ZCZC SPCSWOMCD ALL
ACUS11 KWNS 180332 
SPC MCD 180332 
MNZ000-IAZ000-NEZ000-SDZ000-180500-

Mesoscale Discussion 1780
NWS Storm Prediction Center Norman OK
1032 PM CDT Sat Aug 17 2019

Areas affected...Portions of far southeastern SD...southern
MN...northeastern NE...and northern IA

Concerning...Severe Thunderstorm Watch 593...595...

Valid 180332Z - 180500Z

The severe weather threat for Severe Thunderstorm Watch 593, 595
continues.

SUMMARY...A strong to damaging wind threat may continue eastward out
of Severe Thunderstorm Watch 593 this evening. A new watch has been
issued into southern Minnesota and northern Iowa to address this
potential.

DISCUSSION...A well-organized but small bowing thunderstorm cluster
is progressing east-southeastward around 40 kt across far
southeastern SD as of 0330Z. Multiple strong to severe wind gusts of
55-65 mph have been measured by various observing sites across this
area over the past couple of hours, with KFSD reporting a gust to 47
mph at 0306Z. Although instability gradually decreases with eastward
extent into southern MN and north-central IA, a modestly enhanced
southwesterly low-level jet should aid continued storm organization
and intensity through the remainder of the evening and into the
early overnight hours. Given the ongoing linear convective mode,
strong to damaging winds will likely remain the primary threat.
Additional convective development along a cold front may occur into
parts of northeastern NE into northwestern and west-central IA.

..Gleason/Guyer.. 08/18/2019

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...MPX...DMX...FSD...OAX...LBF...

LAT...LON   42189682 42249922 42439922 42999803 43309729 43609682
            44049677 44339667 44929482 44959417 44799341 44239309
            42189303 42179534 42189682 

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