As your well aware, we’ve two things going on right now, 1) Dec 1-20 has been mild 2) arctic air is making a comeback.

Some interesting notes, yesterday’s high of 65 degrees in Philadelphia was the city’s warmest Christmas Day in over 30 years while Detroit is on track to see it’s first December in 125 years without measurable snow. A big turnaround is coming!

Because of the positive NAO and subsequent stronger than normal Southeast ridge verses a 1056+ high diving into the Rockies, we’ve a major atmospheric fight coming up. An avenue for Eastern storminess.

Quite the arctic attack setting up for the West initially as heights explode up over Alaska and NW Canada.

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GFS has an incredible near 1060mb surface high diving into western Montana next Tuesday with 498 thicknesses representing extremely cold, dry Arctic-Siberian origin air.

As this major arctic air mass comes crashing south, so the storm track becomes much more active and as a result the national snow cover will expand significantly over the next 7-10 days.

GFS snow cover expands

Initial

168h

240h

GFS has some very impressive 7-DAY MEAN TEMP ANOMALIES

0-7 day

8-14

See today’s video. More tomorrow.

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