A line of severe thunderstorms developed over far southwestern South Dakota and tracked northeastward across much of southwestern into central South Dakota. The storms produced wind gusts of 60 to 80 mph and small hail. The winds caused minor damage, mostly to trees and power poles.

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 15:29:00 to 27-JUN-17 15:44:00 (MST-7)
Location: JEWEL CAVE NATL MON
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 15:57:00 to 27-JUN-17 15:57:00 (MST-7)
Location: CUSTER CO ARPT
Magnitude: 60.00 MG
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 16:00:00 to 27-JUN-17 16:00:00 (MST-7)
Location: CUSTER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Part of the YMCA building's roof was torn off, a large sign was blown down, and trees were toppled by strong winds in Custer.

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 16:17:00 to 27-JUN-17 16:17:00 (MST-7)
Location: FAIRBURN
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: RAWS

Thunderstorm Wind in FALL RIVER, SOUTH DAKOTA
From 27-JUN-17 15:55:00 to 27-JUN-17 15:55:00 (MST-7)
Location: HOT SPRINGS MUNICIPAL AIRPORT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in FALL RIVER, SOUTH DAKOTA
From 27-JUN-17 15:57:00 to 27-JUN-17 15:57:00 (MST-7)
Location: EDGEMONT
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 15:49:00 to 27-JUN-17 15:49:00 (MST-7)
Location: HILL CITY
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Park/Forest Service

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:20:00 to 27-JUN-17 16:20:00 (MST-7)
Location: JOHNSON SIDING
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Pine trees were snapped and part of a roof was damaged by the wind.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:25:00 to 27-JUN-17 16:25:00 (MST-7)
Location: RAPID CITY
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:30:00 to 27-JUN-17 16:30:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

A metal building was damaged by the wind.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:35:00 to 27-JUN-17 16:35:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tree branches were broken throughout Rapid City.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:37:00 to 27-JUN-17 16:37:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

Roof shingles were blown off a house.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:30:00 to 27-JUN-17 16:30:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

Minor tree damage was caused by the wind.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 27-JUN-17 16:43:00 to 27-JUN-17 16:53:00 (MST-7)
Location: (RCA)ELLSWORTH AFB
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:37:00 to 27-JUN-17 16:52:00 (MST-7)
Location: (RAP)RAPID CITY ARPT
Magnitude: 65.00 MG
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:42:00 to 27-JUN-17 16:42:00 (MST-7)
Location: RAPID CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts were estimated at 70 mph.

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 27-JUN-17 17:15:00 to 27-JUN-17 17:15:00 (MST-7)
Location: CACTUS FLATS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dime sized hail also fell with the storm.

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 27-JUN-17 17:30:00 to 27-JUN-17 17:30:00 (MST-7)
Location: COTTONWOOD
Magnitude: 58.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 27-JUN-17 17:15:00 to 27-JUN-17 17:20:00 (MST-7)
Location: CACTUS FLATS
Magnitude: 57.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 27-JUN-17 17:55:00 to 27-JUN-17 18:00:00 (MST-7)
Location: BELVIDERE
Magnitude: 66.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:50:00 to 27-JUN-17 16:55:00 (MST-7)
Location: NEW UNDERWOOD
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 17:10:00 to 27-JUN-17 17:40:00 (MST-7)
Location: WASTA
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 16:15:00 to 27-JUN-17 16:15:00 (MST-7)
Location: HERMOSA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated winds at 60 mph.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:05:00 to 27-JUN-17 16:05:00 (MST-7)
Location: HILL CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree blew down onto US Highway 16 south of Hill City.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 27-JUN-17 17:42:00 to 27-JUN-17 17:42:00 (MST-7)
Location: PHILIP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were reported as 60 mph.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 27-JUN-17 17:52:00 to 27-JUN-17 18:02:00 (MST-7)
Location: (PHP)PHILIP ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 16:08:00 to 27-JUN-17 16:18:00 (MST-7)
Location: FAIRBURN
Magnitude: 61.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 27-JUN-17 16:00:00 to 27-JUN-17 16:00:00 (MST-7)
Location: CUSTER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Park/Forest Service

Many pine trees were bent and several trees were snapped by the wind.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 27-JUN-17 16:05:00 to 27-JUN-17 16:05:00 (MST-7)
Location: HILL CITY
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Several small trees were downed by the wind at the Medicine Mountain Boy Scout Camp.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 27-JUN-17 18:08:00 to 27-JUN-17 18:08:00 (MST-7)
Location: KIRLEY
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Pea size hail also fell with the storm.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 27-JUN-17 18:28:00 to 27-JUN-17 18:28:00 (MST-7)
Location: KIRLEY
Magnitude: 55.00 MG
Crop damage: 0.00K
Reported by: Public