I'd heard of Darwin Falls in Death Valley but never been there on previous visits so decided this was the time.
Speedliter's Intensive! If you're going to be near those cities on those dates, I heartily recommend you register then call-in sick the day of. You'll be glad you did!
The cruising speed of a Boeing 737 is a shade over 500 miles per hour (all things being equal) so we'd traveled about eight miles closer to the cloud wall. Add to that the cloud wall was moving west, towards us and that yields the change in the cloud shapes between the two photo-sets.
The relatively short dusk duration is captured in this image with the yellows of the setting sun to the west and the darkening skies of night to the east.
As you can see, the ground in the camp was quite waterlogged, though this wasn't the worst camp site flood by quite some measure. See the image at the bottom of the post for the most waterlogged camp site!
As my faded memory recalls, pretty much every afternoon at around 3:00 pm, the clouds would build us and a series of thunder storms would roll through. The noise from the rain and thunder rendered our seismic recording an exercise in futility so we'd return to camp, and face the prospect of cooking once again.