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December and a Hint of January Pattern Discussion


Bob Chill

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Euro ens are an outlier, but that 1st week of january looks stormy...we should have several trackable events...probably with tricky tracks...

Matt,  I pretty much agree, it looks like a colder than normal period that could be stormy but with a not so good storm track for us at least in terms of a big snowstorm.  It probably has more mixed and ice potential than big snow potential. 

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Matt,  I pretty much agree, it looks like a colder than normal period that could be stormy but with a not so good storm track for us at least in terms of a big snowstorm.  It probably has more mixed and ice potential than big snow potential. 

 

agreed...maybe since climo is better, we can get 2" out of a mangled storm instead of 1"....I like the bad track events better than 39 and overcast....70 is kind of nice for a day or 2, but then give me a stormy pattern even if they are bad tracks...they are kind of fun to forecast anyway

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12z Euro Ens Mean has very little spread in the idea of a strong vortex over southern Hudson Bay on day 10

 

For the top 5 analogs for today's run for the 5 days centered on 1/2...3 had snow during the 5 day period....and 3 had a super cold day, but in all 3 of those examples the cold shot was 1 or 2 days only

 

Coldest Day/Snow events within 5 day period

 

24/11, T

27/17, 2.2"

21/13, 3.4" and 1.4"

40/33, T

37/26, 0.3"

 

I think this lends some credence to the idea some of us have that the 1st week of January has a better than normal chance of a cold shot, and a better than normal chance of a 1-3" event for immediate DC metro....

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This thread is dead :(

It will be on fire next week. DC will break its 2" snow drought before the first week of Jan is over.

Next week isnt dead either. Sneaky vorts to keep an eye on. But they won't be as exciting as the 3 day record breaking warmth that 3 people seem to be all excited about.

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I've decided to not look at models beyond 5 days just to try and keep winter from seemingly flying by, but I did look at the AO, NAO, and PNA forecasts and they keep getting better each day.

You should be busy in a week then.

A more sustained cold and active period is becoming pretty clear. We should manage to be on the winning side of something even in the cities coming up. Nothing classic from what I'm seeing but timing something appears like it might be easier than usual.

If dc doesn't hit a 2" storm before the 4 year anniversary then there are things going on behind the scenes that cannot be explained except maybe in some back alley room in the French quarter.

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You should be busy in a week then.

A more sustained cold and active period is becoming pretty clear. We should manage to be on the winning side of something even in the cities coming up. Nothing classic from what I'm seeing but timing something appears like it might be easier than usual.

If dc doesn't hit a 2" storm before the 4 year anniversary then there are things going on behind the scenes that cannot be explained except maybe in some back alley room in the French quarter.

Watch it, Bob. Wes is going to come in here and tell you how it doesn't look very cold - just maybe a little below normal - and that any events will be messy except for out in Winchester or up in Williamsport.

;)

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Watch it, Bob. Wes is going to come in here and tell you how it doesn't look very cold - just maybe a little below normal - and that any events will be messy except for out in Winchester or up in Williamsport.

;)

No, Bob's gonna be the Mi Altantic spokesman on longer range stuff unless Matt sticks his head in. 

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GFS has an interesting look next monday. Arctic front with an unusual amount of moisture streaming in front and also a decent h5 pattern with relavtively flat compressed flow above us and vorticity at the base of the trough. The moist frontal passage is suspect but the overall look could bring a small surprise.

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GFS has an interesting look next monday. Arctic front with an unusual amount of moisture streaming in front and also a decent h5 pattern with relavtively flat compressed flow above us and vorticity at the base of the trough. The moist frontal passage is suspect but the overall look could bring a small surprise.

Sort of Miller-B's the vort once it hits the coast.  

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Sort of Miller-B's the vort once it hits the coast.

I think what makes it so interesting is there is cold hp over top and a 50/50 block. This is one of the ways we can get something underneath us. Probably the most promising run for pre-14 snow I've seen. And it might blow up into a happy hour blizzard @ 18z and then go poof at 0z. We do this dance well.

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If dc doesn't hit a 2" storm before the 4 year anniversary then there are things going on behind the scenes that cannot be explained except maybe in some back alley room in the French quarter.

 

3-year anniversary of Commutageddon will be on Jan. 26th, 2014.  Hard to believe that's the last time DCA broke 2" for a single event.  Even though others in the metro area (especially the farther out you live) have cracked that line, that's the last area-wide event as such.  We've had two events now (March 5-6 and Dec. 10) that stand out as notable "failures" for getting such an area-wide moderate snowfall when it looked quite possible.

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I think what makes it so interesting is there is cold hp over top and a 50/50 block. This is one of the ways we can get something underneath us. Probably the most promising run for pre-14 snow I've seen. And it might blow up into a happy hour blizzard @ 18z and then go poof at 0z. We do this dance well.

Arctic air = great ratios = 50:1?  

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GFS has an interesting look next monday. Arctic front with an unusual amount of moisture streaming in front and also a decent h5 pattern with relavtively flat compressed flow above us and vorticity at the base of the trough. The moist frontal passage is suspect but the overall look could bring a small surprise.

 

Is this actually the same general system that was supposed to be the NYE event in earlier runs of the GFS?  Same general time period, different evolution?

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Is this actually the same general system that was supposed to be the NYE event in earlier runs of the GFS?  Same general time period, different evolution?

Not exactly.  That was a southern stream system.  GFS is now squashing any southern stream activity with the PV bulging southward.  A couple runs showed the two streams phasing for NYE/NYD.  

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Arctic air = great ratios = 50:1?

I was thinkin 40-45:1 tops but I'll go with what you said.

GFS keeps post new years looking prime for something to break the 2" drought. Plenty of ss moisture and cold air around. I'm trying not to go all in and I haven't yet but if this type of pattern keeps showing the day after xmas I'm going to be in rare form.

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Not exactly.  That was a southern stream system.  GFS is now squashing any southern stream activity with the PV bulging southward.  A couple runs showed the two streams phasing for NYE/NYD.  

I see...so related, but not exactly the same.  Interesting how it's gone back and forth with how that evolves.

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Not exactly. That was a southern stream system. GFS is now squashing any southern stream activity with the PV bulging southward. A couple runs showed the two streams phasing for NYE/NYD.

Yea, this is a new look. I might be wrong but I don't remember an arctic front aligned like this in previous runs. It's a good setup to maximize being on the n side of a weak vort. Highly suspect run but fun to look at.

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