A cluster of thunderstorms developed across eastern Montana and the western Dakotas during the morning hours. These storms organized and turned southeastward, feeding on rich inflow of post-frontal air with up to 3000 J/kg of MLCAPE and over 1000 J/kg of DCAPE. Along with strong storm-relative shear, parameters favored development of a strong cold pool and balanced mesocyclone, which spread southeast with the cluster and developed a strong and long-duration severe wind event which traversed South Dakota, southwest Minnesota, extreme northeast Nebraska, and northwest Iowa during the afternoon and early evening. The storm was classified as a derecho, and featured numerous wind gusts from 70 to 100 mph and considerable damage to trees, crops, powerlines, and structures along its path.

Thunderstorm Wind in LYON, IOWA
From 05-JUL-22 16:30:00 to 05-JUL-22 16:45:00 (CST-6)
Location: EDNA
Magnitude: 56.00 MG
Crop damage: 16.00K
Reported by: Public

A peak thunderstorm wind gust of 64 mph was measured by personal weather station KIAROCKR18 6 miles east of Rock Rapids. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in WOODBURY, IOWA
From 05-JUL-22 15:49:00 to 05-JUL-22 15:52:00 (CST-6)
Location: (SUX)SIOUX CITY ARPT
Magnitude: 51.00 MG
Crop damage: 80.00K
Reported by: ASOS

A thunderstorm wind gust of 59 mph was measured by Automated Surface Observing System site KSUX 2 miles west of Sergeant Bluff. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in O'BRIEN, IOWA
From 05-JUL-22 15:59:00 to 05-JUL-22 16:03:00 (CST-6)
Location: HARTLEY
Magnitude: 69.00 MG
Crop damage: 230.00K
Reported by: Public

A thunderstorm wind gust of 79 mph was measured by personal weather station KIAHARTL8 5 miles west of Hartley. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in O'BRIEN, IOWA
From 05-JUL-22 15:51:00 to 05-JUL-22 16:00:00 (CST-6)
Location: SANBORN
Magnitude: 78.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds snapped numerous power poles, and downed a 3 foot diameter tree as well as many 2 to 4 inch diameter branches. Power was knocked out for several hours when falling tree limbs took down powerlines.

Thunderstorm Wind in CLAY, IOWA
From 05-JUL-22 17:30:00 to 05-JUL-22 17:45:00 (CST-6)
Location: ROYAL
Magnitude: 70.00 EG
Reported by: Emergency Manager

Several trees were downed just west of Royal by thunderstorm wind gusts.

Thunderstorm Wind in O'BRIEN, IOWA
From 05-JUL-22 16:05:00 to 05-JUL-22 16:15:00 (CST-6)
Location: SUTHERLAND
Magnitude: 78.00 EG
Reported by: Emergency Manager

Thunderstorms winds snapped a 150 foot tree in Sutherland - at the time the largest tree in O'Brien County.  Limbs which fell on powerlines resulted in up to 5 hours without power.

Thunderstorm Wind in O'BRIEN, IOWA
From 05-JUL-22 15:44:00 to 05-JUL-22 15:54:00 (CST-6)
Location: SHELDON
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Social Media

Multiple tree limbs were downed by thunderstorm winds in Sheldon.

Thunderstorm Wind in LYON, IOWA
From 05-JUL-22 16:32:00 to 05-JUL-22 16:42:00 (CST-6)
Location: GEORGE
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Social Media

Multiple trees and power lines downed by thunderstorm winds in George.