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Mesoscale Discussion 119
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   Mesoscale Discussion 0119
   NWS Storm Prediction Center Norman OK
   1242 PM CDT Tue Mar 13 2018

   Areas affected...Long Island and coastal New England

   Concerning...Heavy snow 

   Valid 131742Z - 132015Z

   CORRECTED TYPO/WORDING IN DISCUSSION

   SUMMARY...Heavy snow rates, at times on the order of 2-3+ inches per
   hour within a couple of narrow bands, appear in the process of
   peaking across parts of Long Island and southeastern New England
   early this afternoon.  This may begin to diminish by 2-3 PM EDT, but
   1 inch per hour snow rates may linger within a corridor across
   southern coastal Maine/New Hampshire and the Boston metro area
   through 5-6 PM EDT.

   DISCUSSION...To the southeast of Cape Cod, the center of the deep
   surface cyclone appears in the process of redeveloping eastward,
   much as indicated by the latest Rapid Refresh, before it migrates
   northeastward toward areas near/southeast of the Novia Scotia coast
   by early evening.  As this occurs, one narrow but persistent heavy
   snow band extending from the Vermont/New Hampshire border area into
   central and eastern Long Island may diminish within the next few
   hours, while snow rates within the primary band to the east peak
   across parts of eastern Connecticut/Rhode Island into the Boston
   metropolitan area and coastal southern Maine between now and 18-19Z.
   Thereafter, lower/mid tropospheric frontogenetic forcing is forecast
   to weaken.  However, lift within the dendritic growth layer
   (supported by lower/mid-level warm advection) may remain strong
   enough to maintain sustained lingering heavy snow rates in excess of
   1 inch per hour across the Boston metro and coastal southern Maine
   through at least 21-22Z.

   ..Kerr.. 03/13/2018

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

   ATTN...WFO...CAR...GYX...BOX...OKX...

   LAT...LON   43506988 42407059 41617141 40867217 41457224 42467168
               42887125 43937054 44396987 44466906 44066866 43506988 

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Page last modified: March 13, 2018
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