An isolated supercell developed behind a southward sagging frontal boundary.  With around 1000 J/kg MLCAPE and 40-45 knots of effective shear, a brief supercellular structure evolved. Even with hail size somewhat limited by available instability, substantial damage to total destruction of crops occurred due to the large quantity of wind-driven hail.

Hail in PLYMOUTH, IOWA
From 22-JUN-21 17:10:00 to 22-JUN-21 17:46:00 (CST-6)
Location: O LEARY
Magnitude: 1.00 
Property damage: 6.00K
Crop damage: 5.22M
Reported by: Emergency Manager

Wind-driven hail produced considerable to total crop damage. Damage began around 4 miles southeast of Le Mars, and followed a nearly continuous 1 to 3 mile wide path for 17 miles to the southeast, crossing into Cherokee and Woodbury County around 6 miles east southeast of Kingsley.  Hail varied from dime to quarter size along the path, with quarter size hail 3 miles north northeast of Kingsley at 1734 CST and 5 miles east northeast of Kingsley at 1738 CST.  Winds were estimated as high as 60 to 65 mph. Damage was done to the siding of a house 1.5 miles east of O Leary at 1720 CST.  The worst crop damage occurred from 3 miles north to 4 miles east of Kingsley, where hail was still 3 inches deep on roadways an hour after the storm.  The path was determined from surface reports and Sentinel satellite data. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture. Property damage costs are a rough estimate.

Hail in WOODBURY, IOWA
From 22-JUN-21 17:46:00 to 22-JUN-21 17:55:00 (CST-6)
Location: PIERSON
Magnitude: 1.75 
Crop damage: 8.00K
Reported by: Emergency Manager

The wind-driven hail damage path continued out of Plymouth and Cherokee Counties into Woodbury County, where the continuous path ended around 2 miles east southeast of Pierson. The largest hail reported along the path was observed near Pierson with golf ball size hail at 1748 CST.  Half dollar size hail was reported at 1755 CST 3.5 miles north northwest of Correctionville. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in PLYMOUTH, IOWA
From 22-JUN-21 17:23:00 to 22-JUN-21 17:26:00 (CST-6)
Location: O LEARY
Magnitude: 56.00 EG
Property damage: 2.00K
Reported by: Broadcast Media

Thunderstorm winds snapped off a one-foot diameter tree a few feet above the ground. Property damage costs are a rough estimate.

Funnel Cloud in PLYMOUTH, IOWA
From 22-JUN-21 17:34:00 to 22-JUN-21 17:35:00 (CST-6)
Location: O LEARY
Reported by: Public

A brief funnel cloud was observed as the storm approached the viewer's location.

Thunderstorm Wind in PLYMOUTH, IOWA
From 22-JUN-21 17:20:00 to 22-JUN-21 17:22:00 (CST-6)
Location: O LEARY
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: Public

A large playset was displaced by thunderstorm winds. Property damage costs are a rough estimate.

Hail in CHEROKEE, IOWA
From 22-JUN-21 17:42:00 to 22-JUN-21 17:50:00 (CST-6)
Location: WASHTA
Magnitude: 1.25 
Crop damage: 191.00K
Reported by: Emergency Manager

A continuation of the wind-driven hail path from Plymouth County, extensive to total crop damage was noted across the southwest corner of Cherokee County. The path was determined from Sentinel satellite data and ground survey. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.