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Mesoscale Discussion 41 |
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Mesoscale Discussion 0041
NWS Storm Prediction Center Norman OK
0439 PM CST Mon Jan 20 2025
Areas affected...portions of far western New York
Concerning...Heavy snow
Valid 202239Z - 210245Z
SUMMARY...Instances of heavy lake-effect snow should continue
through the evening, with 2 inch/hour snowfall rates possible,
especially over Erie County, New York.
DISCUSSION...Deep-layer flow (especially closer to the surface) has
become more aligned with the long axis of Lake Erie over the past
couple of hours given the passing of a weak surface trough. The long
fetch of appreciable low-level moisture off of the lake waters will
support lake effect snow into the evening hours. 6-7 C/km low-level
lapse rates (evident via 22Z mesoanalysis) will support continued
heavier snowfall (as was recently observed at the DKK ASOS), with
snowfall rates potentially approaching 2 inches/hour at times.
..Squitieri.. 01/20/2025
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BUF...
LAT...LON 42667911 42767897 42817890 42907887 42927861 42777847
42617851 42527878 42517889 42577899 42667911
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