Updated Sat 11:06 PM: Sunday forecast update is highlighted below:

Following two days of active weather, the forecast for this weekend is straightforward — high pressure builds in, both at the surface and aloft, bringing sunny skies and unseasonably warm (hot) temperatures, a marked change from last weekend.

Indeed, while last weekend featured temperatures in the mid 40s, this weekend, we’ll be catapulted into the low 90s!


Sunny and very warm. High temperature 90.8º sd 2.8º (NBM Blue Bell)


Sunny and hot. High 93.3º sd 3. (NBM Blue Bell) High temp still expected to be about 93 ± 2º. Dew points near 62º are beginning to reach a noticeable level, but still not very high. Tonight’s models show the possibility of an isolated thundershower far north of the city late Sunday afternoon.

An increase in the chance of thunderstorms on Monday, mostly west of the city and a significant increase on Tuesday and Wednesday in much of southeastern PA.


NBM wind meteogram for Blue Bell, PA  (Click on image for larger view)