Philadelphia Area Weather Forecasts

Friday Forecast

Update Fri 01/20 @ 10:18 AM — Low clouds are moving in, as forecast. Wind gust forecast is somewhat reduced but still quite windy.

This morning’s 12z NBM showing cloud ceiling and cloud percentage (black contours) (Click on image for a larger view.)

Update Thu 1/19 10:11 PM — We had a lot more rain today than had been forecast by the models. Almost twice as much.

MRMS total 24 hour rainfall through 9PM tonight. (measured in mm 25.4 mm = 1 inch)

Previously Posted Thu 5:54 PM —

The deepening double-barreled low pressure system that brought us rain on Thursday will slowly move off to the northeast. A cyclonic flow will result in cloudiness afternoon and the pressure gradient will give us very windy conditions.

Today’s 12z GFS model forecast for 7 AM Friday. Deep low pressure will be departing. A tight pressure gradient will bring high winds and wind gusts later Thursday night into Friday. (Click on image for a larger view.)

Friday: Sun in the morning will be followed by considerable cloudiness and with very windy conditions. High temps in the mid 40s, but apparent temperatures (wind chills) will be in the upper 30s.

NBM wind meteogram for Blue Bell, PA shows winds gusting over 30 mph with sustained winds above 20 mph. (Click on image for a larger view.)