Updating Tonight's Thunder & Low Clouds
We never were fully able to shake the overcast north of the city as the stubborn marine layer was quite stubborn despite a sun angle equivalent to that in early August...so much for that "strong" sun. Stable air can win out just above a frontal boundary! It is warming aloft and that inversion or temperature differential between surface and aloft is aiding in the low clouds having a very slow burn across the region today. Where it did burn off temperatures jumped quickly into the 70's...and farther west...80's.
Around here? Mid 60's.
That warmer air out west is also unstable -- and the result is thunderstorms that have popped in scattered fashion across New York, Pennsylvania, and Maryland...all of which are moving southeast and east. The batch in Central PA, which you can see below as... [via Philadelphia Weather]