MD 0390 CONCERNING HEAVY SNOW FOR PORTIONS OF SOUTHEAST NEBRASKA…SOUTHWEST IOWA…AND FAR NORTHWEST MISSOURI
Mesoscale Discussion 0390
NWS Storm Prediction Center Norman OK
0129 PM CDT Thu Apr 16 2020
Areas affected...Portions of Southeast Nebraska... Southwest
Iowa...and far Northwest Missouri
Concerning...Heavy snow
Valid 161829Z - 162230Z
SUMMARY...Heavy snow with snow rates of 1 to 2 inches per hour
expected to expand eastward this afternoon and evening.
DISCUSSION...Heavy snow has begun to develop in a mesoscale band
located along a sloping warm front from far northern Kansas into
southern Nebraska. Surface obs in the Grand Island and Hastings
vicinity recently reported heavy snow. Afternoon satellite imagery
shows IR cloud tops continuing to cool as previous elevated
convection over north Kansas expands to the north. This is supported
by area RAP and NAM soundings which show ascent associated with 700
and 850 mb frontogenesis and weak elevated instability with MUCAPE
between 50 and 100 J/KG. HREF guidance indicates a favorable zone
for snow rates of 1 to 2 inches per hour developing over southeast
Nebraska and across the Missouri Valley during the next few hours.
Eastward expansion of the heavier snow rates is likely as the upper
trough over the Rockies ejects onto the plains and dendritic growth
layer depth increases later this afternoon.
..Lyons/Grams.. 04/16/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...GID...LBF...
LAT...LON 40319930 41139989 41689877 41729731 41599479 40819415
40359460 40159594 40149759 40319930
from SPC Mesoscale Discussions https://bit.ly/3agP21f
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