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Mesoscale Discussion 1957
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MD 1957 graphic

   MESOSCALE DISCUSSION 1957
   NWS STORM PREDICTION CENTER NORMAN OK
   0259 PM CST WED NOV 26 2014

   AREAS AFFECTED...SRN AND DOWNEAST MAINE...NRN NH AND VT

   CONCERNING...HEAVY SNOW 

   VALID 262059Z - 270300Z

   SUMMARY...HEAVY SNOWFALL CONTINUES TO EXPAND NEWD INTO NRN PORTIONS
   OF NEW ENGLAND. RATES INITIALLY OF 1-2 INCH PER HR ARE LIKELY...AND
   MAY LOCALLY EXCEED 2 INCHES PER HR NEAR THE COAST AFTER 23Z.

   DISCUSSION...SFC OBSERVATIONS FROM 20Z INDICATE RAPID COOLING OF
   TEMPERATURES OVER THE PAST 3 HRS OWING TO WET-BULB EFFECTS...NOW
   SUFFICIENT TO SUPPORT SNOWFALL OVER MOST OF THE REGION. BROAD ZONE
   OF LOW-MIDLEVEL CONVERGENCE CO-LOCATED WITH A PLUME OF SEASONABLY
   MOIST AIR /ESTIMATED AT 0.7-0.8 INCH NEAR THE COAST/ CONTINUES TO
   MAINTAIN A SWATH OF MODERATE TO LOCALLY HEAVY SNOWFALL EXTENDING
   FROM THE MID-ATLANTIC REGION NEWD INTO NEW ENGLAND. RATES ARE
   EXPECTED TO INCREASE FURTHER THIS EVENING...AS UPSTREAM MIDLEVEL
   WAVE PIVOTS NEWD WITH A CORRESPONDING INCREASE IN LOW-MIDLEVEL FLOW
   AND ASSOCIATED ISENTROPIC UPLIFT OCCURRING. 2-3 INCHES PER HR MAY
   BECOME COMMON DURING THE 23Z-03Z TIME PERIOD ACROSS COASTAL PORTIONS
   OF MAINE. LONG-DURATION NATURE OF THE EVENT COUPLED WITH A PERIOD OF
   INTENSE SNOWFALL RATES SHOULD RESULT IN A SIGNIFICANT HEAVY SNOW
   EVENT THIS EVENING AND OVERNIGHT.

   ..ROGERS.. 11/26/2014


   ATTN...WFO...CAR...GYX...BTV...

   LAT...LON   44736703 44106877 43317027 43277057 43597202 44157324
               44887263 44957142 45686900 45946779 45746779 45456732
               44736703 

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Page last modified: November 27, 2014
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