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Mesoscale Discussion 201
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   MESOSCALE DISCUSSION 0201
   NWS STORM PREDICTION CENTER NORMAN OK
   1046 PM CDT WED MAR 19 2014

   AREAS AFFECTED...PARTS OF CNTRL MAINE AND CNTRL NH

   CONCERNING...HEAVY SNOW 

   VALID 200346Z - 200745Z

   SUMMARY...SNOWFALL RATES AROUND 1 INCH PER HOUR ARE POSSIBLE LATE
   THIS EVENING AND INTO THE OVERNIGHT /04-08Z/.

   DISCUSSION...SATELLITE IMAGERY SHOWS A CORRIDOR OF MOISTURE
   --CHARACTERIZED BY 0.75 PW-- OVER SRN NEW ENGLAND STREAMING NWD
   AHEAD OF A LEAD MID-LEVEL VORTICITY MAXIMUM OVER SERN ONTARIO/LAKE
   ERIE.  RADAR MOSAIC AT 0340Z SHOWS A MODERATE TO LOCALLY HEAVY BAND
   OF RAINFALL FROM LONG ISLAND NWD THROUGH MA LOCATED WITHIN THE WARM
   CONVEYER.  ADDITIONALLY...THIS PRECIP IS AIDED BY FORCING FOR ASCENT
   VIA THE LEFT EXIT REGION OF A 155 KT SPEED MAX OVER THE SRN
   APPALACHIANS THIS EVENING.  

   THE 00Z/20 GYX RAOB SHOWED A THERMAL PROFILE SUPPORTIVE OF SNOW AND
   FORECAST SOUNDINGS SHOW THE FAVORABLE TIMING AND OVERLAP OF
   INCREASING MID-LEVEL ASCENT WITHIN THE DENDRITIC GROWTH ZONE FOR
   PARTS OF CNTRL NH NWD INTO CNTRL PORTIONS OF MAINE.  AS A
   RESULT...IT APPEARS PLAUSIBLE A SWATH OF LOCALLY HEAVIER SNOWFALL
   RATES /AROUND 1 INCH PER HOUR/ WILL ACCOMPANY THE BAND OF HEAVIER
   PRECIPITATION AS IT MOVES NWD FROM SRN NEW ENGLAND INTO NRN NEW
   ENGLAND OVER THE NEXT SEVERAL HOURS.

   ..SMITH.. 03/20/2014


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

   LAT...LON   44177149 45946848 45886811 45616775 45336795 44317005
               43767106 43787153 44177149 

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Page last modified: March 20, 2014
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