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SPC MD 1962

MD 1962 CONCERNING SNOW SQUALL FOR PORTIONS OF CENTRAL INTO EASTERN PENNSYLVANIA

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Mesoscale Discussion 1962
NWS Storm Prediction Center Norman OK
0441 PM CST Fri Nov 18 2022

Areas affected...portions of central into eastern Pennsylvania

Concerning...Snow Squall 

Valid 182241Z - 190045Z

SUMMARY...A snow squall continues to move eastward across
Pennsylvania and is expected to continue for a couple more hours.
Brief but sudden bouts of reduced visibility is the primary threat
with this event.

DISCUSSION...A mature snow squall continues to move eastward across
central into eastern Pennsylvania with a history of gusty winds and
with visibility being reduced to a quarter mile. A subtle surface
lee trough and associated cold front continues to advance eastward
across the Hudson Valley, with deep-layer westerly flow
overspreading the region and supporting snow-squall maintenance.
Furthermore, 8+ C/km low-level lapse rates remain in place across
much of the Northeast, with strong 700 mb cold-air advection
preceding the squall. As such, the steep low-level lapse rates
should persist, contributing to snow squall maintenance. The snow
squall should continue for a couple more hours, promoting brief but
a rapid onset of reduced visibility, perhaps down to a quarter mile
in spots.

..Squitieri.. 11/18/2022

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

ATTN...WFO...PHI...BGM...CTP...

LAT...LON   40167596 40207638 40317685 40397705 40727683 41127650
            41217644 41547612 41587546 41467503 41277490 40907500
            40537524 40227562 40167596 

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