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Mesoscale Discussion 133
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   Mesoscale Discussion 0133
   NWS Storm Prediction Center Norman OK
   0444 AM CST Tue Jan 24 2017

   Areas affected...Parts of northeastern New York...Vermont...New
   Hampshire...and much of Maine

   Concerning...Winter mixed precipitation 

   Valid 241044Z - 241645Z

   SUMMARY...A mix of freezing rain, sleet, and snow will continue
   moving northward across parts of northeastern New York, Vermont, New
   Hampshire, and much of Maine this morning.

   DISCUSSION...A nearly stacked cyclone just off the Delmarva
   Peninsula as of 1030Z will continue moving northward/northeastward
   off the New England coast this morning. A band of ongoing
   precipitation across much of New england tied to low-level warm air
   advection/ascent will also develop northward across most of Maine
   through the morning hours. A 06Z sounding from GYX revealed an
   elevated warm layer between 800-700 mb, supporting at least some
   melting of frozen hydrometeors aloft. Latest surface observations
   and recent local storm reports across the Mesoscale Discussion area
   indicate freezing rain and sleet are the primary precipitation types
   with the ongoing band. With continued low-level warm air advection
   attendant to a strong (50-60+ kt) 850 mb easterly low-level jet,
   freezing rain will probably become the primary precipitation type
   across NH and much of Maine through the morning hours where a
   shallow near-surface sub-freezing layer will likely remain in place.
   Freezing rain rates in excess of 0.05 inch/hour may occur, with
   higher rates possible in heavier bands. Some sleet accumulations
   will be more probable on the northern/western fringes of the main
   precipitation band where the elevated warm nose is not as strong.
   Precipitation should end from south to north across the discussion
   area as the overall system lifts northward/northeastward.

   ..Gleason.. 01/24/2017


   LAT...LON   42977379 43547452 44337477 45067453 45087169 45357144
               45467092 45867056 46347033 46456905 46396770 45786766
               45586731 44816683 44586716 44086822 43916874 43686960
               43337041 42937074 42827269 42977379 

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