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Pattern Discussion 12/15 and beyond


ORH_wxman

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This being the pattern thread, I thought I'd throw this up.

Hello 1993! One of these years it will work out....

12zECMWFENS500mbHeightAnomalyNH240.gif

How can you not love that High building straight out of the pacific through Alaska up to the pole?!? That is one snowy look because would that upper low off the west coast just keep shooting pacific energy across the country?

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The Christmas Eve/wee hour snowstorm begins an epic epic stretch folks..We have made it thru hell the last month and now ...now...now we are to the promised land..Collective sighs of relief as folks climb off bridges,, cut down robes, put razors back in drawers, unhook lips from tailpipes, put pill bottles away...

snapback.pngdonsutherland1, on 20 December 2012 - 01:33 PM, said:

Large-Scale Pattern Change Imminent...

A blizzard is currently raging in parts of Iowa and Wisconsin. That storm represents yet another event in the ongoing evolution of the pattern that will culminate in a much colder pattern locking in over a large part of the United States and southern Canada. Already, parts of Wisconsin have picked up 10" or more of snow. Strawberry Point has received 12.2".

Meanwhile, this morning was the 6th consecutive day on which Fairbanks, Alaska registered a low of -40°F or colder. To date, the monthly mean temperature is a frigid -19.4°F (16.3°F below normal). However, there are hints on the ensembles and also the CFSv2 that Alaska could grow notably warmer in the extended forecast range. As that happens, Arctic air could press southward, leading to what will likely be a colder than normal January across much of the U.S. (except for perhaps the Southwest and Florida) and southern Canada, if the leading analogs are accurate. The CFSv2 has been signaling a cold January for some time now.

Such a break featuring the warming in Alaska is not without precedent. For example, November 1977 saw Fairbanks come out with a mean temperature of -7.6°F (10.4°F below normal). November 2012 had very similar readings, with a mean temperature of -8.8°F (11.4°F below normal). The first 17 days of December 1977 were brutally cold in Fairbanks. The mean temperature was -32.8°F. 3 days had high temperatures of -40°F or colder. The lowest temperature during that period was -52° on December 13 and the highest temperature was -11°F on December 1. A rapid transition to milder condtions took place afterward. The December 20-31 period had a mean temperature of a toasty 10.8°F. 11/12 days had high temperatures above 10°F and 4/12 had highs in the lower 20s. 10/12 days had low temperatures above 0°F. The lowest temperature was -8°F on December 25 and the highest was 22° on December 26.

January 1978 had a mean temperature of +0.1°F (12.0°F above normal). January1978 had temperature anomalies that were fairly similar to those forecast on the December 20, 2012 run of the CFSv2 for January 2013.

Through December 19, the mean temperature in Fairbanks has been -19.4°F. The lowest temperature has been -48°F on December 17.

The latest ensemble forecasts suggest that the EPO could go neutral or negative toward the end of December. The PNA could go neutral or positive (and support for a turn to positive has been growing). The AO will likely remain negative. As a result, the forecast teleconnections suggest that the focus of the cold could shift south and eastward from Alaska into the CONUS and southern Canada. As 2013 begins, the risk of an Arctic outbreak appears likely to increase. One has seen such an outbreak appear on a few of the recent runs of the GFS for the start of January (including today's 12z run).

Folks,

The brand new Euro weeklies look similarly chilly and wet for much of the E US for the entire four week period. Also, the west based -NAO and the -AO blocks look impressive.

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The Christmas Eve/wee hour snowstorm begins an epic epic stretch folks..We have made it thru hell the last month and now ...now...now we are to the promised land..Collective sighs of relief as folks climb off bridges,, cut down robes, put razors back in drawers, unhook lips from tailpipes, put pill bottles away...

That's only the 3rd or 4th time you've called for an epic epic stretch starting so far this winter, lol. First it was the November 20th, then it was December 5th, etc.

Why does it always have to be an epic and historic stretch and can't just be a period of normal New England winter weather? I guess its not fun unless its epic. Run of the mill 4-8 inch snowstorms would be welcomed just as much as an "epic epic stretch" of 2-3 footers lol. Seems like folks are just setting themselves up for "blowing off steam" when the epic stretch turns out to be a couple 1-3 inch snowfalls...or worse yet, 1-3 inch rainfalls.

Hey we are bound to get a widespread synoptic snowfall at some point...climo will eventually catch up even if its not epic.

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That's only the 3rd or 4th time you've called for an epic epic stretch starting so far this winter, lol. First it was the November 20th, then it was December 5th, etc.

lol

While kevin is almost always wrong or at least prone to extreme exaggeration he's entertaining and certainly much better than edugs with that nasty demeanor lol.

I like where we stand for the next few weeks. Some flakes on Xmas would be great as would the chance for some snow later in teh week. We're in good shape IMO.

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That's only the 3rd or 4th time you've called for an epic epic stretch starting so far this winter, lol. First it was the November 20th, then it was December 5th, etc.

Why does it always have to be an epic and historic stretch and can't just be a period of normal New England winter weather? I guess its not fun unless its epic. Run of the mill 4-8 inch snowstorms would be welcomed just as much as an "epic epic stretch" of 2-3 footers lol. Seems like folks are just setting themselves up for "blowing off steam" when the epic stretch turns out to be a couple 1-3 inch snowfalls...or worse yet, 1-3 inch rainfalls.

Hey we are bound to get a widespread synoptic snowfall at some point...climo will eventually catch up even if its not epic.

HA! 4-8" would undoubtedly seem epic down here. Haven't seen that much snow at once in two years!

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That's only the 3rd or 4th time you've called for an epic epic stretch starting so far this winter, lol. First it was the November 20th, then it was December 5th, etc.

Why does it always have to be an epic and historic stretch and can't just be a period of normal New England winter weather? I guess its not fun unless its epic. Run of the mill 4-8 inch snowstorms would be welcomed just as much as an "epic epic stretch" of 2-3 footers lol. Seems like folks are just setting themselves up for "blowing off steam" when the epic stretch turns out to be a couple 1-3 inch snowfalls...or worse yet, 1-3 inch rainfalls.

Hey we are bound to get a widespread synoptic snowfall at some point...climo will eventually catch up even if its not epic.

Probably true but reading this post is like dreaming all night of a romp with a hot babe but waking up to Rosie O'donnell. Major weenie deflation.
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lol

While kevin is almost always wrong or at least prone to extreme exaggeration he's entertaining and certainly much better than edugs with that nasty demeanor lol.

I like where we stand for the next few weeks. Some flakes on Xmas would be great as would the chance for some snow later in teh week. We're in good shape IMO.

In the meantime PF knows his upslope machine is turned on big time so synoptic means nothing to him.
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