SPC MD 2244



MD 2244 CONCERNING HEAVY SNOW FOR PORTIONS OF NORTHERN MAINE

MD 2244 Image

Mesoscale Discussion 2244
NWS Storm Prediction Center Norman OK
0905 AM CST Tue Dec 31 2019

Areas affected...Portions of northern Maine

Concerning...Heavy snow 

Valid 311505Z - 312100Z

SUMMARY...Increasing snowfall rates are possible across northern
Maine with the approach of an intensifying surface low. Up to 1.0
inch/hr rates may occur in the stronger bands later this morning
into the afternoon hours.

DISCUSSION...A broad band of moderate to occasionally heavy snow is
in progress across portions of northeast Maine into New Brunswick in
association with 700 mb warm-air and moisture advection. This
initial band will foster heavy snow potential (including brief
periods of 1 inch/hr rates) in the near-term. However, deepening of
the surface low, currently located just offshore of New Hampshire,
is expected, along with a northward track. Strong 925-850 mb
warm-air and moisture advection are expected to accompany the
approaching low, along with ample low-level frontogenesis. As such,
strong lift of relatively deeper moisture, in a well-below freezing
tropospheric profile, suggest that efficient dendrite production is
likely, with snowfall rates occasionally reaching up to 1.0 inch/hr
into the afternoon. This scenario is also supported by latest
high-resolution model guidance, including 12Z HREF and some of the
latest HRRR runs, with 1.0 inch/hr rates depicted mainly within the
17-22Z period.

..Squitieri.. 12/31/2019

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

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

LAT...LON   45876782 45946863 45996928 46216967 46606967 47136929
            47206870 47346834 47226799 46996781 45876782 

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