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Mesoscale Discussion 1967
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MD 1967 graphic

   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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