Just got my post sunrise spike downward to 24.9°. I keep a pesky drainage flow all night and around this time it goes completely calm for like 20 minutes. My theory was that the tree tops start warming that layer while the sfc keeps radiating so the inversion briefly strengthens.
Yeah a lot of these ASOS sites aren't exactly representative of where people work and live. Some stand way out from other meso sites close by. Bob is finding that out with TAN now. OWD is basically sited in a swamp and then MVY is a little interior island pit.
Sounds like bird droppings in the cone. A little will soak through at near steady intervals and then at some point the whole dookie falls through and the remaining water in the funnel empties at once.