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Observations for 2025 August 19


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

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Observations for 2025 August 18


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

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GeyserLog 4.1


GeyserLog 4.1 is available on the iOS AppStore.

Functionality remains the same, but much of GeyserLog has been rewritten to use newer features of iOS such as SwiftUI, Swift Concurrency and better networking.

  • Logbook List replaces the old Logbook view and the Recents list. It allows for display by name or event time over a selectable period of time. Filtering by groups and features is supported. Events use color coding and icons to differentiate between eruptions, notes, webcam and SMS entries, and your own submissions, along with icons to denote comments, confirms, and attachments.
  • In the Logbook, when a note is later than the latest eruption event, both will be shown.
  • Formatting of messages for Satellite SMS (requires registering your phone number with the GeyserTimes website.)
  • The Predictions view will now include the Apple Weather for the same period of time.
  • Predictions within an event panel will use the same color bar format, along with a display of the window. The feature name will also be highlighted with the color bar value if applicable.
  • Notebook Pages allow the gathering of notes and event times that don't need to be submitted to GeyserTimes. It's still a work in progress, and the views will probably change as field testing progresses. Also, it's not guaranteed to not lose data, so use with caution and please report any failures or problems.