Boy, those are familiar looking sights. The ones you drove by near Sweetwater are near my home. The big windfarm you drove by near Post on that big mesa is a place where we have Texas State Enduro Circuit races. Funny you mention an impending storm in the Amarillo/Clayton area. The worst storm I've ever ridden through was between Amarillo and Clayton...with my wife on the back. Water was puddling on the highway so badly in the downpour that the bike was hydroplaning much of the time, not to mention lightning everywhere...and there's no real place to stop for extremely long sections...flat, open, exposed. Be glad you stopped for the night. That's one adventure I don't want to experience again.
Have a safe trip and keep the story coming.