Possible White Christmas Day

The statistical models have been suggesting the possibility of a secondary low pressure system developing off the coast along a cold frontal boundary.   The deterministic models ( GFS, NAM) haven’t shown anything until today.  The general trend has been for the secondary low to form too far north and east to give any significant snowfall to our area, but the models are showing a light coating.

Below are the current low pressure center possibilities, based on different GFS possibilities (“perturbations”).  Most are somewhat north and east. 

Philly Weekend Weather

The dip in the jet stream that has brought all of the cold weather relaxes as high pressure moves away.

On Saturday, early sun will fade somewhat in the afternoon as clouds associated with a weak upper air disturbance moves across the area.  High temperature near 40.

Sunday will start partly sunny, but a weak warm front will move through in the afternoon, bringing some cloudiness. High around 41.