South Dakota Mesoscale Discussion

Areas affected…south-central South Dakota into central Nebraska

Concerning…Severe Thunderstorm Watch 557…

Valid 070324Z – 070530Z

The severe weather threat for Severe Thunderstorm Watch 557

SUMMARY…A corridor of very large hail and damaging wind potential
stretches from south-central South Dakota into central Nebraska.

DISCUSSION…A cluster of supercells continues to travel
south-southeastward along the MO River in southern SD, within a weak
surface trough and along an instability gradient where modest warm
advection exists at 850 mb. West of the primary cluster, several
smaller cells were affecting far northern NE, with indications of
marginally severe hail.

The 00Z LBF sounding shows strong instability along with a long,
straight hodograph and minimal capping potential given mid to upper
60s F dewpoints. As 850 mb winds remain out of the southwest, the
cluster of supercells is likely to persist for several hours, with
damaging hail and wind possible into central NE.

..Jewell.. 08/07/2019

…Please see for graphic product…


LAT…LON 43269970 43459943 43519904 43179879 42699852 42029823
41349801 41019816 40899860 40909932 41239963 41939963
42639965 43269970

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