More colder weather

The GFS model has been showing the development of an eastern upper air trough, allowing cold air to filter into our area again this coming weekend.

This trough will develop at the same time that moisture is streaming up from the Gulf of Mexico.  As a result, low pressure is expected to develop near us, in the Saturday -Sunday time frame.

With some precipitation occurring at night and with atmospheric thickness levels falling below 540 dm, it is possible that we will see some light snow, unlikely to accumulate, if the precipitation occurs during the night time hours.

Wednesday Update: The latest GFS continues with the possibility of snow, with the timing occurring during Sunday afternoon and evening. It’s not a sure thing, but the models have been somewhat consistent.

It should be noted that the GFS model has been depicting this possibility for almost two weeks.  And it should be noted that a week ago, the Channel 6  weather people emphatically declared no more snow for our area this season.

Philly Weekend Weather Forecast

High pressure over our area will bring sunny skies and cooler temperatures (although still above average) on Saturday.  High temperature about 55.

The high will retreat to the northeast late Saturday, allowing an easterly flow to develop.  Some cloudiness develops late Saturday afternoon.

The easterly flow will combine with moisture from the south, giving us a cloudy Sunday with a good chance of rain for much of the day.  Forecast High 54.  (It wouldn’t surprise me if tempertures struggle to hit 50.)

Weather… and Other Things 'Up in the Air'