Surface high pressure with an upper broad cyclonic flow will provide colder than average temperatures, light winds and sunny skies this weekend on Saturday and some cloudiness on Sunday in Philadelphia.

Saturday will be sunny and cold. High 39. (Average high is about 45). Winds will be light.

Sunday will be similar- sunny and cold with light winds. High 39.

Updated Fri 10:30pm  Sunday will have mid and high level cloudiness based on the GFS model.  High 38

Outlook: A cold and dry week ahead.  Some heavy precipitation (likely rain or mix to rain) next Friday into Saturday. 


The coming weekend is going to be unseasonably cold and dry. The coastal storm’s track has consistently been forecast to pass south of the Philadelphia area late Sunday into Monday.

Despite my winter long range climate forecast for a cold winter in Philadelphia posted last weekend, the latest climate models show the balance of December to be somewhat milder than average. This change is predicted to occur later next week. We’ll see if this happens.  


Watching possible coastal storm for Sunday

There’s still wide model spread with the coastal storm that’s expected late Sunday.

Most of the models had been suppressing this to our south, but last night’s models, particularly the GFS-FV3 and the Canadian CMC are showing trends towards it moving up the coast, giving us snow.

Most of the statistical models (EKDMOS and NBM) and the operational European (ECMWF) keep a low chance (30%) of this happening, but this needs to be watched.  (The chances have been increasing.)

Tuesday night’s models keep the storm just to our south.