MESOSCALE DISCUSSION 2113
   NWS STORM PREDICTION CENTER NORMAN OK
   0347 AM CST TUE DEC 29 2015

   AREAS AFFECTED...MUCH OF MAINE

   CONCERNING...HEAVY SNOW 

   VALID 290947Z - 291545Z

   SUMMARY...HEAVY SNOW WILL OVERSPREAD MUCH OF MAINE DURING THE
   PRE-DAWN AND EARLY-MORNING HOURS...AND CONTINUE THROUGH THE MORNING.
   SNOWFALL RATES OF 1-2 INCHES PER HOUR WILL BE LIKELY...AND RATES
   COULD LOCALLY EXCEED 2 INCHES PER HOUR. AREAS OF SLEET WILL LIKELY
   DEVELOP NWD THROUGH PARTS OF SRN MAINE DURING THE MORNING HOURS...AS
   WELL.

   DISCUSSION...SNOW WILL INCREASE IN COVERAGE AND INTENSITY ACROSS
   MUCH OF MAINE DURING THE PRE-DAWN/EARLY-MORNING HOURS...SPREADING
   FROM WSW TO ENE...WITH HEAVY SNOW BECOMING COMMON IN THE 11Z-15Z
   TIME FRAME. MOSAIC RADAR LOOPS INDICATE A WIDESPREAD SHIELD OF
   PRECIPITATION SPREADING ENEWD...EXTENDING FROM THE MID-ATLANTIC TO
   CNTRL/SRN NEW ENGLAND. THIS ACTIVITY IS ASSOCIATED WITH THE
   WARM-CONVEYOR STRUCTURE WELL E OF A COMPACT MID-LEVEL CYCLONE
   CROSSING THE GREAT LAKES AREA. AS ASSOCIATED DEEP AND STRONG
   FRONTOGENETIC CIRCULATIONS CROSS MAINE...AND RELATED ASCENT
   INTERSECTS DEEP DENDRITIC GROWTH ZONES...HEAVY SNOW IS ANTICIPATED.
   SNOWFALL RATES OF 1-2 INCHES PER HOUR WILL BE LIKELY. 

   THE MOST HEAVY-SNOW-FAVORABLE OVERLAP OF RICHER DEEP MOISTURE AND
   STRONG DEEP ASCENT AMIDST DEEP SUB-FREEZING AIR IS EXPECTED ACROSS
   PARTS OF CNTRL MAINE -- ESPECIALLY FROM THE AUGUSTA AREA ENEWD
   THROUGH THE BANGOR AREA TOWARD BAR HARBOR AND HOULTON. THIS IS WHERE
   SNOWFALL RATES IN EXCESS OF 2 INCHES PER HOUR WILL BE POSSIBLE THIS
   MORNING.

   HEAVY SNOW WILL LIKELY CONTINUE ACROSS MUCH OF THE AREA THROUGH THE
   MORNING HOURS. HOWEVER...ELEVATED WARM ADVECTION AND RELATED PARTIAL
   MELTING OF DESCENDING HYDROMETEORS /REFREEZING WITHIN THE UNDERLYING
   SUB-FREEZING PBL/ WILL HAVE THE POTENTIAL TO SUPPORT SLEET ACROSS
   PARTS OF SRN MAINE INCLUDING THE PORTLAND AREA LATER THIS
   MORNING...PARTICULARLY AROUND/AFTER THE 15Z-16Z TIME FRAME.
   SLEET-ACCUMULATION RATES AROUND ONE-QUARTER INCH PER HOUR -- LOCALLY
   HIGHER -- MAY ACCOMPANY THIS ACTIVITY...WITH THE POTENTIAL FOR SLEET
   DEVELOPING NWD ACROSS PARTS OF SRN MAINE.

   ..COHEN.. 12/29/2015


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

   LAT...LON   44536750 43636999 43317055 44287091 45277094 45877036
               46806981 47136890 46806788 45846772 44926701 44536750