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Winter 2013-14 Pattern Discussion


CAD_Wedge_NC

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Just looked at the indices and they are not telling us a lot. Usually you can get an idea of where we are headed, but not this time. As some have already stated, we are going to have to wait and see what happens with this current system before we can get an idea of the post-storm pattern. The AO going negative and the fact that the ensembles are showing a better set-up than what we have been dealing with, is a good thing. The first 15 days of January might be our best shot at a real winter storm in the SE.

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Just a little difference between models.... the GFS does show a weaker southern disturbance at day 4 but it get's completely shredded and by day 5 it's gone while the Euro has almost a 2 contour H5 low. 

 

Only one little problem.... The Euro has difficulty with correctly handling energy in the southwest. Maybe this time it's right. Who knows.

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Tweet from Mike Dross at Wright Weather

Wright-Weather.com (@Wright_Weather)

12/27/13, 16:18

18Z NAM has a little bit of #Snow for the Carolinas and the South, Monday Night, #NCwx #ALwx

pic.twitter.com/wAmQvaGDpu

KjI63Jz.jpg

Nice snow hole over upstate and southern piedmont! Could see that happening, it does that alot
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Looks like we could get an appetizer on New Year's Eve before the main course on Jan 3 and 4. Really like how 2014 is going to start. Here is what NC Piedmont Weather had to say on facebook.

 

Significant Winter Storm POSSIBLE on January 3-4...See the weather maps from the 12z runs...It is important to use only the ensemble models during this progressive and hectic pattern change as the operational models will misread things most times until within 48-60 hours of the event...NOT a forecast but definitely looking like it has the POTENTIAL to become a much larger system than previously thought but we will see.

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Nice snow hole over upstate and southern piedmont! Could see that happening, it does that alot

 

 

Sad thing is I agree about it if the nam holds true and this does come to fruition then it will be a mainly light snow. Narrow band possibly feature lee side development and the snow shadow along the foothills. That band would have the potential to setup in S VA to RDU going S/E.

 

But then again also possible for nothing at all.

 

 

 

But there is also potential of it being stronger

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EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
1053 AM EST FRI DEC 27 2013

VALID 12Z MON DEC 30 2013 - 12Z FRI JAN 03 2014

...WINTRY PATTERN FOR THE EASTERN UNITED STATES...

USED THE 00Z/27 ECMWF FOR THE FRONTS AND PRESSURES FOR DAYS 3-5,
SWITCHING TO THE 00Z/27 ECENS MEAN THEREAFTER TO MITIGATE THE
INCREASING SPREAD IN DETERMINISTIC SOLUTIONS AT THAT TIME RANGE.
THE 00Z/27 AND 06Z/27 MODEL CYCLES SAW A REVERSAL IN POSITIONS OF
THE GFS CAMP VERSUS THE EUROPEAN CENTRE FROM YESTERDAY, WITH THE
GFS WARMING THE EASTERN UNITED STATES BY DAY 6 AND THE ECMWF AND
ECENS MEAN COOLING THE SAME REGION. TRIED TO KEEP CONTINUITY WITH
THE MANUAL CHOICES FROM YESTERDAY. BESIDES THE NEXT ARCTIC
ONSLAUGHT INTO THE UPPER MIDWEST, GREAT LAKES, AND SAINT LAWRENCE
VALLEY, IT APPEARS AS IF THE MID ATLANTIC STATES MAY BE MORE
VULNERABLE TO ACCUMULATING SNOW DAYS 6 AND 7. ROUGHLY TWENTY
PERCENT OF THE 00Z/27 ECENS MEMBERS INDICATE BETTER THAN A
HALF-INCH LIQUID EQUIVALENT FOR THAT REGION. A COUPLE MEMBERS
DEPICT A MAJOR SNOWSTORM. FOR NOW, WILL REFLECT A MODEST
QUARTER-INCH FOR THE MID ATLANTIC IN THE 00Z/28 DAYS 6-7 QPF.

CISCO
 

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surprised not more chatter with a possible snowstorm on the horizon.

 

Only 2 of the 12 18z GFS Ensemble members on EWall had a winter storm and both of those were a wintry mix.  The Euro Op offered the best potential with the wave getting deposited into northern Mexico - from there it would need to proceed east without getting squashed (NW flow over the northeast U.S. associated with the PV in SE Canada needs to relax - not impossible, but going to be tough)...and as CAD Wedge mentioned, that's a known Euro bias to deposit lows in the southwest, so you have to wonder whether that will really happen.  The UKMet was fairly similar, but it quickly squashes the wave as well as it starts to move east out of northern Mexico.

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surprised not more chatter with a possible snowstorm on the horizon.

Well the models have no clue whatsoever with the threat so there's nothing much to compare against. The varied solutions run to run are excruciating. Right now all we're doing is waiting until the GFS or Euro pop out a blockbuster situation and then we'll compare every run to that. Euro is too cold, GFS is not cold enough. End of disco. :lmao:

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