With the passage of that blinding lunchtime shower that turned the region's roadways into boulevards of brake lights, the temperatures have dropped drastically.
At Philadelphia International Airport fell 14 degrees between 11 and noon, from a balmy 64 to 50. At last report it was down to 46, with winds gusting to 29 m.p.h. At the peak of the rain, a gust of 46 was reported.
A downed tree between Malvern and Thorndale has disrupted service on SEPTA's Paoli line, and the rains have juiced flows on the region's rivers and streams. A National Weather Service spotter reported that Darby Creek was close to spilling over.
However, it appears that the heavy rain is over in the immediate Philadelphia area, and the late-day commute should be less eventful than this morning's.
But if the first day of the meteorological winter felt like a continuation of the balmy fall, tomorrow won't.
Temperatures will struggle to get out of the low 40s tomorrow, Friday and Saturday, and may stay in the 30s most of Sunday, Monday and Tuesday, with overnight lows in the 20s.
Still, no snow shows up yet in the forecast.