Several thunderstorms rolled across central South Dakota bringing hail up to the size of golf balls, severe winds up to 70 mph, along with flash flooding in the Pierre/Fort Pierre area.

Flash Flood in HUGHES, SOUTH DAKOTA
From 21-AUG-17 07:50:00 to 21-AUG-17 10:45:00 (CST-6)
Location: PIERRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Very heavy rains of 1.5 to 3.5 inches falling over a short period of time brought flash flooding to Pierre during the morning hours. There was flooding over several roads along with man hole covers coming off. The flash flooding resulted in stalled vehicles along with the flooding of some businesses and homes. Some vehicles became stalled with a few rescues occurring. Several areas were barricaded to prevent further stranded vehicles.

Flash Flood in STANLEY, SOUTH DAKOTA
From 21-AUG-17 07:00:00 to 21-AUG-17 09:45:00 (MST-7)
Location: FT PIERRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Very heavy rains of 1 to 3 inches falling over a short period of time brought flash flooding to Fort Pierre during the morning hours. Several roads were flooded including parts of Highways 34 and 14 being blocked off due to water over the road. A few homes and businesses received flooding with several vehicles stalled.

Hail in DEWEY, SOUTH DAKOTA
From 21-AUG-17 03:45:00 to 21-AUG-17 03:45:00 (MST-7)
Location: THATCHER
Magnitude: 1.75 
Reported by: Public

Hail in SULLY, SOUTH DAKOTA
From 21-AUG-17 05:36:00 to 21-AUG-17 05:36:00 (CST-6)
Location: GALLAGHER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SULLY, SOUTH DAKOTA
From 21-AUG-17 05:40:00 to 21-AUG-17 05:40:00 (CST-6)
Location: GALLAGHER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CODINGTON, SOUTH DAKOTA
From 21-AUG-17 06:38:00 to 21-AUG-17 06:38:00 (CST-6)
Location: (ATY)WATERTOWN ARPT
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in STANLEY, SOUTH DAKOTA
From 21-AUG-17 06:58:00 to 21-AUG-17 06:58:00 (MST-7)
Location: FT PIERRE
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 21-AUG-17 08:20:00 to 21-AUG-17 08:20:00 (CST-6)
Location: MC CLURE
Magnitude: 1.50 
Reported by: Public

Hail in STANLEY, SOUTH DAKOTA
From 21-AUG-17 07:30:00 to 21-AUG-17 07:30:00 (MST-7)
Location: FT PIERRE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 21-AUG-17 09:20:00 to 21-AUG-17 09:20:00 (CST-6)
Location: LYMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 21-AUG-17 09:45:00 to 21-AUG-17 09:45:00 (CST-6)
Location: OACOMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 21-AUG-17 09:20:00 to 21-AUG-17 09:20:00 (CST-6)
Location: LYMAN
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Public

Sixty-five mph winds downed several large tree branches.

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 21-AUG-17 08:01:00 to 21-AUG-17 08:01:00 (CST-6)
Location: DRAPER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Seventy mph winds were estimated.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 21-AUG-17 08:41:00 to 21-AUG-17 08:41:00 (CST-6)
Location: VIVIAN
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet