MESOSCALE DISCUSSION 0312
   NWS STORM PREDICTION CENTER NORMAN OK
   0725 AM CST SAT MAR 01 2008
   
   AREAS AFFECTED...NH/MAINE
   
   CONCERNING...HEAVY SNOW 
   
   VALID 011325Z - 011830Z
   
   MODERATE/HEAVY SNOW IS EXPECTED TO SPREAD ACROSS MUCH OF NH INTO
   CENTRAL/COASTAL MAINE THROUGH EARLY AFTERNOON...WITH LOCALIZED RATES
   OF 1-2 IN/HR.
   
   WATER VAPOR IMAGERY FEATURES A NEARLY VERTICALLY STACKED
   CYCLONE...WITH A 1008 MB SURFACE LOW AS OF 13Z...SHIFTING EASTWARD
   ACROSS FAR EASTERN ONTARIO AT DAYBREAK. AMPLE DOWNSTREAM PRESSURE
   FALLS ARE ONGOING ACROSS MUCH OF NEW ENGLAND...WITH MODERATE/LOCALLY
   HEAVY SNOW BECOMING MORE COMMON OVER THE PAST 1-2 HOURS ACROSS
   PORTIONS OF SOUTHERN VT/SOUTHERN NH INTO FAR WESTERN COASTAL MAINE.
   AS THE MID LEVEL WAVE BECOMES PROGRESSIVELY CLOSED THROUGH
   MIDDAY...06Z NAM/GFS AND 09Z RUC/SREF GUIDANCE IMPLY AN INCREASING
   SNOW INTENSITY THIS MORNING...WITH A DOWNSTREAM SPREAD OF
   MODERATE/HEAVY SNOW ACROSS MUCH OF CENTRAL/COASTAL MAINE. WITHIN
   THIS CORRIDOR...06Z NAM/09Z RUC FORECAST SOUNDINGS DEPICT A SEVERAL
   HOUR PERIOD OF AMPLE DEEP LAYER OMEGA COINCIDENT WITH A FAVORABLE
   DENDRITIC GROWTH LAYER. FURTHERMORE...INCREASINGLY STEEP MID LEVEL
   LAPSE RATES/MODEST SLANTWISE INSTABILITY WILL CONTRIBUTE TO ENHANCED
   SNOW RATES ACROSS CENTRAL/COASTAL MAINE BETWEEN 15Z-21Z...WITH
   LOCALIZED RATES LIKELY TO REACH 1.5-2.0 IN/HR.
   
   ..GUYER.. 03/01/2008
   
   
   ...NOTICE...
   SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
   SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
   TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
   FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
   
   ATTN...WFO...CAR...GYX...
   
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