As expected, old man winter has made an early appearance over eastern Canada and the US following a very warm September.

This was Sep.

Check out the flip through the first half of Oct.

Yesterday’s departures were impressive.

An unusually cold and strong upper flow drove by far the coldest air of the season south and with 5k temps between -5 and -15C, instability snow showers developed, tracking NW to SE across much of the Northeast air space yesterday.

GFS trajectory of where this air has originated.

This is a very winter-like visible satellite view from yesterday with instability clouds blowing out of the NW out over the ocean.

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Nice view of ‘Bay effect’ clouds.

The air was cold enough to produce the classic lake effect snow bands with up to 9 inches of snow falling over the Tug Hill Plateau of New York.

Strong instability within the abnormally cold NW flow helped generated hefty snow showers across much of Maine yesterday.

This was back on Saturday in Bridgewater, ME.

Yesterday AM lows.

These were midday temps yesterday. More than midday in early December!

It’s another cold one this morning.

Down to 36 as far south as Atlanta, GA, 32 in Huntsville, AL.

Large area under a frost and freeze warning.

Down in the teens over NW New Jersey this morning.

What a difference a week makes on Mt Mansfield, VT

Last Monday

Today

This is quite the trough.

Check out the strength of the cold surface high.

Directly beneath the centre, that’s where the lightest winds and possibly the coldest temps will be. Low teens can’t be ruled out over the mountains of West Virginia.

Warming trend is on the way but interestingly the GFS ensemble isn’t particularly impressive.

The ECMWF is certainly more impressive. Just look at the flip within 24 hours over the Northeast!

Now

24 hours from now

and by 72 hours!

See video for the discussion.

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