A cold front moving in from the west brought severe weather to parts of central and north central South Dakota. Large hail up to golf ball size, damaging winds to 70 mph, along with flash flooding occurred during the morning hours. The big story was a long track destructive hailstorm and severe winds that started in southeast Dewey county and moved southeast through western Sully county and through Hughes County. The hail swath was nearly continuous and was from 2 to 5 miles wide and for nearly sixty miles. Tens of thousand of acres of crops and pastureland were destroyed by this storm along with some wildlife killed including pheasants and deer. The hail and wind also wreaked havoc on buildings, windows, and vehicles. A second destructive hail and wind storm would cross this area on June 29th.

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 05:20:00 to 27-JUN-18 05:20:00 (CST-6)
Location: KENNEBEC
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 05:38:00 to 27-JUN-18 05:38:00 (CST-6)
Location: MC CLURE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in STANLEY, SOUTH DAKOTA
From 27-JUN-18 05:09:00 to 27-JUN-18 08:09:00 (MST-7)
Location: FT PIERRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rains resulted in several flooded county roads for several hours.

Hail in SULLY, SOUTH DAKOTA
From 27-JUN-18 02:15:00 to 27-JUN-18 02:15:00 (CST-6)
Location: GALLAGHER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 05:48:00 to 27-JUN-18 05:48:00 (CST-6)
Location: OACOMA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 06:36:00 to 27-JUN-18 06:36:00 (CST-6)
Location: KENNEBEC
Magnitude: 1.50 
Reported by: Public

Hail in SULLY, SOUTH DAKOTA
From 27-JUN-18 02:25:00 to 27-JUN-18 03:30:00 (CST-6)
Location: GALLAGHER
Magnitude: 1.75 
Reported by: Newspaper

Large hail and damaging winds destroyed thousands of acres of crops and pastureland as a severe thunderstorm moved out of southeast Dewey county, across Sully county and through Hughes county. Some property damage also resulted from the severe winds and hail.

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 06:10:00 to 27-JUN-18 06:10:00 (CST-6)
Location: PRESHO MUNI ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 27-JUN-18 07:23:00 to 27-JUN-18 07:23:00 (CST-6)
Location: OACOMA
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in HUGHES, SOUTH DAKOTA
From 27-JUN-18 03:30:00 to 27-JUN-18 04:40:00 (CST-6)
Location: (PIR)PIERRE ARPT
Magnitude: 1.75 
Reported by: Newspaper

A severe thunderstorm with large hail and damaging winds came out of Sully county and tracked southeast across Hughes county destroying thousands of acres of crop and pastureland along its path. Some property damage also resulted from the severe winds and large hail.

Flash Flood in LYMAN, SOUTH DAKOTA
From 27-JUN-18 09:45:00 to 27-JUN-18 12:45:00 (CST-6)
Location: OACOMA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding from heavy rains occurred east of Oacoma with parts of roads underwater.

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 26-JUN-18 23:15:00 to 26-JUN-18 23:15:00 (MST-7)
Location: ATHBOY
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 27-JUN-18 00:15:00 to 27-JUN-18 00:15:00 (MST-7)
Location: PARADE
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 27-JUN-18 03:14:00 to 27-JUN-18 03:14:00 (CST-6)
Location: HARROLD ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BUFFALO, SOUTH DAKOTA
From 27-JUN-18 04:19:00 to 27-JUN-18 04:19:00 (CST-6)
Location: SHELBY
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 27-JUN-18 04:00:00 to 27-JUN-18 04:00:00 (CST-6)
Location: LOWER BRULE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Flash Flood in HUGHES, SOUTH DAKOTA
From 27-JUN-18 04:40:00 to 27-JUN-18 09:40:00 (CST-6)
Location: DE GREY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rains caused flash flooding over mainly west bend road for several hours.

Hail in STANLEY, SOUTH DAKOTA
From 27-JUN-18 02:20:00 to 27-JUN-18 02:20:00 (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 27-JUN-18 04:05:00 to 27-JUN-18 04:05:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STANLEY, SOUTH DAKOTA
From 27-JUN-18 04:32:00 to 27-JUN-18 04:32:00 (MST-7)
Location: FT PIERRE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 27-JUN-18 03:40:00 to 27-JUN-18 03:40:00 (CST-6)
Location: LOWER BRULE
Magnitude: 61.00 EG
Reported by: Public

Estimated seventy mph winds overturned several center pivots and flattened corn and beans.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 27-JUN-18 06:55:00 to 27-JUN-18 06:55:00 (CST-6)
Location: RELIANCE
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Several billboards were blown over by estimated sixty-five mph winds.

Hail in DEWEY, SOUTH DAKOTA
From 27-JUN-18 01:10:00 to 27-JUN-18 01:25:00 (MST-7)
Location: THATCHER
Magnitude: 1.50 
Reported by: Newspaper

Large hail and damaging winds destroyed many acres of crops and pastureland as a severe thunderstorm moved southeast out of Dewey into northwest Sully county.