13s
 17:34:06	P1	9m35s
Vent & Turban continue

				     	ΣD=09m35s
	* * * * *
 14:30:19			d=03m34s	
 14:51:27	Int: 21m08s	d=03m54s	
 15:11:18	Int: 19m51s	d=03m59s	
 15:31:06	Int: 19m48s	d=03m44s	
 15:51:01	Int: 19m55s	d=03m44s	
 16:10:06	Int: 19m05s	d=03m50s	
 16:29:35	Int: 19m29s	d=03m47s	
 16:48:13	Int: 18m38s	d=03m48s	
 17:06:23	Int: 18m10s	d=03m29s	
 17:31:31	West Triplet
		      Grand: 18m08s