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Mesoscale Discussion 221
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   Mesoscale Discussion 0221
   NWS Storm Prediction Center Norman OK
   0226 PM CDT Mon Mar 23 2020

   Areas affected...Portions of New England

   Concerning...Heavy snow 

   Valid 231926Z - 240130Z

   SUMMARY...Snowfall rates of near 1 inch per hour are possible this
   afternoon through perhaps mid-evening. Heaviest snowfall is expected
   to occur during 8 PM EDT to 11 PM EDT period.

   DISCUSSION...An approaching mid-level trough has induced a deepening
   frontal wave cyclone along a remnant cold frontal boundary off the
   Mid-Atlantic coast. Pressure falls of 4-5 mb over the last 2 hours
   have been observed off the NJ/Long Island coasts indicating that the
   surface low is in the process of shifting to the north and
   deepening. During the afternoon, strong mid-level ascent will
   overlap with strong 850 mb WAA across parts of New England. A
   deformation band within central/eastern New York will eventually
   merge with ongoing WAA precipitation within southern/central New
   England. Snowfall rates of near 1 inch per hour will be possible
   into early to mid-evening. The southern extent of higher snowfall
   rates is where the most uncertainty lies as strong low-level WAA
   will tend to warm the profile and transition precipitation to rain.
   Some areas will remain above freezing until wet bulb effect will
   drop temperatures to at or just below freezing.

   ..Wendt.. 03/23/2020

   ...Please see for graphic product...


   LAT...LON   42127446 42577540 42637543 42637544 42807551 43597526
               44427431 44727326 44797176 44537036 44036969 43457012
               42687068 42357186 42097249 41957356 42127446 

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