Daily Archives: Monday, February 3, 2025 10:04 am

Philadelphia Area Weather Forecasts

THIS WEEK’S WEATHER

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Posted Monday 02/03/25 @ 5:31 PM —Low pressure in the central US will move eastward and spawn a secondary coastal low near the Delaware coast before daybreak Thursday.

ECMWF AI forecast for 9AM Thursday



Temperatures in the mid levels of the atmosphere are forecast to be too warm for snow, but cold temperatures in the lowest levels will likely cause the precipitation to start as sleet and freezing rain, especially north and west of the city. This should change to all rain during the morning rush hour.

The rain should end by mid to late Thursday afternoon.

A somewhat similar situation will develop on Saturday. There are differences in the speed and timing of this system, but it’s looking to be primarily rain, again possibly starting as a mix.

Posted Monday 02/03/25 @ 10:52 AM —This week’s weather postings will be more sporadic than usual.

Originally Posted Mon @ 10:04 AM —

A frontal boundary to our south will become a focus for low pressure development later in the week. A storm system will move along this front from southwest to northeast late Wednesday into Thursday and again next weekend.

Slight changes in the intensity of the low pressure systems that develop along with changes in the position of the stalled frontal boundary will determine the precipitation type- snow- sleet-freezing rain-rain.

The current trend is for mostly liquid (rain) here in and around Philadelphia, but there are differences in the model forecasts, so uncertainty exists. Several models have snow changing to sleet and/or freezing rain Wednesday night. Too early to be sure.

ECMWF AI model—

ECMWF-AIFS forecast for Thursday at 7 AM. Freezing line at the surface (white) cuts through Philadelphia, but the magenta and red “thickness lines” to our north suggest this will be rain and sleet at this time, (Click on image for a larger view.)

By next Saturday, we’ll be in the warm sector ahead of an approaching cold front, according the the ECMWF-AI model—

ECMWF-AIFS forecast for Saturday night. Rain ahead of a cold front, but the (?) suggests the possibility that low pressure could develop again along the front. (Click on image for a larger view.)

An interesting set up. Stay tuned.