As an upper-level jet streak moved into southeast South Dakota during the late evening of August 4, a cluster of storms developed in south central South Dakota along and in advance of a surface trough axis where elevated instability was over 2000 J/kg.  These storms moved in a general easterly direction, producing occasional large hail, damaging winds and even a rare nighttime tornado.

Hail in JERAULD, SOUTH DAKOTA
From 04-AUG-18 23:24:00 to 04-AUG-18 23:25:00 (CST-6)
Location: WESSINGTON SPGS
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in JERAULD, SOUTH DAKOTA
From 04-AUG-18 23:30:00 to 04-AUG-18 23:32:00 (CST-6)
Location: WESSINGTON SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Vehicles and crops were damaged by the large hail.

Hail in AURORA, SOUTH DAKOTA
From 04-AUG-18 23:34:00 to 04-AUG-18 23:35:00 (CST-6)
Location: WHITE LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCCOOK, SOUTH DAKOTA
From 04-AUG-18 23:52:00 to 04-AUG-18 23:54:00 (CST-6)
Location: STANLEY CORNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail size varied between one-half inch and one inch diameter.

Hail in AURORA, SOUTH DAKOTA
From 05-AUG-18 00:02:00 to 05-AUG-18 00:03:00 (CST-6)
Location: PLANKINTON
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Picture of hail received through social media.

Hail in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:54:00 to 05-AUG-18 00:56:00 (CST-6)
Location: (FSD)JOE FOSS FLD SI
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:55:00 to 05-AUG-18 00:57:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail accompanied by measured wind gusts to 68 mph.

Hail in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:56:00 to 05-AUG-18 00:58:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 01:01:00 to 05-AUG-18 01:03:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail varied in size from dime to quarter size.

Tornado in AURORA, SOUTH DAKOTA
From 04-AUG-18 23:40:00 to 04-AUG-18 23:45:00 (CST-6)
Location: WHITE LAKE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tornado caused a swath of damage to crops, and moved round hay bales.  Fences and trees were also damaged along the path.

Thunderstorm Wind in MCCOOK, SOUTH DAKOTA
From 05-AUG-18 00:41:00 to 05-AUG-18 00:43:00 (CST-6)
Location: MONTROSE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Social media report of a large tree limb broken.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:46:00 to 05-AUG-18 00:48:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Light pole knocked over by strong winds in downtown Sioux Falls.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:47:00 to 05-AUG-18 00:49:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Trees down and power out around Cherry Rock Park.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:51:00 to 05-AUG-18 00:52:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Large spruce tree uprooted by strong winds.

Thunderstorm Wind in LINCOLN, SOUTH DAKOTA
From 05-AUG-18 01:20:00 to 05-AUG-18 01:22:00 (CST-6)
Location: LENNOX SKIE ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Pine tree was uprooted and fell on a house.

Thunderstorm Wind in LINCOLN, SOUTH DAKOTA
From 05-AUG-18 01:20:00 to 05-AUG-18 01:22:00 (CST-6)
Location: HARRISBURG
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A large tree was blown over by strong winds.

Thunderstorm Wind in LINCOLN, SOUTH DAKOTA
From 05-AUG-18 01:30:00 to 05-AUG-18 01:32:00 (CST-6)
Location: LENNOX SKIE ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Damage to shingles on house, as well as numerous trees downed on farm property.

Thunderstorm Wind in CLAY, SOUTH DAKOTA
From 05-AUG-18 01:50:00 to 05-AUG-18 01:52:00 (CST-6)
Location: VERMILLION
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm outflow winds blew over a large tree in Vermillion.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:55:00 to 05-AUG-18 00:57:00 (CST-6)
Location: SIOUX FALLS
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Wind measured by anemometer, accompanied by hail to golf ball size.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 05-AUG-18 00:59:00 to 05-AUG-18 01:00:00 (CST-6)
Location: EAST SIOUX FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Fence and tree damage.

Thunderstorm Wind in DAVISON, SOUTH DAKOTA
From 05-AUG-18 00:04:00 to 05-AUG-18 00:04:00 (CST-6)
Location: (MHE)MITCHELL ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS