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East Coast winter storm, February 13th-14th, imminent (Part II)


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You guys from HFD-ORH and GAY will get a nice front ender even verbatim.

Like Will...I'm a little skepticle of that solution in terms of the 500mb evolution, but for BOS and points SE...it likely doesn't matter much unless this tracks closer to ACK. Hopefully this shuts up the VT crowd. No offense guys.

lol the storm hasn't happened yet. Wait for the other shoe to drop.

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BOX is doing a Q&A with the public on twitter. Mainly cautious with all comments as well expected. If you are interior all they are saying is 6+.

 

Of all the systems to do it with... this one? I'd rather run the Cleveland Browns than answer "my backyard" Twitter inquiries on this thing.

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Updated HPC/WPC Model Discussion

MODEL DIAGNOSTIC DISCUSSIONNWS WEATHER PREDICTION CENTER COLLEGE PARK MD213 PM EST TUE FEB 11 2014VALID FEB 11/1200 UTC THRU FEB 15/0000 UTC...SEE NOUS42 KWNO (ADMNFD) FOR THE STATUS OF THE UPPER AIRINGEST...==============================================12Z NAM/GFS EVALUATION AND PREFERENCES==============================================NAM/GFS INITIALIZATION ERRORS DO NOT APPEAR TOSIGNIFICANTLY AFFECT THEIR LARGE SCALE OUTPUT.==============================================...EASTERN U.S. CYCLONE AND WINTER STORM...PREFERENCE: BLEND OF THE 12Z ECMWF/UKMET WITH THE 12Z GFS ENSEMBLEMEANCONFIDENCE: AVERAGE ON THE LARGE SCALE...BELOW AVERAGE FORPRECIPITATION TYPEDESPITE BOTH NORTHERN AND SOUTHERN STREAM SHORTWAVES HAVINGENTERED THE NORTH AMERICAN UPPER AIR NETWORK...SOME SIGNIFICANTMODEL DIFFERENCES REMAIN. WHAT WE DO KNOW WITH CONFIDENCE IS THATTHIS STORM WILL PRODUCE VERY DISRUPTIVE ACCUMULATIONS OF ICE ANDSNOW OVER A BROAD SWATH AFFECTING THE SOUTHERN U.S. AND THE EASTCOAST STATES. CONCEPTUALLY THE MODELS INDICATE SIMILAR IDEAS TOONE ANOTHER...WITH SURFACE LOW DEVELOPMENT STARTING ALONG THECENTRAL GULF COAST AROUND 12/12Z AND THE CYCLONE THEN DEEPENING ASIT TRACKS ACROSS THE FAR SOUTHEAST STATES TOWARD THE OUTER BANKSIN NORTH CAROLINA AND THEN UP THE EAST COAST.THE GFS HAD BEEN ONE OF THE WEAKER SOLUTIONS ESPECIALLY WHENMEASURED BY THE SURFACE LOW DEPTH AND THE LATE ONSET OF A CLOSEDCIRCULATION AT 500 MB. THE GFS HAS TRENDED STRONGER AT THESURFACE...BUT IS STILL SLOW TO CLOSE OFF A LOW AT 500 MB...AND ISCORRESPONDINGLY FASTER IN ITS FORWARD SPEED. THE MOST CONSISTENTOPERATIONAL MODELS FROM RUN TO RUN HAVE BEEN THE ECMWF ANDUKMET...AND THEY DISPLAYED THE SAME TREND ON THE 12ZCYCLE...SLIGHTLY SLOWER...WHICH YIELDS A WARMER SOLUTION NORTHWARDALONG THE MID ATLANTIC/NEW ENGLAND COASTS. BLENDING THESE TWOMODELS TOWARD THE 12Z GEFS MEAN IS OUR APPROACH FOR FAVORING THEMORE CONSISTENT MODELS THAT ARE DISPLAYING SMALL SCALETRENDS...WHILE ACKNOWLEDGING THE CONTINUED WIDER RANGE OFSOLUTIONS REPRESENTED ESPECIALLY BY THE FASTER NCEP GUIDANCE. THEGEFS MEAN CLUSTERED MORE CLOSELY WITH THE ECMWF/UKMET...WHEREASTHE OPERATIONAL NAM/GFS WERE SIGNIFICANTLY FASTER.THE NAM HAS FALLEN NEAR CONSENSUS ON OCCASION...BUT THE 12Z RUNDID NOT. IT IS THE FLATTEST MODEL WITH THE SOUTHERN STREAMSHORTWAVE THAT SPURS THIS DEVELOPMENT OVER THE SOUTHEAST...WHICHYIELDS A FAST AND WEAK SYSTEM OVERALL. IT IS NOT RECOMMENDED TOPUT MUCH...IF ANY...WEIGHT ON THE NAM AFTER DAY 1.
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This storm looks pretty much perfect for the Berkshires, S VT, and E NY as it stands right now. There's a strong mesoscale snow band signal for this neck of the woods as a result of strong deformation and a healthy CCB on the backside of this low pressure that could result in an extended period of 1-2" per hour snows.

 

I have a hard time seeing how most of SNE save for the Berkshires and northern ORH hills stay all snow with this as the low will likely be a classic coastal hugger. As such, there's a good chance that a good chunk of VT and the Berkshires will finally get a good storm after a streak of lows that tracked near or SE of the benchmark fringed or whiffed this area.

 

That said, a quick front end dump featuring up to 6-10" of snow is possible before many areas of SNE flip. Some of the SE areas will likely see less than this and may not reach warning criteria though. Rain combined with a heavy snowpack in areas that change over could result in localized street flooding and roof leaks.

 

Although perhaps a little extreme with its 971 mb low, I think the 12z GGEM is most in line with how I think this event will pan out. I favor a Montauk/Block Island to CC type track. Euro is a little funky and how it closes things off so quickly and GFS is still too far east. This will be a big ticket event for the interior.

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The NAM is the only system that destroys everyone with heavy snow and the HPC say get rid of it. So why are we even taking big storm. GFS is SO much weaker and crappier.

I would ride the Euro.  It has been consistent, although I think it's latest run isn't the ultimate outcome.

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Snow map will be out @ 4pm per BOX

My guess is e pym county 1-2 outer cape nada. Then 2-4 shading se ct to pvd to cambridge to essex county (e of 95) i see 4-6 from IJD to Cumberland wilmington to n andover. 6-8 nw of that line over to Pepperell sw to shrews bury to just se of rev. 8-10 rev to n orh to birving and i see 14-18 far w ma .02 cents.

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