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ACUS11 KWNS 100839
SWOMCD
SPC MCD 100839=20
SDZ000-NEZ000-101245-
Mesoscale Discussion 1975
NWS Storm Prediction Center Norman OK
0239 AM CST Fri Dec 10 2021
Areas affected...portions of southwest into south-central SD
Concerning...Heavy snow=20
Valid 100839Z - 101245Z
SUMMARY...A narrow corridor of moderate to heavy snow will continue
to slowly lift northward across parts of southwest into
south-central SD through early morning. Snowfall rates may briefly
reach 1 inch per hour within this narrow snow band.
DISCUSSION...A narrow snow band extending west to east from northern
Fall River to central Tripp County in southern SD will slowly shift
northward the next few hours. This snow band is being driven by
strong warm advection and frontogenesis around 700 mb. Moderate
ascent will continue to overspread the region as a mid/upper
shortwave trough ejects eastward toward the Four Corners and central
Rockies vicinity. However, the dendritic growth zone will remain
somewhat shallow within the area of stronger warm advection and
midlevel frontogenesis, limiting greater snowfall efficiency. This
should temper overall rates, but narrow/brief areas of heavy snow
are possible the next few hours.
..Leitman.. 12/10/2021
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!rAjE0v387Ld-Po-OltmpzOO7hCemnJWAW4K1EhMLaQob4wliyAPPc5E5BBAn-k7kSDaCO-ly$=
for graphic product...
ATTN...WFO...FSD...ABR...LBF...UNR...CYS...
LAT...LON 43010343 43040369 43140391 43270403 43530405 43650398
43680392 43790353 43890252 43760006 43679952 43589921
43309919 43169921 42979947 42940086 42990287 43010343=20
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