What happened to the rain?

Since it was Thursday, I headed for the park.  There was a black cloud to the south and obviously a storm coming toward the park and Huntsville.  So, to get in a run, I went to the track and ran 1.8 miles on the roads from there.  Still no rain.  I went to Iron Works and then home.  Still no rain.  5K in Centerville tomorrow morning.  The forecast says a 20 percent chance of rain at start time.  I bet it rains.