Daily Archives: Monday, January 20, 2025 4:59 pm

Philadelphia Weather Outlook

THIS WEEK’S WEATHER

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Posted Tuesday 01/21/25 @ 11:36 AM — The cloudiness forecast for today are still on the way, according to several models. We’ll likely see cloudiness by 2 PM, especially areas from the city southward.

Of interest are some disturbances in the jet flow just to our south. The latest Canadian and ECMWF show some light snow (flurries to coating) in Cape May and surrounding areas later this evening. There’s even the chance of some flurries here in the city, especially areas southward.

WV image 11:30 AM showing embedded disturbances expected to pass mainly to our south, but the northern fringe will brush southern areas this evening. (Click on image for a larger view.)

Posted Monday 01/20/25 @ 6:08 PM — One more thing. An very fast jet stream will be overhead tomorrow (225 mph winds!) with embedded areas of vorticity (disturbances). The GFS is forecasting quite cloudy skies tomorrow, Tuesday.

Previously Posted Mon @ 4:59 PM — The extreme cold weather expected this week has been well-advertised. High temperatures in the teens and lows in the single digits.

Here’s the current water vapor image—

Current satellite water vapor image with superimposed RAP model 500-1000 mb thickness lines (yellow), jet level wind streamlines (orange contour-arrows) potential vorticity (fine violet contours) and superimposed MRMS radar. Large High pressure and deep cold. (Click on image for a larger view.)

I don’t know about you, but I find it a bit confusing and misleading when the TV weather people flip back and forth between wind chills and actual temperatures. The words “conjured sensationalism” come to my mind.

With the large cold high pressure over us, any storm development appears to be suppressed to our south. A low pressure system north of the Great Lakes Thursday and an associated cold front will bring some clouds at times later in the week. More cold pressure expected to reinforce this cold weather into the weekend.

NAEFS forecast for Thursday. Low pressure will move off the southeast coast is expected to move away from us as more high pressure builds in. (Click on image for a larger view.)

There may be a few upper air disturbances that move through during the week, but nothing stands out right now.