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Mesoscale Discussion 132
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   Mesoscale Discussion 0132
   NWS Storm Prediction Center Norman OK
   1048 PM CST Mon Jan 23 2017

   Areas affected...Portions of Maine...VT...NH...and northeastern NY

   Concerning...Winter mixed precipitation 

   Valid 240448Z - 241045Z

   SUMMARY...Areas of winter mixed precipitation will continue to
   spread northward during the overnight hours into early Tuesday

   DISCUSSION...Areas of sleet, freezing rain, and snow -- addressed in
   Mesoscale Discussion 131 -- will continue to spread northward across
   portions of New England and northeast NY through the overnight hours
   and continue into early Tuesday morning. This winter mixed
   precipitation has already become widespread across portions of
   central and eastern New York into adjacent parts of western New
   England -- in association with the warm conveyor and deformation
   structures accompanying a deep cyclone advancing northward near the
   Atlantic Coast. In many areas, temperatures marginally above
   freezing within an elevated warm layer -- e.g., sampled by the 00Z
   Albany sounding -- and notably elevated dendritic growth zones
   (relative to the strongest ascent in the profile) will support sleet
   and freezing rain, given sub-freezing wet-bulb surface temperatures
   across the area. Freezing-rain rates around 0.02-0.04 inch per hour,
   and sleet-accumulation rates locally reaching around 0.05-0.10 inch
   per hour, will be possible. Deeper cold air/subfreezing profiles may
   tend to favor snow in some areas -- e.g., from parts of northeast NY
   eastward toward central Maine. Snowfall rates of 0.5 inch to locally
   1 inch per hour may accompany this activity.

   ..Cohen.. 01/24/2017


   LAT...LON   44556864 43677026 43177069 42827120 42717163 42867200
               43397257 43647411 44027425 44677337 44897206 44996979

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