Thunderstorms produces numerous reports of large hail and damaging winds in and near Sioux Falls on the evening of August 31st.

Thunderstorm Wind in LINCOLN, SOUTH DAKOTA
From 31-AUG-13 21:15:00 to 31-AUG-13 21:15:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds caused tree damage, including 5 large evergreen trees blown down. The winds also blew down a fence.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:16:00 to 31-AUG-13 21:17:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: NWS Employee

Large hail caused an unknown amount of damage to vehicles and windows.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:00:00 to 31-AUG-13 21:00:00 (CST-6)
Location: HARTFORD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:15:00 to 31-AUG-13 21:15:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 1.75 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large hail, driven by estimated 55 mph winds, damaged vehicles, broke windows, and damaged siding.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:08:00 to 31-AUG-13 21:17:00 (CST-6)
Location: SOUTH SIOUX FALLS
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm winds damaged several businesses, including a large retail store which was also struck by lightning. The large store lost part of its roof, while the stockroom of the same store and its contents were also damaged. A canopy type tent was destroyed, and a 20 foot retaining wall was blown down. The winds caused extensive tree damage, including several trees blown down, one of which blocked a major intersection when it fell.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:15:00 to 31-AUG-13 21:15:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Public

Large hail caused an unknown amount of damage to vehicles.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:08:00 to 31-AUG-13 21:17:00 (CST-6)
Location: SOUTH SIOUX FALLS
Magnitude: 2.00 
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail damaged numerous vehicles and broke windows. A woman suffered minor injuries from the hail after taking refuge in a vehicle.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 20:47:00 to 31-AUG-13 20:47:00 (CST-6)
Location: HARTFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:10:00 to 31-AUG-13 21:10:00 (CST-6)
Location: SOUTH SIOUX FALLS
Magnitude: 1.50 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: COOP Observer

Large hail was accompanied by estimated 55 mph winds. The hail damaged vehicles in the area.

Hail in MINNEHAHA, SOUTH DAKOTA
From 31-AUG-13 21:03:00 to 31-AUG-13 21:16:00 (CST-6)
Location: WEST SIOUX FALLS
Magnitude: 2.50 
Property damage: 4.00M
Crop damage: 0.00K
Reported by: Emergency Manager

Large hail broke windows and damaged many vehicles, as well as siding and roofs. One automobile dealer with a large temporary outdoor display reported four thousand vehicles  were damaged.