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Mesoscale Discussion 103
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   MESOSCALE DISCUSSION 0103
   NWS STORM PREDICTION CENTER NORMAN OK
   0227 PM CST THU FEB 13 2014

   AREAS AFFECTED...PORTIONS OF MAINE

   CONCERNING...HEAVY SNOW 

   VALID 132027Z - 140030Z

   SUMMARY...HEAVY SNOW WILL OVERSPREAD PORTIONS OF MAINE THIS
   AFTERNOON...ESPECIALLY AFTER 2130Z. SNOWFALL RATES OF 1-3
   INCHES/HOUR WILL BE POSSIBLE.

   DISCUSSION...REGIONAL SFC OBSERVATIONS AND MOSAIC RADAR IMAGERY
   INDICATE A SOLID SHIELD OF HEAVY SNOW ARCING FROM PORTIONS OF THE
   CATSKILLS TO COASTAL NH. THIS ACTIVITY IS ASSOCIATED WITH A
   MERIDIONALLY EXTENSIVE WARM CONVEYOR STRUCTURE PRECEDING A MID-LEVEL
   VORT MAX APPROACHING THE DELMARVA PENINSULA. AS THE PLUME OF
   STRONG...DEEP FRONTOGENETIC CIRCULATIONS AND ISENTROPIC ASCENT
   ATTENDANT TO THIS CONVEYOR CONTINUES TO SPREAD NEWD ACROSS NEW
   ENGLAND...THE HEAVY SNOWFALL WILL ALSO SPREAD NEWD.

   PRESENT INDICATIONS ARE THAT THIS SNOW -- WITH RATES OF 1-3 INCHES
   PER HOUR -- WILL SPREAD NEWD ACROSS AREAS FROM CNTRL TO COASTAL
   MAINE THROUGH THE AFTERNOON...ESPECIALLY AFTER 2130Z. THE SNOW WILL
   PERSIST INTO THE EVENING. AN ISOLATED LIGHTNING STRIKE OR TWO MAY
   OCCUR WITH THE HIGHEST SNOWFALL RATES OWING TO THE INFLUX OF MEAGER
   ELEVATED BUOYANCY. BY LATE AFTERNOON/EARLY EVENING...STRONG WARM
   ADVECTION ALOFT MAY SUPPORT A PRECIP-TYPE TRANSITION TO SLEET OR
   EVEN RAIN OVER COASTAL AREAS. INTO INTERIOR PORTIONS OF
   MAINE...COLDER TROPOSPHERIC THERMAL PROFILES CHARACTERIZED BY A DEEP
   NEAR-ISOTHERMAL LAYER CENTERED AROUND OR JUST BELOW 0C SURMOUNTED BY
   ASCENT-COINCIDING DENDRITIC GROWTH ZONES SHOULD EFFICIENTLY SUPPORT
   SNOW GROWTH/AGGREGATION.

   ..COHEN.. 02/13/2014


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

   LAT...LON   44206899 43836983 43637041 44047082 44617078 45606955
               46076800 44986708 44666730 44206899 

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Page last modified: March 20, 2014
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