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000
ACUS11 KWNS 130556
SWOMCD
SPC MCD 130555
MEZ000-131200-

Mesoscale Discussion 0174
NWS Storm Prediction Center Norman OK
1155 PM CST Sun Feb 12 2017

Areas affected...portions of southern and eastern Maine

Concerning...Heavy snow

Valid 130555Z - 131200Z

SUMMARY...Heavy snowfall rates (1-2 inches per hour) are expected to
become more widespread during the overnight period across southern
and eastern portions of Maine.

DISCUSSION...Bombogenesis of a Nor`easter east of the New England
coast is underway as very rapid surface pressure falls occur during
the 06-12 UTC period as a low deepens from 992 mb to 980 mb.  Very
strong but intensifying deep-layer upward vertical motion will
promote increasing snowfall rates across southern and eastern Maine.
The heaviest snowfall rates are forecast to coincide when mid-level
forcing maximizes after the end of the discussion period (12-18
UTC).  Yet, snow to liquid equivalent ratios of at least 12:1 will
couple with the strengthening ascent and precipitable water and
yield snowfall rates ranging from near 1 inch per hour around 06 UTC
to 1-2 inches per hour primarily after 09 UTC.

..Smith.. 02/13/2017

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

ATTN...WFO...CAR...GYX...

LAT...LON   44967043 45976784 44716680 43517031 44967043




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