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Mesoscale Discussion 134
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   Mesoscale Discussion 0134
   NWS Storm Prediction Center Norman OK
   1112 AM CST Tue Jan 24 2017

   Areas affected...Much of Maine and vicinity

   Concerning...Winter mixed precipitation 

   Valid 241712Z - 242315Z

   SUMMARY...A mix of winter precipitation -- ranging from
   sleet/freezing rain to the south and snow to the north -- will
   continue shifting northward/northwestward across northern New
   England today.

   DISCUSSION...Latest radar loop shows widespread wintry precipitation
   across central and northern Maine at this time, with scattered
   patches of winter precipitation farther west and south.  Meanwhile,
   temperatures across southern New England -- outside of
   isolated/higher terrain locales and protected valleys -- continue to
   rise above freezing.

   The precipitation is being supported by strong ascent driven by
   intense warm advection, as a 60 kt easterly/east-southeasterly
   low-level jet is observed to the north of a vertically-stacked low
   now residing off the mid-Atlantic coast and shifting slowly
   north-northeastward with time.

   Snow continues to fall across northern and western portions of Maine
   at this time, where low-level warm advection has not yet pushed
   temperatures above freezing in the lower troposphere.  Rates
   averaging 1/2" to locally 1" per hour will persist into the
   afternoon, though an eventual changeover to sleet/freezing rain is
   expected from south to north as warm advection persists.

   Farther south and east across Maine, temperatures remain below
   freezing at the surface at this hour, away from coastal areas. 
   However, an above-freezing warm nose in a roughly 850 mb to 700 mb
   layer (as revealed by the morning GYX RAOB and progged by point
   soundings from the models) is yielding a mix of freezing rain and
   sleet, with substantial accumulations occurring in some areas
   (reports of 1.5" of sleet accumulation, and .25" freezing rain
   accretion have been received).

   The heaviest band of precipitation is now occurring across central
   Maine, including Piscataquis, Penobscot, southern Aroostook, and
   Washington counties.  The latest MLT observation (Millinocket
   Municipal Airport) has transitioned from snow to freezing rain in
   the past 90 minutes or so, reflective of the expected precipitation
   trend across central and northern Maine through the afternoon hours.

   ..Goss.. 01/24/2017


   LAT...LON   45236693 44846736 45006813 44886918 44847023 45037090
               45287085 46777006 47546914 47466830 47086760 45736768
               45556732 45236693 

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