Category Archives: Weather Forecasts

Updated Philly Weekend Forecast

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Updated Forecast- the weekend is looking better!

Our seemingly endless string of perfect weekend weather may be ending this coming weekend. Weak high pressure will allow a southwesterly flow of warm, humid air over us, as an upper air trough tries to build down from Canada late in the weekend.

The latest models have delayed the wet weather to Sunday evening.

Saturday looks to be nice hot summer day, as high pressure controls our weather. On Sunday, the upper trough approaches bringing clouds and showers early evening.

The trend of unsettled weather likely extends Monday into Tuesday.
Sat 7/12: Mostly sunny and very warm. High near 90.

Sun 7/13: Some sun early, then increasing cloudiness. It looks like showers wait until evening. High 86.

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Philly Weekend Weather

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GFS forecast map for Sunday afternoon
GFS forecast map for Sunday afternoon

Our seemingly endless string of perfect weekend weather may be ending this coming weekend. Weak high pressure will allow a southwesterly flow of warm, humid air over us, as an upper air trough tries to build down from Canada. The interaction of these two flows will result in instability, cloudiness and showers, especially during the afternoon and evenings. (In a previous posting, I thought the upper trough would center over us giving us cooler weather, but it appears that we will stay on the eastern side of the trough for now.)

Saturday looks to be the better day, as the upper trough will be further away. Expect a fair amount of sunshine with the cloudiness. Much of Saturday should be dry. But with the the upper trough closer on Sunday, expect more showers and clouds, especially in the afternoon and evening.

The trend of unsettled weather likely extends Monday into Tuesday.

Sat 7/12: Partly cloudy/partly sunny, seasonably warm and humid. High 87.

Sun 7/13: Mostly cloudy, some sun possible with a good chance of showers especially during the afternoon. High 88.

Philly Weather Outlook

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Just when we thought we were heading into the hot and humid dog days of summer, the GFS model is suggesting the development of upper air troughs for both the end of the week and again early next week. Preceding the troughs, wet weather and instability thunderstorms are likely, followed by cooler weather.

Unusual for July, the usual hot Bermuda high pressure system will be pushed eastward. So expect an end to the heat wave by Thursday.

The weekend looks good right now.

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imageHigh pressure builds in behind departing hurricane Arthur, and a classic summertime Bermuda high sets up to bring typical July heat and increasing humidity by Monday. But this weekend in Philadelphia will be another spectacular one, weather-wise.

Sat 7/5: Sunny and warm. Low humidity. High 86

Sun 7/6: Sunny and warm. Continued pleasant. High 87