MESOSCALE DISCUSSION 0042
   NWS STORM PREDICTION CENTER NORMAN OK
   1035 AM CST SUN JAN 18 2009
   
   AREAS AFFECTED...SRN/DOWNEAST ME
   
   CONCERNING...HEAVY SNOW 
   
   VALID 181635Z - 182030Z
   
   WIDESPREAD MODERATE TO LOCALLY HEAVY SNOW ACROSS NEW ENGLAND WILL
   INCREASE IN INTENSITY ACROSS SRN/ERN PORTIONS OF ME THIS AFTERNOON.
   SNOWFALL RATES FROM 1 TO 2 IN/HR WILL BE LIKELY.
   
   MAXIMUM SURFACE PRESSURE FALLS HAVE BECOME CENTERED ALONG WARM FRONT
   ACROSS COASTAL ME...DOWNSTREAM OF INTENSIFYING CYCLONE OVER MA BAY
   AT 16Z. AN INTENSE BAROCLINIC ZONE /CHARACTERIZED BY A SURFACE
   TEMPERATURE GRADIENT OF 45 F OVER 200 NM ACROSS ERN ME/ HAS RESULTED
   IN SUBSTANTIAL LOW-LEVEL WAA /INFERRED BY LARGE CYCLONIC HODOGRAPHS
   IN GRAY AND CARIBOU VAD PROFILERS/ AND SNOWFALL RATES REACHING 1
   IN/HR /PER 16Z METARS IN BRUNSWICK ME AND PROVIDENCE RI/. WAA WILL
   STRENGTHEN AS THE LLJ INTENSIFIES THIS AFTERNOON WITH APPROACH OF
   SHORT WAVE TROUGH /CURRENTLY ROUNDING BASE OF LARGER-SCALE TROUGH
   OVER TN VALLEY/. MORNING MODEL GUIDANCE QPF CORRESPONDINGLY INCREASE
   WITH BOTH GFS/NAM INDICATING PEAK AMOUNTS AROUND 0.50 IN FROM
   21-00Z. ALTHOUGH SURFACE TEMPERATURES MAY WARM ABOVE FREEZING ACROSS
   IMMEDIATE COASTAL AREAS S OF THE US-1 CORRIDOR EAST OF
   ROCKLAND...HIGH SNOW TO LIQUID RATIOS FARTHER INLAND SHOULD RESULT
   IN SNOWFALL RATES OF 1 TO 2 IN/HR BECOMING PREVALENT.
   
   ..GRAMS/DARROW.. 01/18/2009
   
   
   ...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...
   
   LAT...LON   45016699 44576822 43876997 43017080 43237117 43917104
               45136978 46056772 45016699