THIS WEEK’S WEATHER

A trend towards milder weather this week has been well-advertised. As we saw about two weeks ago, the AI models are forecasting highs to be somewhat higher than the operational models.

First, here’s what’s happening now, Sunday afternoon—

Current satellite water vapor image with superimposed RAP model Mean Sea Level Pressure isobars (black contours) potential vorticity (fine violet/yellow contours) with superimposed MRMS RADAR. (Click on image for a larger view.)

Monday will be windy and gusty in the afternoon, ahead of a weak front.

The low pressure system in Canada (L) will move rapidly eastward and a front will develop to our west associated with that northern system on Tuesday with clouds and some showers possible mid afternoon according to the GFS and NAM-NEST.

02-23-25 12z GFS forecast for Tuesday at 3 PM. (Click on image for a larger view.)

It will briefly colder Tuesday night, but temperatures partly rebound on Wednesday.

Here’s the NBM temperature meteogram, for Blue Bell, showing its high temperatures (TMAX)—

12z NBM high temperatures, temperatures and dewpoints for Blue Bell PA (Click on image for a larger view.)

The new ECMWF-Single AI model shows these highs—

12z ECMWF Single (AI) forecast temperatures at 1 PM. The free version does not offer a TMAX, and it’s every 6 hours, so you don’t see the high temperature at 3 PM; You can probably add at least two degrees to its temperatures shown. (Click on image for a larger view.)

By Thursday afternoon, another stronger cold front is expected to move through with some rain—

A cool down for Friday and another cold weekend follows, but then a big warmup for the first week in March.


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