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Mesoscale Discussion 32
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   MESOSCALE DISCUSSION 0032
   NWS STORM PREDICTION CENTER NORMAN OK
   0328 PM CST TUE JAN 21 2014

   AREAS AFFECTED...ERN MD/NRN VA/DE/NJ/SERN PA/SERN MY/SRN NEW ENGLAND

   CONCERNING...HEAVY SNOW 

   VALID 212128Z - 220330Z

   SUMMARY...HEAVY SNOWFALL -- ONGOING WITHIN A BAND FROM THE
   MID-ATLANTIC REGION NEWD INTO SRN NEW ENGLAND -- WILL CONTINUE
   THROUGH MUCH OF THE EVENING...WITH SNOWFALL RATES OF 1" TO 2" PER
   HOUR EXPECTED.

   DISCUSSION...LATEST RADAR LOOP SHOWS A RELATIVELY NARROW BAND OF
   MODERATE TO HEAVY SNOWFALL EXTENDING FROM NRN VA/ERN MD NEWD INTO
   SRN NEW ENGLAND.  THE SNOWFALL IS OCCURRING WITHIN A WELL-DEFINED
   DEFORMATION ZONE ON THE NRN AND NWRN PERIPHERY OF A SURFACE LOW
   ANALYZED JUST OFF THE SERN VA COAST...WHICH WILL CONTINUE TO
   DEEPEN/SHIFT NEWD WITH TIME AS A STRONG UPPER SHORT-WAVE TROUGH
   CONTINUES DIGGING INTO/ACROSS THE CAROLINAS/GA THIS EVENING.  

   THIS BAND OF SNOW IS FORECAST TO GRADUALLY CHANGE ORIENTATION THIS
   EVENING -- FROM BEING A SW-NE BAND TO MORE SSW-NNE CONFIGURATION --
   AS THE SURFACE LOW MOVES SLOWLY NEWD ACROSS THE WRN ATLANTIC WITH
   TIME.  THAT BEING SAID THOUGH...THE PIVOTING BAND OF HEAVIEST
   SNOWFALL WILL CONTINUE TO AFFECT THE MID-ATLANTIC/SRN NEW ENGLAND
   REGION THROUGH THE EVENING HOURS.

   WITH A COLD AIRMASS IN PLACE /TEMPERATURES AT THE SURFACE GENERALLY
   RANGING FROM THE TEENS TO LOW 20S/ SNOW-TO-LIQUID RATIOS AT OR ABOVE
   15-1 WILL AID IN ENHANCEMENT OF THE ALREADY HEAVY PRECIPITATION
   RATES.  THIS WILL SUPPORT SUSTAINED SNOWFALL RATES OF 1" TO 2" PER
   HOUR AFFECTING THE PHILADELPHIA/NEW YORK CITY/BOSTON CORRIDOR
   THROUGH THIS EVENING.

   ..GOSS.. 01/21/2014


   ATTN...WFO...GYX...BOX...OKX...ALY...PHI...BGM...AKQ...CTP...
   LWX...

   LAT...LON   41236955 40977023 40957093 40767194 40357291 39987345
               39487385 38667446 38157529 38217701 38547792 39587808
               40607665 42787178 42827079 42647018 42196950 41236955 

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Page last modified: January 22, 2014
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