Storm Prediction Center Mesoscale Discussion 40

   Mesoscale Discussion 0040
   NWS Storm Prediction Center Norman OK
   0923 PM CST Sun Jan 19 2025

   Areas affected...Coastal Maine

   Concerning...Heavy snow 

   Valid 200323Z - 200930Z

   SUMMARY...Heavy snowfall with rates at or exceeding 1"/hour are
   expected across coastal Maine through 09Z as a surface cyclone
   tracks northeastward off the coast of New England.

   DISCUSSION...As a rapidly deepening surface low tracks northeastward
   off the coast of New England, strong isentropic ascent and lift in
   the dendritic growth zone will result in heavy snowfall across
   portions of coastal Maine. Short-term guidance from the 00Z HREF,
   along with surface pressure falls in recent observations, have
   increased confidence that some areas on the coast could meet or
   exceed 1"/hour snowfall rates. The greatest chance for heavy
   snowfall rates will be north and east of Rockland, and the
   combination of strong winds and heavy snowfall rates will result in
   low visibility conditions (at or below 0.5 mi). These conditions are
   expected to subside in southern Maine starting around 06Z, and
   exiting northeast Maine by 08-09Z.

   ..Halbert.. 01/20/2025

   ...Please see www.spc.noaa.gov for graphic product...

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

   LAT...LON   44217093 44517034 44936946 45416838 45336758 45086701
               44776675 44396714 44026793 43726904 43606987 43147044
               43007066 43197106 43487131 44027122 44217093