A strengthening low-level jet produced lift at the top of a developing capping inversion, with up to 1000 J/kg MUCAPE and effective shear up to 30 knots. Isolated intense updrafts resulted in spotty large hail.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FSD wrote it up.
A strengthening low-level jet produced lift at the top of a developing capping inversion, with up to 1000 J/kg MUCAPE and effective shear up to 30 knots. Isolated intense updrafts resulted in spotty large hail.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sioux Falls, SD wrote its last area forecast discussion before the first event at Jun 6, 3:52 AM CST, 1 hour 35 minutes earlier.
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</html>The Sioux Falls radar (KFSD), 159 km away, was scanning. The volume nearest the first event began at 11:27 UTC.
2 hail. Local standard time, as filed.
Falling hail was mostly pea sized, but several stones were as large as nickels.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2020Every state in 2020This day in weather historyWarnings in South Dakota, June 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 905164, 905165.