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Mesoscale Discussion 1970
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   MESOSCALE DISCUSSION 1970
   NWS STORM PREDICTION CENTER NORMAN OK
   0349 PM CST TUE DEC 09 2014

   AREAS AFFECTED...PORTIONS OF INTERIOR MAINE AND NRN NH

   CONCERNING...HEAVY SNOW 

   VALID 092149Z - 100315Z

   SUMMARY...AN AREA OF HEAVY SNOW IS EXPECTED TO CONTINUE IN WRN
   PORTIONS OF NRN MAINE AND NRN NH...SHIFTING NEWD ACROSS NRN MAINE
   THROUGH THE EVENING. SNOWFALL RATES OF 1-2 INCHES PER HOUR WILL BE
   POSSIBLE.

   DISCUSSION...A SURFACE LOW CURRENTLY DEEPENING OFF THE LONG ISLAND
   COAST IN RESPONSE TO STRONG LOW-LEVEL WAA AND ENHANCED BAROCLINICITY
   ALONG THE COAST IS EXPECTED TO MOVE OVER CT/RI THROUGH THE EVENING.
   A BAND OF MODERATE TO HEAVY SNOW CURRENTLY STRETCHES ACROSS CNTRL NH
   TO W-CNTRL MAINE...POSSIBLY RESULTING FROM ENHANCED LOW-LEVEL
   FRONTOGENESIS ALONG A NARROW WEDGE OF SUB-FREEZING NEAR-SFC AIR THAT
   IS HOLDING EAST OF THE WHITE MOUNTAINS. NUMERICAL GUIDANCE FORECASTS
   THIS BAND TO MOVE SLOWLY NORTH AND EXPAND TO THE NE ACROSS NRN MAINE
   THROUGH THE PERIOD. RAP FORECAST SOUNDINGS SUGGEST A DEEP
   SATURATED...NEAR-FREEZING/ISOTHERMAL LAYER SUPPORTING EFFICIENT SNOW
   AGGREGATION PROCESSES BENEATH A MODESTLY DEEP AND NEARLY SATURATED
   DENDRITIC GROWTH ZONE AROUND THE 600-500-MB LAYER. THESE FACTORS
   WILL LIKELY SUPPORT HEAVY SNOW WITH RATES OF 1-2 INCHES PER
   HOUR...GREATEST ACROSS WRN PORTIONS OF NRN MAINE.

   SE PORTIONS OF THE HIGHLIGHTED AREA IN CLOSER PROXIMITY TO THE COAST
   COULD EXPERIENCE A CHANGE TO MIXED RAIN/SNOW OR ALL RAIN BEFORE LATE
   EVENING. HOWEVER...AREAS GENERALLY N OF A LINE FROM LEW-AUG-WVL ARE
   EXPECTED TO EXPERIENCE MOSTLY SNOW THROUGH 04Z. AN EXPANSIVE DRY
   SLOT BEHIND A LEAD SHORTWAVE TROUGH CURRENTLY PROGRESSING OVER NYC
   AND LONG ISLAND PER WATER VAPOR IMAGERY SHOULD OVERTAKE THE AFFECTED
   AREA AFTER 04Z FROM SW TO NE.

   ..COHEN/CONIGLIO.. 12/09/2014


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

   LAT...LON   44886907 44237001 44037081 44297148 44867141 45257100
               46046978 46346891 46276845 45916794 45386804 44886907 

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Page last modified: December 10, 2014
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