MD 1963 CONCERNING HEAVY SNOW FOR PORTIONS OF FAR SOUTHWESTERN NEW YORK
Mesoscale Discussion 1963
NWS Storm Prediction Center Norman OK
0528 PM CST Fri Nov 18 2022
Areas affected...portions of far southwestern New York
Valid 182328Z - 190130Z
SUMMARY...1-2 inch/hr snowfall rates should continue for at least a
couple more hours, with dangerous travel conditions persisting.
DISCUSSION...A long-lived lake-effect snow band continues to promote
1-2 inch/hr snowfall rates across areas immediately east of Lake
Erie as deep-layer ascent continues overhead with the passage of a
surface lee trough. These heavier snowfall rates should continue for
a couple more hours given the persistence of steep low-level lapse
rates. In a few more hours, as the aforementioned lapse rates become
more shallow, a gradual lessening of snowfall rates may follow.
However, deep-layer flow fields should continue to parallel the long
axis of Lake Erie, promoting a continued deep fetch of moisture with
the ongoing snow band. As such, at least light to moderate snowfall
rates and occasionally gusty conditions should continue into
tonight, with travel conditions remaining dangerous.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 42297964 42577918 42787889 42907845 42957812 42897798
42787793 42557808 42457846 42267882 42177916 42147950