|Mesoscale Discussion 174|
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Mesoscale Discussion 0174
NWS Storm Prediction Center Norman OK
1155 PM CST Sun Feb 12 2017
Areas affected...portions of southern and eastern Maine
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.
LAT...LON 44967043 45976784 44716680 43517031 44967043
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