Thanksgiving Weekend Weather Forecast

The high  pressure system that’s given us such splendid weather will give us one more day of nice weather.

Saturday will be sunny most of the day before clouds move in late afternoon and early evening ahead of a cold front.  No precipitation is expected. High temperature about 55.

Clouds associated with the cold front will be with us Saturday night before clearing develops Sunday morning.  Much of Sunday will sunny with some broken cumulus clouds, windy and colder with highs around 46.

 

 

Philly Weekend Weather- Late Afternoon Edition

An amplification in the jet stream will drop a cold front through our area late on Saturday.

Saturday starts with bright skies and possibly some sun very early, but clouds quickly move in by mid morning. By noon, it will be cloudy.  Both the NAM and GFS currently hold off the rain until 2-4PM (although some light spits possible before then.)   High temperatures about 54.   Moderate rain by evening and through the night.

Some showers still possible very early Sunday morning, then skies attempt to clear.  However, cold air aloft with the upper cyclonic flow will result in considerable broken stratocumulus cloudiness for much of Sunday.  It will be very windy and gusty on Sunday.  High 55 before the cold air moves in at the surface Sunday night.

(For Thanksgiving, the outlook is for below average temperatures – highs in the upper 40s. Looks mostly dry at this time, however, the statistical models are hinting at some light showers.)

I hope to be posting my Winter Outlook by the first week in December. 

Philly Weekend Weather

The current dip,in the jet stream has given us a taste of arctic air in early November.

Saturday will have sunny skies with continued cold temperatures.  High will be 40.

Winds shift Sunday morning with some moisture giving us some cloudiness early, then sunny skies with highs near 49.

 

Sunday Update and Comment

As has been the case over the past few weeks, my forecast for sky cover (cloudiness) hasn’t been too spot-on.   Yesterday was a good example, where the GFS had cloudiness for much of the afternoon, but we had beautiful sunshine.   (I use humidity fields at certain levels to predict cloudiness;  something hasn’t been working lately.)

I’ll take another stab at it today.   Low level cloudiness (stratocumulus and nimbostratus) lifts by afternoon, but mid-level cloudiness (altocumulus and altostratus)  will be with us for the rest of the day.  As far as sensible weather, it should just be cloudy.   The GFS also shows an ongoing chance of light drizzle through late afternoon.   High temp about 63.

The warm front moves through this evening, and winds shift to the southwest.