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ACUS11 KWNS 131616
SPC MCD 131616

Mesoscale Discussion 0119
NWS Storm Prediction Center Norman OK
1116 AM CDT Tue Mar 13 2018

Areas affected...Long Island and coastal New England

Concerning...Heavy snow

Valid 131616Z - 132015Z

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 peak between now and
18-19Z.  Thereafter, lower/mid tropospheric frontogentic 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 for graphic product...


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