THIS WEEK’S WEATHER

Friday & Weekend Outlook

Updated Thu 10:34 PM — The forecast continues to evolve for the weekend. First, an upper air wave moving through on Friday will trigger showers and thunderstorms in far northwest areas mid Friday afternoon and these storms will move near the immediate PHL area late afternoon into the evening. Most but not all of the activity northwest of the city.

CAPE values are forecast to exceed 2200 j/kg, so strong storms are possible, but severe not expected.

The front sinks slowly through our area on Saturday. Strong storms and showers possible throughout the day, but late afternoon and evening are the most likely times.

Sunday and Monday are  looking better and better. Tomorrow’s Weekend Weather forecast will nail things down

Updated Thu 7:42 AM — The forecast for the weekend continues to improve, as the GFS now shows more spotty precip during the day and the heaviest rain during the evening hours. Most models show clearing by Sunday afternoon. Monday looks good.


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WEEKEND WEATHER FORECAST

Updated Sat 10:35 PM — Current Sunday forecast looks good. High temps 90-92°, dew points low 60s. The approaching cold front won’t affect us until Monday morning.

Showers and thundershowers Monday morning and early afternoon with the cold front likely will not be severe in our area. Some areas of heavy rain possible.


The upper air low pressure system will finally move out allowing high pressure and an upper air ridge to move in bringing much warmer conditions, above seasonable average temperatures. (average highs are 83º Blue Bell and 85º Philadelphia)

Today’s 18z GEFS shows the upper ridge (1) the upper low (2) and a cold front moving towards us (3) late Sunday. By the end of the week, the typical Bermuda high pressure (4) will move into its usual position bringing more heat and humidity. (Click on image for a larger view.)

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Sunday

Sunny and somewhat warmer. Lower dew points in the low 60s. High temperature 90.5º ± 3.5º NBM model, Blue Bell PA.

Today’s 19z NBM Model high temperatures Sunday. Black contours are 2 degree increments. (Click on image for a larger view.)

A cold front moves in late Sunday evening and overnight with showers and thunderstorms into Monday morning.