South Dakota Mesoscale Discussion

Areas affected…Portions of eastern SD into west-central and
southwestern MN…far northeastern NE…and far northwestern IA

Concerning…Severe Thunderstorm Watch 593…

Valid 180126Z – 180300Z

The severe weather threat for Severe Thunderstorm Watch 593

SUMMARY…Severe/damaging wind gusts will likely become an
increasing concern across Severe Thunderstorm Watch 593 this
evening. Relatively greater severe wind potential should exist
across southeastern SD and vicinity in the short term (next few

DISCUSSION…A line of storms has congealed along a cold front this
evening across eastern SD into parts of west-central MN. The
southern flank of this line across southeastern SD appears to be
more robust, as strong instability (MLCAPE of 2500-3500 J/kg) is
present across this region. A 30-35 kt southwesterly low-level jet
is expected to strengthen over eastern NE into southeastern SD and
vicinity, which will likely maintain storm intensity through the
remainder of the evening. Strong inbound velocities have recently
been noted on the KFSD radar with storms approaching Sioux Falls SD,
with evidence of a rear inflow jet developing. A corridor of severe,
damaging winds with gusts of 60-75 mph appears increasingly likely
across southeastern SD and vicinity. Isolated large hail may also
occur with supercells embedded within the line. Farther north,
isolated damaging winds will remain possible into
west-central/southwestern MN, but instability does decrease with
northward extent across Severe Thunderstorm Watch 593.

..Gleason.. 08/18/2019

…Please see for graphic product…


LAT…LON 43049943 44029904 44439841 44899711 45399623 46089587
46069491 44969486 43749499 42699538 42359628 42379754
42709879 43049943

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