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ACUS11 KWNS 131108
SPC MCD 131108

Mesoscale Discussion 0118
NWS Storm Prediction Center Norman OK
0608 AM CDT Tue Mar 13 2018

Areas affected...RI and eastern MA

Concerning...Heavy snow

Valid 131108Z - 131715Z

SUMMARY...Heavy snowfall rates ranging from 1-3 inches per hour are
expected to develop through 17Z (1PM EDT).  The heaviest band of
snow will seemingly become established from RI north-northeast
through the Boston Metro.

DISCUSSION...Radar mosaic as of 11Z (7AM EDT) shows a band of heavy
snow located from 50 miles southeast of Islip, NY, to Providence,
RI, and 100 miles east-southeast of Portland, ME.  This band is
forecast to gradually pivot northwest over Boston this morning while
remaining largely stationary over RI.  As a negatively tilted
mid-level trough moves across southern New England, a deep-layer of
strongly forced ascent (DCVA) will become favorably juxtaposed in
time/space with precipitable water around 0.50 inch.  As the deep
frontogenetic circulation strengthens, hourly rates are expected to
increase from 1-2 inches per hour to primarily in the 2-3 inches per
hour.  Localized/intermittent blizzard conditions will likely occur
over Cape Cod and on the immediate coast.

..Smith.. 03/13/2018

...Please see for graphic product...


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