Updated on Sat 9:12 AM highlighted below

The cooler, less humid air mass that moved in will continue to influence our weather on Saturday. Two weak fronts will move in Sunday.

Saturday will be partly sunny. Return of moisture aloft may result in some cloudiness in the afternoon with a slight chance of an isolated shower far ahead of an approaching warm front. High temperature 86.0º ± 1.3º NBM model Blue Bell. Dew points in the upper 50s to near 60º.

UPDATED NBM thunderstorm/rain probabilities timing meteogram for Blue Bell, PA; MOST OF THE ACTIVITY IS STILL FORECAST TO REMAIN JUST TO THE WEST OF PHILADELPHIA SUNDAY EVENING. (Click on image for a larger view.)
Latest NBM precip forecast 8 PM Sunday. (Click on image for a larger view.)

A weak warm front will move in before daybreak on Sunday. Some scattered showers before daybreak. Clouds early will break for sunshine by afternoon.

As a result of this warm front, Sunday will have noticeably higher humidity (dew points) than Saturday. Dew points will move back into the uncomfortable 70º range. High temperature 87.0º ± 2.2º NBM model Blue Bell.

A weak surface trough may move through on Sunday evening with scattered showers and maybe some thunderstorms especially in western suburbs.


While we’ll be moving back into the 90º+ range by Tuesday, the extreme heat being forecast for the middle of the country does not appear to make it into our area because we’ll still be a slightly different upper air situation—

Jet stream level flow on Friday. Extreme heat is kept from our immediate area. (Click on image for a larger view.)