South Dakota Mesoscale Discussion

Areas affected…eastern Nebraska…far southeast South
Dakota…northwest Iowa…southern Minnesota

Concerning…Heavy snow

Valid 262323Z – 270530Z

SUMMARY…Heavy snow will continue and develop across parts of
eastern Nebraska into southern Minnesota as the surface low tracks
northeast. Snowfall rates of 1-2 inches per hour are likely tonight.

DISCUSSION…A strong surface cyclone is deepening over the central
Plains under a strong upper-level shortwave trough. An associated
surface low situated in eastern Kansas will track along falling
pressure to the northeast as the upper-level trough moves into the
Midwest tonight. Isentropic lift and frontogenesis will continue to
the north of the surface low with the greatest overlap stretching
from eastern Nebraska through northwest Iowa into southern
Minnesota. Additionally, mid-level lapse rates of 7-8 C/km will
result in instability in the dendritic growth zone and isolated
lightning. Overall, 1-2 inches per hour snowfall rates are expected
with 15-25 mph sustained surface winds.

..Nauslar/Grams.. 11/26/2019

…Please see for graphic product…


LAT…LON 40559746 40329798 40379919 41449907 42489858 43899719
44469574 44659452 44679356 44469300 44149288 43839288
43519308 43219365 43009419 42659484 42329548 41279669

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