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December Pattern Disco- 2013


Damage In Tolland

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Its a very low confidence ensemble mean on the Euro....the spaghetti plots are a disaster after D10...even more than usually is expected for the long range.

 

I don't think this is a surprise though based on the discussion here.

Seems like models are in pretty good agreement with Canada remaining quite chilly and the Pacific becoming not as favorable for cold intrusions deep into CONUS - and possibly a warm setup for CONUS with the Pac jet ramping up into the Pac NW. Not a whole lot more to say at this juncture. The people rooting for extreme cold and snow continuing are just as silly (and annoying) as the people claiming we'll torch D10 and beyond. 

 

My gut feeling is that after a cold period we relax some and to be honest nothing about this pattern (either next week or beyond) looks particularly good for snow lovers in most of SNE barring a well timed SWFE. 

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A lot of uncertainty in the pattern after 12/15...that is about all you can say at this point. The arctic freeze will relax some, that is probably a given, but what happens after that relaxation is still well up in the air, including just how much of a "relaxation" we get (i.e. how much we warm).

I think there are two main factors that will influence our sensible weather:

1) Eastward progression of cold air following the -EPO block. We've released a tremendously cold air mass into the Canadian Prairies, but this manifests itself as a rare Great Basin arctic high rather than spilling down the Plains in the classic McFarland signature. 850s are colder in California than NYC. We have to see if the cold progresses east from the frigid western source like December 2007 or stays west like the historic 1972 outbreak.

2) Position of ridge in long term. Most models maintain above average heights near AK, but the exact location is critical. The current position allows for a -PNA and keeps the SE ridge intact, putting New England on borderline for snow like 12/19/08. Any further west and you get a GOA low and PAC jet. If the ridge shifts east towards Yukon we can have a cold snowy stretch like Jan 2009 which finished -4 in NYC with a region wide winter event on 1/28/09(had 13" in Middlebury and 6.5" Dobbs Ferry)...

We walk a fine line but the -EPO that produces a mediocre December usually produces a great January if it holds as the jet stream naturally migrates south. Many Nina years with a favorable PAC have a nice January like '09 and '11...

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