A surface low pressure area and attached cold front triggered storms across north central South Dakota which became quickly severe. The severe storms became destructive as they moved southeast from the late afternoon through the evening hours. Extensive crop and property damage resulted from winds up to eighty mph along with large hail to baseball size or larger across portions of Corson, Dewey, Walworth, Potter, Sully, Hughes, and Lyman counties. Two rounds of severe storms about an hour apart affected areas roughly from Blunt to Lower Brule to Iona. Siding, windows, and vehicles were damaged along the path of the storms. Some big round hay bales were also rolled for quite a distance by the severe winds.
The most destructive path of grassland and crop damage occurred from Little Eagle in Corson county southeast to near Onida in Sully county.  Several thousand acres of crops and grassland were destroyed along an estimated 70 mile path which varied from 2 to 6 miles wide. Satellite imagery showed the path of destruction.

Hail in SULLY, SOUTH DAKOTA
From 06-AUG-19 17:50:00 to 06-AUG-19 17:50:00 (CST-6)
Location: ONIDA
Magnitude: 1.75 
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:18:00 to 06-AUG-19 18:18:00 (CST-6)
Location: SELBY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 06-AUG-19 20:15:00 to 06-AUG-19 20:15:00 (CST-6)
Location: LOWER BRULE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Sixty mph winds were estimated.

Hail in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:23:00 to 06-AUG-19 17:23:00 (CST-6)
Location: GORMAN
Magnitude: 1.75 
Reported by: Public

Hail in CAMPBELL, SOUTH DAKOTA
From 06-AUG-19 17:35:00 to 06-AUG-19 17:35:00 (CST-6)
Location: HERREID
Magnitude: 1.00 
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 14:00:00 to 06-AUG-19 14:00:00 (MST-7)
Location: WATAUGA
Magnitude: 1.00 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:21:00 to 06-AUG-19 18:21:00 (CST-6)
Location: BLUNT
Magnitude: 2.75 
Reported by: Trained Spotter

Golf ball to baseball size hail fell in an around Blunt with many windows broken along with siding damaged.

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:28:00 to 06-AUG-19 18:28:00 (CST-6)
Location: JAVA
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:30:00 to 06-AUG-19 18:30:00 (CST-6)
Location: JAVA
Magnitude: 2.75 
Reported by: Trained Spotter

Golf ball to baseball size hail broke home and vehicle windows.

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:40:00 to 06-AUG-19 18:40:00 (CST-6)
Location: JAVA
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:47:00 to 06-AUG-19 18:47:00 (CST-6)
Location: LOWRY
Magnitude: 1.00 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:48:00 to 06-AUG-19 18:48:00 (CST-6)
Location: DE GREY
Magnitude: 3.00 
Reported by: Storm Chaser

A storm chaser reported hail stones of 3 inches or larger.

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:50:00 to 06-AUG-19 18:50:00 (CST-6)
Location: LOWRY
Magnitude: 1.25 
Reported by: Public

Half dollar size hail caused some garden and crop damage.

Hail in EDMUNDS, SOUTH DAKOTA
From 06-AUG-19 19:04:00 to 06-AUG-19 19:04:00 (CST-6)
Location: BOWDLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in LYMAN, SOUTH DAKOTA
From 06-AUG-19 19:05:00 to 06-AUG-19 19:05:00 (CST-6)
Location: LOWER BRULE
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in FAULK, SOUTH DAKOTA
From 06-AUG-19 19:10:00 to 06-AUG-19 19:10:00 (CST-6)
Location: ONAKA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 19:20:00 to 06-AUG-19 19:20:00 (CST-6)
Location: BLUNT
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 19:28:00 to 06-AUG-19 19:28:00 (CST-6)
Location: BLUNT
Magnitude: 1.25 
Reported by: Public

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 20:05:00 to 06-AUG-19 20:05:00 (CST-6)
Location: DE GREY
Magnitude: 1.00 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 06-AUG-19 20:15:00 to 06-AUG-19 20:15:00 (CST-6)
Location: LOWER BRULE
Magnitude: 2.75 
Reported by: Fire Department/Rescue

Tennis to baseball size hail damaged homes and vehicle windows.

Hail in LYMAN, SOUTH DAKOTA
From 06-AUG-19 21:04:00 to 06-AUG-19 21:04:00 (CST-6)
Location: IONA
Magnitude: 2.00 
Reported by: Public

Golf ball size hail or larger damaged siding, broke windows, and severely damaged crops.

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 14:25:00 to 06-AUG-19 15:26:00 (MST-7)
Location: LITTLE EAGLE
Magnitude: 1.75 
Reported by: Public

Large hail and severe winds began a destructive path of crop and grassland damage from near Little Eagle and to the southeast before moving into eastern Dewey county.

Hail in DEWEY, SOUTH DAKOTA
From 06-AUG-19 15:26:00 to 06-AUG-19 16:12:00 (MST-7)
Location: TRAIL CITY
Magnitude: 1.75 
Reported by: Public

A severe thunderstorm with large hail and destructive winds left southeast Corson and continued southeast across eastern Dewey county destroying crop and grassland in its path. The storm then entered western Potter county.

Hail in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:12:00 to 06-AUG-19 17:43:00 (CST-6)
Location: GORMAN
Magnitude: 1.75 
Reported by: Public

A severe thunderstorm with large hail and destructive winds left southeast Dewey crossing the Missouri River into western Potter county continuing to destroy crop and grassland in its path. The storm continued to move southeast entering northern Sully county.

Hail in SULLY, SOUTH DAKOTA
From 06-AUG-19 17:43:00 to 06-AUG-19 17:58:00 (CST-6)
Location: AGAR
Magnitude: 1.75 
Reported by: Public

A destructive hail and wind storm left Potter county and entered northern Sully county continuing to the southeast and destroying crops and grassland until the storm weakened near Onida.

Hail in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:16:00 to 06-AUG-19 18:53:00 (CST-6)
Location: JAVA JCT
Magnitude: 2.75 
Reported by: Trained Spotter

Golf ball to baseball size hail along with severe winds brought a destructive path of crops from northwest of Java to Java during the evening hours. The path width was anywhere from 2 to 5 miles. The destruction was shown on satellite.

Thunderstorm Wind in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:25:00 to 06-AUG-19 17:25:00 (CST-6)
Location: GORMAN
Magnitude: 70.00 EG
Reported by: Public

Eighty mph winds along with tennis ball size hail shredded siding, broke many windows, along with downing many trees. Hail piled up to 7 to 8 inches deep in places.

Thunderstorm Wind in CAMPBELL, SOUTH DAKOTA
From 06-AUG-19 17:43:00 to 06-AUG-19 17:43:00 (CST-6)
Location: ARTAS
Magnitude: 52.00 EG
Reported by: Public

Sixty mph winds along with hail damaged crops and the garden.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 06-AUG-19 20:57:00 to 06-AUG-19 20:57:00 (CST-6)
Location: IONA
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Public

Eighty mph winds downed trees and took shingles off the roof.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:21:00 to 06-AUG-19 18:21:00 (CST-6)
Location: BLUNT
Magnitude: 56.00 EG
Reported by: Trained Spotter

Estimated sixty-five mph winds occurred with baseball size hail with windows and siding damaged.

Thunderstorm Wind in SULLY, SOUTH DAKOTA
From 06-AUG-19 17:43:00 to 06-AUG-19 17:43:00 (CST-6)
Location: LAUREL
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated seventy mph winds downed a large tree onto some power lines.

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 14:25:00 to 06-AUG-19 14:25:00 (MST-7)
Location: LITTLE EAGLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Funnel Cloud in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:15:00 to 06-AUG-19 18:15:00 (CST-6)
Location: BLUNT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 06-AUG-19 14:00:00 to 06-AUG-19 14:00:00 (MST-7)
Location: WATAUGA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 06-AUG-19 15:04:00 to 06-AUG-19 15:04:00 (MST-7)
Location: TRAIL CITY
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:18:00 to 06-AUG-19 18:18:00 (CST-6)
Location: SELBY
Magnitude: 52.00 EG
Reported by: Trained Spotter

Sixty mph winds were estimated with quarter size hail.

Hail in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:20:00 to 06-AUG-19 18:20:00 (CST-6)
Location: BLUNT
Magnitude: 2.50 
Reported by: Trained Spotter

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 14:45:00 to 06-AUG-19 14:45:00 (MST-7)
Location: LITTLE EAGLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 15:00:00 to 06-AUG-19 15:00:00 (MST-7)
Location: TRAIL CITY
Magnitude: 1.00 
Reported by: Public

Quarter size hail piled up to near 5 inches in spots with the corn stripped.

Thunderstorm Wind in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:23:00 to 06-AUG-19 17:23:00 (CST-6)
Location: GORMAN
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CAMPBELL, SOUTH DAKOTA
From 06-AUG-19 17:35:00 to 06-AUG-19 17:35:00 (CST-6)
Location: HERREID
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Sixty mph winds downed some large tree branches.

Hail in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:25:00 to 06-AUG-19 17:25:00 (CST-6)
Location: GORMAN
Magnitude: 2.50 
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 06-AUG-19 15:24:00 to 06-AUG-19 15:24:00 (MST-7)
Location: TRAIL CITY
Magnitude: 1.00 
Property damage: 0.00K
Reported by: Public

Quarter size hail stripped a lot of corn.

Hail in POTTER, SOUTH DAKOTA
From 06-AUG-19 17:23:00 to 06-AUG-19 17:23:00 (CST-6)
Location: GORMAN
Magnitude: 1.75 
Reported by: Public

Thunderstorm Wind in CAMPBELL, SOUTH DAKOTA
From 06-AUG-19 17:53:00 to 06-AUG-19 17:53:00 (CST-6)
Location: MOUND CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 06-AUG-19 18:20:00 to 06-AUG-19 18:20:00 (CST-6)
Location: BLUNT
Magnitude: 68.00 MG
Property damage: 0.00K
Reported by: Storm Chaser

Seventy-eight mph winds were measured along with tennis ball size hail.

Hail in SULLY, SOUTH DAKOTA
From 06-AUG-19 17:39:00 to 06-AUG-19 17:39:00 (CST-6)
Location: AGAR
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball hail broke all windows on the north side of the house.

Hail in SULLY, SOUTH DAKOTA
From 06-AUG-19 17:43:00 to 06-AUG-19 17:43:00 (CST-6)
Location: LAUREL
Magnitude: 1.75 
Reported by: Trained Spotter

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 06-AUG-19 18:33:00 to 06-AUG-19 18:33:00 (CST-6)
Location: JAVA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Sixty mph winds were estimated.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 06-AUG-19 19:45:00 to 06-AUG-19 19:45:00 (CST-6)
Location: RELIANCE ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet