ACUS11 KWNS 190026
SWOMCD
SPC MCD 190025=20
SDZ000-190230-

Mesoscale Discussion 1990
NWS Storm Prediction Center Norman OK
0725 PM CDT Mon Aug 18 2025

Areas affected...South Dakota

Concerning...Severe Thunderstorm Watch 600...

Valid 190025Z - 190230Z

The severe weather threat for Severe Thunderstorm Watch 600
continues.

SUMMARY...Isolated severe thunderstorms will linger this evening.

DISCUSSION...Weak short-wave trough has topped the ridge and is
digging southeast across eastern ND/northern SD. This feature
appears to be aiding isolated thunderstorms across northwestern SD
early this evening. Latest surface analysis suggests this activity
trails the main wind shift, but is digging southeast within a steep
lapse-rate environment characterized by MLCAPE on the order of 2000
J/kg. Even so, MRMS data suggests hail cores have weakened a bit
over the last half hour or so. Hail and wind continue to be a
concern with these isolated robust updrafts.

..Darrow.. 08/19/2025

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!8OL_EgctHHdCLqbzA0oZDo4YiW8eyARNAkeLcVfbMd_CVLSWJ03VBrVatlk4u6m2_O_RE-Ldk= FZrhmcFvwkzvtWEduA$ for graphic product...

ATTN...WFO...ABR...UNR...

LAT...LON 43280331 45740332 45779972 43319971 43280331=20

MOST PROBABLE PEAK WIND GUST...65-80 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN


=3D =3D =3D
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