Came out after midnight for another three hour wait. At least this time there was a second burst, which made the wait not seem so bad.
One thing the long interval did do was separate the Fountain/Morning window from the Grand window. There was little chance of overlap, and with the first being at dawn, all it would cost me would be a few hours sleep. For some reason I decided to go out and try my luck. I got a Fountain eruption, and headed back before the roads became the usual mess I try to avoid. It also confirmed my suspicions that Morning's next interval was going to be back in the 5 to 7 day range.
When Grand has had long intervals, there appears to be little reason for it. The mid day wait didn't even have Rift to provide an excuse.
Despite the longer intervals , have been going out early for Grand, as it seems like it could have shorter intervals. This time it worked.
The pool looked good when I got there, and kept rising. Then stayed at heavy overflow for about ten minutes before receding. There were never any waves, and with the low lighting, they would have been easy to see. I did not see the previous Turban, but the elapsed time implied an interval close to thirty minutes when Turban finally did erupt. And then Grand started to refill. There was heavy convection visible around the vent and then waves started. About a minute after Turban started, Vent began to overflow, and Grand had small boils over the vent before finally erupting.