A cold front during the late afternoon and early evening hours slashed into an unstable airmass with 2000-3000 J/kg MLCAPE and 30-35 knots of 0-6 km shear. Scattered thunderstorms developed with the thick CAPE profile supportive of large hail and over 1000 J/kg DCAPE resulting in occasional damaging wind.

Flash Flood in SANBORN, SOUTH DAKOTA
From 26-JUN-20 07:30:00 to 26-JUN-20 08:30:00 (CST-6)
Location: ARTESIAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Water flowed over 418th Avenue to a depth of 6 to 12 inches.

Hail in BRULE, SOUTH DAKOTA
From 25-JUN-20 15:22:00 to 25-JUN-20 15:24:00 (CST-6)
Location: BIJOU HILLS
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 25-JUN-20 15:31:00 to 25-JUN-20 15:33:00 (CST-6)
Location: LYONVILLE
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in CHARLES MIX, SOUTH DAKOTA
From 25-JUN-20 15:33:00 to 25-JUN-20 15:35:00 (CST-6)
Location: ACADEMY
Magnitude: 52.00 MG
Reported by: Trained Spotter

Wind gust to 60 mph measured by a personal weather station.

Thunderstorm Wind in DAVISON, SOUTH DAKOTA
From 25-JUN-20 16:35:00 to 25-JUN-20 16:37:00 (CST-6)
Location: (MHE)MITCHELL ARPT
Magnitude: 57.00 MG
Reported by: ASOS

Automated weather station KMHE 3 miles north of Mitchell measured a peak wind gust of 66 mph.

Thunderstorm Wind in DAVISON, SOUTH DAKOTA
From 25-JUN-20 16:49:00 to 25-JUN-20 16:51:00 (CST-6)
Location: (MHE)MITCHELL ARPT
Magnitude: 51.00 MG
Reported by: ASOS

Automated weather station KMHE 3 miles north of Mitchell measured a wind gust of 59 mph.

Thunderstorm Wind in HANSON, SOUTH DAKOTA
From 25-JUN-20 16:55:00 to 25-JUN-20 16:56:00 (CST-6)
Location: ALEXANDRIA
Magnitude: 57.00 MG
Reported by: Mesonet

South Dakota RWIS station SD502 4 miles east northeast of Alexandria measured a wind gust of 66 mph.

Hail in CHARLES MIX, SOUTH DAKOTA
From 25-JUN-20 15:38:00 to 25-JUN-20 15:41:00 (CST-6)
Location: ACADEMY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in AURORA, SOUTH DAKOTA
From 25-JUN-20 15:49:00 to 25-JUN-20 15:50:00 (CST-6)
Location: WHITE LAKE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in MINNEHAHA, SOUTH DAKOTA
From 25-JUN-20 19:02:00 to 25-JUN-20 19:04:00 (CST-6)
Location: ELLIS
Magnitude: 0.75 
Reported by: Public

Hail in MINNEHAHA, SOUTH DAKOTA
From 25-JUN-20 19:21:00 to 25-JUN-20 19:22:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 0.75 
Reported by: Public

Flash Flood in KINGSBURY, SOUTH DAKOTA
From 26-JUN-20 03:00:00 to 26-JUN-20 04:00:00 (CST-6)
Location: DE SMET
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water flowed rapidly to a foot depth over Highway 25 at 215th Street.

Flash Flood in KINGSBURY, SOUTH DAKOTA
From 25-JUN-20 23:01:00 to 26-JUN-20 02:00:00 (CST-6)
Location: ESMOND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Deputy came across deep water flowing across the road.  The full depth was unknown, but it was deep enough to force the deputy to turn around.

Thunderstorm Wind in MCCOOK, SOUTH DAKOTA
From 25-JUN-20 17:44:00 to 25-JUN-20 17:45:00 (CST-6)
Location: MONTROSE
Magnitude: 60.00 MG
Reported by: Mesonet

South Dakota RWIS station SD547 3 miles southeast of Montrose measured a wind gust of 69 mph.