Non veni pacem mittere, sed gladium.
I've seen rain like that in the very same place. Flash floods can be a problem. Patience and high ground is called for.
Love the desert. Just drove through Arches for the first time a couple weeks ago coming home from Colorado. Would love to spend some time there, but the whole Moab scene is a little too crowded for me.
You'd like Desert Solitaire by Edward Abbey. My favorite chapter: Tukuhnikivats, the Island in the Desert.
Moab became more of a tourist destination. May I recommend the Kokopelli Trail? It begins near Fruita, CO and ends up in Moab. I've done it several times and I have enjoyed the journeys. I have made the run in two days and I've made it in four. A lot depends on the various and sundry detours that you decide to make a long the way. I suggest that a three day plan for the Kokopelli is just about right.
Thanks for the Kokopelli suggestion. Love Abbey's writing, with the exception of the monkey wrench gang stuff. I forget the publication, but he's got a chapter describing a rental car fiasco in Australia that had me in stitches.