SPC MD 2245



MD 2245 CONCERNING SNOW SQUALL FOR PORTIONS OF WESTERN NEW YORK INTO FAR NORTHERN PENNSYLVANIA

MD 2245 Image

Mesoscale Discussion 2245
NWS Storm Prediction Center Norman OK
1247 PM CST Tue Dec 31 2019

Areas affected...Portions of western New York into far northern
Pennsylvania

Concerning...Snow Squall 

Valid 311847Z - 312145Z

SUMMARY...Ongoing snow squall will continue east in a modestly
supportive environment, with brief reductions in visibility and
occasional 1.0 inch/hr snowfall rates possible in stronger portions
of the band.

DISCUSSION...A relatively narrow, but heavy band of snow has
organized over the past hour across western portions of New York
into far northwest Pennsylvania, within a confluence zone associated
with a surface low moving east across Quebec. Strong wind gusts and
brief but sharp reductions of visibility have also recently been
reported. Overall deep-layer ascent will sustain the snow squall to
a degree, with modest steepening of the low-level lapse rates ahead
of the squall. Low-level lapse rates however, are relatively modest,
with surface temperatures well above freezing downstream, and
925-950 mb flow maintaining a somewhat parallel component relative
to squall-line orientation. Still, below-freezing profiles and winds
exceeding 25 knots above 925 mb, may compensate to support snow
squall conditions, with brief instances of 1.0 inch/hr snowfall
rates and reduced visibility possible in localized areas.

..Squitieri.. 12/31/2019

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

ATTN...WFO...BGM...BUF...CTP...

LAT...LON   42047898 42697811 43147769 43337659 43657617 44037602
            44177572 43927530 43407516 42577545 41987579 41767669
            41677811 42047898 

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