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January 2013 mid-long range disco thread


Midlo Snow Maker

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Where the cold dumps is not nearly as important as the H5 pattern.  People obsense so much over getting it cold, but we could be 10 degrees and get rain the next day if the storm track is bad because of the general jet stream pattern.  Now before a few people correctly blast me for pointing out that DC needs cold air to get snow because they never do well in marginal events...I agree, but you need BOTH and we are now entering into the 4 week window where if the storm track is favorable then the cold will usually work out OK even for DC.  Its a small window but we are in it.  All this focus on the cold seems pointless to me unless we get a more favorable storm track, its not going to matter. 

 

Fixed.....these initial arctic dumps into the rockies/western plains always seem to modify quite a bit before getting here...hopefully this evolves in a way more favorable for cold lasting longer than a couple days

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There is a reason DC snows come in 1-2 feast years a decade and 7 famine with maybe one average year thrown in.  The ONLY pattern that is good for DC is a west based Nino or an east based one that is not too strong as to flood the continent with mild pac air.  Neutral winters tend to have a lag effect, so we also can do good in a neutral following a nino.  But following a Nina, we need a nino to rebooot the pattern before we will get the type of southern stream that we need in this area to really get big snows.  WIthout those big events, we are no going to have a big year as we are too far south/west and in a bad location with regards to the mountains to get nickel and dimed to death and get much above 10" in a year.  We desperately need a Nino to reboot things.  I lost interst in this winter when the Nino faded and it become obvious we were not getting it this year. 

 

What do the analogs say about a neutral after a neutral after a Nina after a Nina?

;)

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GFS is good enough for now. Major longwave shift going on. Paying close attention to details with shortwaves is kinda nutty. Anything can happen at this point because we just don't know where the pv sets up and how deep the airmass below gets into the US. 

 

I would hedge towards the cold sticking around longer than shorter. I don't think the end of the gfs is the likely scenario. IF (big if) the airmass as depicted does dump all over the eastern half of the country then it's going to be more stubborn to dislodge than a marginal airmass. 

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Last time DC was in the single digits was right near the last inauguration. 17th. That's one of those stats that used to be fairly regular that are now pretty unusual.

 

If it wasn't for the recent winters in europe, russia, and china I would say those days are gone but i think it's more a function of nh winter circ patterns than lack of actual cold air. Running the polar loop through then entire gfs run it looks like the coldest air in the nh is on our side of the globe for the foreseeable future. 

 

When's the last time a pv like the one currently modeled pushed air into our area? 2004?

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