MESOSCALE DISCUSSION 0241
   NWS STORM PREDICTION CENTER NORMAN OK
   0537 PM CST THU FEB 28 2013
   
   AREAS AFFECTED...NRN/ERN MAINE
   
   CONCERNING...HEAVY SNOW 
   
   VALID 282337Z - 010330Z
   
   SUMMARY...A SHIELD OF HEAVY SNOW WITH RATES OF 1-2 IN/HR WILL
   PERSIST INTO THE EVENING...WITH THE PRECIPITATION EXPECTED TO
   GRADUALLY TAPER OFF AFTER 03Z-04Z.
   
   DISCUSSION...A MID-LEVEL SHORTWAVE IMPULSE PIVOTING AROUND A LARGER
   CYCLONIC GYRE OVER THE NERN STATES -- PER RECENT MOISTURE-CHANNEL
   IMAGERY -- WILL CONTINUE TRACKING WNWWD ACROSS NRN NEW ENGLAND.
   MID-LEVEL ISENTROPIC ASCENT LEADING THIS IMPULSE ALONG WITH THE
   INFLUX OF MOISTURE FROM AN OFFSHORE WARM CONVEYOR BELT CONTINUE TO
   SUPPORT A SHIELD OF HEAVY SNOW ACROSS NRN/ERN MAINE PER RECENT SFC
   OBSERVATIONS. SNOW RATES OF 1-2 IN/HR ARE OCCURRING IN ASSOCIATION
   WITH THIS ACTIVITY...AND WILL LIKELY CONTINUE THROUGH AROUND
   03Z-04Z. THE HIGHEST SNOW RATES WILL OCCUR IN CONJUNCTION WITH
   THUNDERSNOW...WITH LIGHTNING DATA SUGGESTING THE OCCURRENCE OF A
   COUPLE OF CLOUD-TO-GROUND STRIKES DURING THE PAST HOUR OR SO. LATER
   IN THE EVENING...SNOW RATES SHOULD TAPER OFF...AS FORCING FOR ASCENT
   ACCOMPANYING THE SHORTWAVE TROUGH MOVES FARTHER INTO CANADA.
   
   ..COHEN.. 02/28/2013
   
   
   ATTN...WFO...CAR...
   
   LAT...LON   45566887 46066922 46846935 47446914 47266886 47316844
               47356826 47046778 46706778 46066779 45596756 45306764
               45176825 45566887