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SPC MD 1967


MD 1967 Image

Mesoscale Discussion 1967
NWS Storm Prediction Center Norman OK
1232 AM CST Sun Nov 20 2022

Areas affected...portions of northwestern New York

Concerning...Heavy snow 

Valid 200632Z - 201200Z

SUMMARY...Heavy snow is expected to become gradually more common as
a primary snow band begins to overspread more inland areas. At least
2-3 inch/hr snowfall rates are possible. The heavy snow will peak in
the 08-12Z/3-7 AM EST time frame.

DISCUSSION...Mainly light to moderate snow has been falling across
Jefferson into western St. Lawrence Counties in Upstate NY over the
past several hours. However, as the upper trough and associated 700
mb cold-air advection begins to overspread the northern Hudson
Valley, low-level lapse rates will further steepen into the 7-8 C/km
range while deep-layer ascent also increases. Latest KTYX radar data
suggests that the primary snow band emanating off of Lake Ontario is
already undergoing intensification and this trend should continue
through the remainder of the night. 2-3 inch/hr snowfall rates are
possible in the more intense portions of the band, mainly from
northern Lewis County over the next few hours, and then points
farther south closer to sunrise. An instance or two of 4 inch/hr
snowfall rates cannot be ruled out. In addition, reduced visibility
and dangerous travel conditions are expected to accompany the more
intense portions of the snow band.

..Squitieri.. 11/20/2022

...Please see for graphic product...


LAT...LON   43557636 43967612 44387583 44547547 44477524 44237509
            43897510 43547521 43377537 43287556 43337605 43557636 

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