Daily Archives: Monday, February 20, 2023 8:13 pm

Philadelphia Area Weather Forecasts

THIS WEEK’S WEATHER

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Tuesday

This week’s weather continues to be defined by a warm — cold boundary that is waving northward and southward of our area while aloft, an extremely fast jet flow in excess of 210 miles/hr generating waves along this boundary.

GFS jet stream level (300 mb) wind speed on Friday. Note the 210 mph jet streak (white area) that remains persistent. (The winds in the jet streak are moving at 210mph… the jet streak area itself (the area of high winds) is hardly moving. A fast changing weather pattern, warm and cold with several impulses of low pressure rain will move through .

We’ll see the these rapid changes tomorrow (Tuesday) and Wednesday and later into at least next week.

Tuesday Forecast– A disturbance moves through after midnight tonight with showers, mostly ending by daybreak Tuesday. A few lingering showers possible Tuesday morning. Periods of clouds and sun Tuesday. Another front moves through Tuesday afternoon (2-4 PM) with a few scattered and locally moderate showers and even a thunderstorm (due to elevated CAPE in the 400 Joules/Kg range. )

Windy with the frontal passage. Skies clear in the later Tuesday afternoon. High Temps 54º-56º

A warm front moves through Wednesday afternoon with showers and possibly thundershowers.