Attention! Attention! A snowstorm threat has been detected by global forecast models for next weekend.

Clipper system that may spawn a coastal low to the rescue(Sunday 12/20)…Last chance of a snow day before holidays.

Here are the possibility maps for this storm:(credit goes to AccuWeather Forums members for the maps.)

Storm track possibilities map 1:

Storm track possibilities map 2:

Scenario map with explanation:

GFS II run(as of Sunday 12/13):

Credit: NCEP/NOAA

Area of accumulating snow potential:

We may have a Miller B type storm next Sunday, strong clipper system may merge with a coastal low then ride up the coast and out to sea.

It looks as if we will have a complex weather scenario to deal with on the 20th. The clipper system merges with a potential coastal low and the two throw back enough moisture and cold for a big snow event. Yes, my dream has come true. Finally, we may have our first snow day before winter break. I’m guessing you want the clipper to disappear? I don’t see a good chance of not having snow next Sunday since the clipper itself is pretty robust. Score again. Not to mention this Clipper dives far enough south so it will be all snow and WILL attempt to LOCK in the cold air for the rest of this year. Cold forever! Clippers are the big exception to systems that approach from the west of MD that typically bring rain as we are on the warm side. Clippers are cold in origin so snow shouldn’t be a problem. Most clippers track SE from Alberta, Canada so the track is also further south than most other frontal systems or lake cutters. The jet pattern is set up far enough south to allow this clipper to take a track more to the south than usual. Clippers generally pass north of MD through NY state. Guess what happens afterward?

This is our LAST chance to get a snow day before the holidays. Big storm during the holidays and after potentially. These were the quick hitting snow events I hinted at some time ago.

This post may be revised if there are any major updates.

Right now it is a good estimate that we will get 1-3″ or 2-4″ of snow Sunday from the clipper alone without merging with a possible coastal low or just sunny or cold. To be conservative I would assume sunny and cold for now.

Chance of verification of coastal low(best case scenario): 30% chance

Chance of clipper storm itself: 60% chance