Severe thunderstorms brought winds to over seventy mph, ping-pong ball size hail, isolated flooding, along with a tornado to parts of central South Dakota during the afternoon hours.

Flood in HUGHES, SOUTH DAKOTA
From 09-AUG-19 15:40:00 to 09-AUG-19 18:40:00 (CST-6)
Location: BLUNT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Very heavy rain caused flooding over Highway 14 near Blunt. The water depth was 1 to 2 feet in spots disrupting traffic for several hours.

Hail in DEWEY, SOUTH DAKOTA
From 09-AUG-19 12:36:00 to 09-AUG-19 12:36:00 (MST-7)
Location: CHEYENNE AGENCY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JONES, SOUTH DAKOTA
From 09-AUG-19 14:15:00 to 09-AUG-19 14:15:00 (CST-6)
Location: OKATON
Magnitude: 1.50 
Reported by: Public

Large hail with wind gusts over 50 mph caused some crop damage.

Hail in HUGHES, SOUTH DAKOTA
From 09-AUG-19 14:40:00 to 09-AUG-19 14:40:00 (CST-6)
Location: (PIR)PIERRE ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 09-AUG-19 16:40:00 to 09-AUG-19 16:40:00 (CST-6)
Location: OACOMA
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated seventy mph winds knocked over a camper on Interstate-90.

Thunderstorm Wind in SULLY, SOUTH DAKOTA
From 09-AUG-19 13:20:00 to 09-AUG-19 13:20:00 (CST-6)
Location: ONIDA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Winds were estimated at sixty-five mph by a driver on Highway 83.

Hail in JONES, SOUTH DAKOTA
From 09-AUG-19 15:10:00 to 09-AUG-19 15:10:00 (CST-6)
Location: WESTOVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in LYMAN, SOUTH DAKOTA
From 09-AUG-19 15:58:00 to 09-AUG-19 15:59:00 (CST-6)
Location: LOWER BRULE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A tornado touched down briefly in an open area west of Lower Brule with no damage reported.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 09-AUG-19 14:28:00 to 09-AUG-19 14:28:00 (MST-7)
Location: FT PIERRE
Magnitude: 52.00 EG
Reported by: Public

Estimated sixty mph winds along with hail shredded sunflowers along with moving some round hay bales.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 09-AUG-19 14:40:00 to 09-AUG-19 14:40:00 (CST-6)
Location: PIERRE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 09-AUG-19 15:06:00 to 09-AUG-19 15:06:00 (CST-6)
Location: PIERRE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 09-AUG-19 15:30:00 to 09-AUG-19 15:30:00 (CST-6)
Location: DE GREY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 09-AUG-19 14:20:00 to 09-AUG-19 14:20:00 (MST-7)
Location: FT PIERRE
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Newspaper

Severe thunderstorm winds capsized an 18-foot catamaran on Lake Oahe about 8 miles north of Fort Pierre. The two men on the boat had to be rescued and were uninjured.