NOAA weather shows Friday to be mostly sunny, so it looks like only remnants of this week's storm will be hanging around.
That said, yes, thunderstorms can occur even down low, but are definitely most prevalent at the crest.
As for grabbing "a walk-up overnight pass", there are no walk-in passes available any more. You have to reserve them online on
recreation.gov first, and then you can walk in and pick it up.
