Thunderstorms developed along a cold front brought severe weather to central South Dakota during the evening hours. A storm moved into Pierre and Fort Pierre, SD, producing hail. There were numerous reports of baseball-sized hail across the area, and even one larger than a softball, with an estimated diameter of 5.0 inches. The hailstone is the largest on record in Hughes County (4.0 in Pierre on 6/30/1997 and Blunt on 8/26/2018). Damage was done to vehicles, roofs, and other outside structures. The storm also produced a brief tornado about 11 miles south of Fort Pierre, just west of US Highway 83, around 6:45 pm CDT. These storms then moved south and east through the evening, producing large hail and damaging winds. A wind gust of 100 mph was recorded just west of Oacoma at 8:15 pm CDT via a weather station from the South Dakota State University's mesonet. Damage was done to power poles, trees, trailers, and other property in and around Oacoma.

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:37:00 to 18-JUL-23 17:37:00 (CST-6)
Location: PIERRE
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:40:00 to 18-JUL-23 17:40:00 (CST-6)
Location: (PIR)PIERRE ARPT
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:45:00 to 18-JUL-23 17:45:00 (CST-6)
Location: PIERRE
Magnitude: 2.75 
Reported by: Public

Hail in STANLEY, SOUTH DAKOTA
From 18-JUL-23 16:45:00 to 18-JUL-23 16:45:00 (MST-7)
Location: FT PIERRE
Magnitude: 2.75 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:47:00 to 18-JUL-23 17:47:00 (CST-6)
Location: PIERRE
Magnitude: 4.50 
Reported by: Public

A photo of an estimated 4.5 inch hailstone was submitted on Facebook.

Hail in LYMAN, SOUTH DAKOTA
From 18-JUL-23 18:40:00 to 18-JUL-23 18:40:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:49:00 to 18-JUL-23 19:49:00 (CST-6)
Location: KENNEBEC
Magnitude: 1.50 
Reported by: Trained Spotter

Tornado in STANLEY, SOUTH DAKOTA
From 18-JUL-23 16:45:00 to 18-JUL-23 16:50:00 (MST-7)
Location: FT PIERRE
Tornado F-scale: EF0
Reported by: Public

A member of the public shared a video of a nearly stationary tornado in an open field.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 18:29:00 to 18-JUL-23 18:29:00 (CST-6)
Location: LOWER BRULE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 18:45:00 to 18-JUL-23 18:45:00 (CST-6)
Location: LOWER BRULE
Magnitude: 61.00 EG
Reported by: Trained Spotter

A trained spotter estimated 70 mph winds, which caused tree damage and downed powerlines. Solar panels were also damaged.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:05:00 to 18-JUL-23 19:05:00 (CST-6)
Location: OACOMA
Magnitude: 56.00 EG
Reported by: Public

A semi was tipped over on Instate 90.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:05:00 to 18-JUL-23 19:05:00 (CST-6)
Location: RELIANCE
Magnitude: 56.00 EG
Reported by: Public

Report of a semi tipped over along Interstate 90.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 18:48:00 to 18-JUL-23 18:48:00 (CST-6)
Location: LOWER BRULE
Magnitude: 56.00 MG
Reported by: Mesonet

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:40:00 to 18-JUL-23 17:40:00 (CST-6)
Location: PIERRE
Magnitude: 2.00 
Reported by: Public

Hail in HYDE, SOUTH DAKOTA
From 18-JUL-23 17:40:00 to 18-JUL-23 17:40:00 (CST-6)
Location: HOLABIRD
Magnitude: 1.00 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:43:00 to 18-JUL-23 17:43:00 (CST-6)
Location: PIERRE
Magnitude: 1.75 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 17:56:00 to 18-JUL-23 17:56:00 (CST-6)
Location: PIERRE
Magnitude: 2.50 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 18:00:00 to 18-JUL-23 18:00:00 (CST-6)
Location: PIERRE
Magnitude: 3.00 
Reported by: Public

A photo of an estimated 3 inch hailstone was submitted on Facebook.

Hail in HYDE, SOUTH DAKOTA
From 18-JUL-23 18:00:00 to 18-JUL-23 18:00:00 (CST-6)
Location: HIGHMORE ARPT
Magnitude: 1.75 
Reported by: Public

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:15:00 to 18-JUL-23 19:15:00 (CST-6)
Location: OACOMA
Magnitude: 87.00 MG
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:28:00 to 18-JUL-23 19:28:00 (CST-6)
Location: RELIANCE ARPT
Magnitude: 62.00 MG
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 18-JUL-23 19:16:00 to 18-JUL-23 19:16:00 (CST-6)
Location: OACOMA
Magnitude: 65.00 EG
Reported by: Trained Spotter

A trained spotter reported tree damage, downed powerlines, tipped over campers, and roof damage in and around Oacoma.

Hail in HUGHES, SOUTH DAKOTA
From 18-JUL-23 18:18:00 to 18-JUL-23 18:18:00 (CST-6)
Location: PIERRE
Magnitude: 3.00 
Reported by: Public