I believe this formed from the remnant of a cold front. Last week was the coolest (a few degrees, but still warm) and driest I can remember for Florida in mid June.
Nope. Formed as a part of the monsoon trof that was in the Caribbean. We've (I'm a meteorologist) been watching it for the better part of a week. The computer models, the global models anyway, have been forecasting it to develop over the Gulf over the weekend and they were right.
Where do you live in Florida? It’s been pretty wet here in St Augustine (NE FL) for about six weeks, which is actually earlier than our usual “afternoon thundershowers” pattern.
We have had a fair number of nor’easters, in addition to the storms that we say “come from Gainesville”, meaning from the west or the Gulf. It was dry last year but so far, not this year.