The second windstorm in a few days occurred from the evening of June 21st to the morning of June 22nd. Some of the same areas hit by the June 19th and 20th event were impacted once again. The first bout came from a bowing line of storms in south central North Dakota that moved southeast and affected parts of northeast South Dakota with damaging winds over 60 mph along with large hail up to baseball size.
The main event occurred later on as severe storms in western South Dakota moved east at around 60 mph and morphed into a severe windstorm.  By early in the morning, the line entered into western Stanley county and produced a wind gust up to 122 mph near Hayes. One person was injured here as a camper rolled. An office building was also moved and grain bins were destroyed. The windstorm continued to move quickly east and reached Pierre and Fort Pierre at around 3 am CDT. Major widespread damage occurred in both cities with winds gusting to over 80 mph.  Countless trees were downed, a mobile home and semi trucks were flipped, a grain silo was destroyed, along with several buildings damaged. Also, power poles were snapped and lines were downed across parts of the area leaving many people without power for several days. Winds as high as 70 mph continued for some time after the storm's passage in Pierre.  The storms then went on to the east and southeast producing more wind damage to structures and trees.

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:19:00 to 21-JUN-15 23:19:00 (CST-6)
Location: ABERDEEN
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 22-JUN-15 00:45:00 to 22-JUN-15 00:45:00 (CST-6)
Location: MOBRIDGE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 22-JUN-15 01:00:00 to 22-JUN-15 01:00:00 (CST-6)
Location: SELBY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in POTTER, SOUTH DAKOTA
From 22-JUN-15 01:20:00 to 22-JUN-15 01:20:00 (CST-6)
Location: HOVEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 22-JUN-15 00:32:00 to 22-JUN-15 00:32:00 (MST-7)
Location: HAYES
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Seventy mph winds were estimated in Hayes.

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 22-JUN-15 01:21:00 to 22-JUN-15 01:21:00 (CST-6)
Location: LOWRY
Magnitude: 63.00 MG
Reported by: CoCoRaHS

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 22-JUN-15 00:31:00 to 22-JUN-15 00:31:00 (MST-7)
Location: HAYES
Magnitude: 79.00 MG
Reported by: Public

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 22-JUN-15 00:30:00 to 22-JUN-15 00:30:00 (MST-7)
Location: HAYES AIRSTRIP
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: COOP Observer

Eighty mph winds caused siding and shingle damage.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 22-JUN-15 02:09:00 to 22-JUN-15 02:09:00 (CST-6)
Location: KENNEBEC
Magnitude: 61.00 EG
Reported by: Trained Spotter

Seventy mph winds were estimated.

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 21-JUN-15 23:08:00 to 21-JUN-15 23:08:00 (MST-7)
Location: BULLHEAD
Magnitude: 70.00 MG
Reported by: Mesonet

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 21-JUN-15 23:35:00 to 21-JUN-15 23:35:00 (MST-7)
Location: WHITEHORSE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 22-JUN-15 02:04:00 to 22-JUN-15 02:04:00 (CST-6)
Location: MC CLURE
Magnitude: 56.00 EG
Reported by: Public

Sixty-five mph winds were estimated.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 22-JUN-15 02:09:00 to 22-JUN-15 02:09:00 (CST-6)
Location: PIERRE
Magnitude: 70.00 MG
Reported by: ASOS

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 22-JUN-15 01:50:00 to 22-JUN-15 01:50:00 (CST-6)
Location: MC CLURE
Magnitude: 57.00 MG
Reported by: Mesonet

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 22-JUN-15 02:45:00 to 22-JUN-15 02:45:00 (CST-6)
Location: DANFORTH
Magnitude: 58.00 MG
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 22-JUN-15 01:20:00 to 22-JUN-15 01:20:00 (CST-6)
Location: PRESHO
Magnitude: 61.00 EG
Reported by: Public

Seventy mph winds were estimated.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 22-JUN-15 01:30:00 to 22-JUN-15 01:30:00 (CST-6)
Location: WEBSTER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Several storage buildings in the lumber yard were rolled with some house windows broken along with several business signs destroyed.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 22-JUN-15 02:09:00 to 22-JUN-15 02:09:00 (CST-6)
Location: PIERRE
Magnitude: 70.00 EG
Reported by: Emergency Manager

Eighty mph winds or higher downed many trees throughout Pierre along with damaging many buildings and vehicles.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 22-JUN-15 01:00:00 to 22-JUN-15 01:00:00 (MST-7)
Location: FT PIERRE
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Newspaper

Eighty mph winds blew over a semi, damaged a grain elevator, flipped a newly manufactured home, along with downing many trees in Fort Pierre.   Also, many grains bins near Fort Pierre sustained severe damage.

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 22-JUN-15 02:05:00 to 22-JUN-15 02:05:00 (CST-6)
Location: CANNING
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 22-JUN-15 00:31:00 to 22-JUN-15 00:31:00 (MST-7)
Location: HAYES
Magnitude: 106.00 MG
Reported by: Mesonet

Measured winds of over one-hundred twenty mph by a home wind system rolled a camper office building and destroyed several grain bins. One person was injured when the office building rolled.

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 21-JUN-15 22:56:00 to 21-JUN-15 22:56:00 (CST-6)
Location: WESTPORT
Magnitude: 52.00 EG
Reported by: COOP Observer

Sixty mph winds caused damage to a smoke shack and moved a boat several feet.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 22-JUN-15 04:12:00 to 22-JUN-15 04:12:00 (CST-6)
Location: HAYTI
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Seventy mph winds uprooted a tree and downed many large tree limbs.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 22-JUN-15 02:59:00 to 22-JUN-15 02:59:00 (CST-6)
Location: REDFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Hail in GRANT, SOUTH DAKOTA
From 22-JUN-15 01:55:00 to 22-JUN-15 01:55:00 (CST-6)
Location: TWIN BROOKS
Magnitude: 1.75 
Reported by: Public

Hail in SPINK, SOUTH DAKOTA
From 22-JUN-15 02:58:00 to 22-JUN-15 02:58:00 (CST-6)
Location: FRANKFORT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 21-JUN-15 22:54:00 to 21-JUN-15 22:54:00 (CST-6)
Location: BARNARD
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 21-JUN-15 22:45:00 to 21-JUN-15 22:45:00 (CST-6)
Location: WINSHIP
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MCPHERSON, SOUTH DAKOTA
From 21-JUN-15 22:15:00 to 21-JUN-15 22:15:00 (CST-6)
Location: LANGLAKE
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Half dollar size hail caused damaged to siding and vehicles.

Hail in MCPHERSON, SOUTH DAKOTA
From 21-JUN-15 22:15:00 to 21-JUN-15 22:15:00 (CST-6)
Location: LANGLAKE
Magnitude: 2.00 
Reported by: Public

Large hail up to 2 inches in diameter damaged siding and crops.

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:10:00 to 21-JUN-15 23:10:00 (CST-6)
Location: RICHMOND
Magnitude: 1.75 
Reported by: Public

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:11:00 to 21-JUN-15 23:11:00 (CST-6)
Location: ABERDEEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:15:00 to 21-JUN-15 23:15:00 (CST-6)
Location: GAGE
Magnitude: 1.50 
Reported by: CoCoRaHS

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:18:00 to 21-JUN-15 23:18:00 (CST-6)
Location: BATH
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in BROWN, SOUTH DAKOTA
From 22-JUN-15 00:10:00 to 22-JUN-15 00:10:00 (CST-6)
Location: FERNEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DAY, SOUTH DAKOTA
From 22-JUN-15 00:50:00 to 22-JUN-15 00:50:00 (CST-6)
Location: WEBSTER MUNI ARPT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DAY, SOUTH DAKOTA
From 22-JUN-15 00:51:00 to 22-JUN-15 00:51:00 (CST-6)
Location: WEBSTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JONES, SOUTH DAKOTA
From 22-JUN-15 00:57:00 to 22-JUN-15 00:57:00 (CST-6)
Location: DRAPER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCPHERSON, SOUTH DAKOTA
From 21-JUN-15 22:34:00 to 21-JUN-15 22:34:00 (CST-6)
Location: LEOLA
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: COOP Observer

Severe winds combined with quarter size hail broke twelve windows out of the county courthouse.

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:00:00 to 21-JUN-15 23:00:00 (CST-6)
Location: RICHMOND
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:00:00 to 21-JUN-15 23:00:00 (CST-6)
Location: RICHMOND
Magnitude: 1.00 
Reported by: CoCoRaHS

Hail in BROWN, SOUTH DAKOTA
From 21-JUN-15 23:05:00 to 21-JUN-15 23:05:00 (CST-6)
Location: RICHMOND
Magnitude: 2.75 
Reported by: Public