Severe thunderstorms developed ahead of an approaching cold front during the afternoon and evening of Wednesday, July 14.  Some of the storms produced damaging winds and numerous tornadoes.  Brief torrential rainfall was also observed with the stronger storm cells.  The areas that were hit hardest were in Buchanan, Delaware, Benton, Linn, and Jones counties in IA, where a total of 14 tornadoes occurred.  7 of the tornadoes had no visible damage.

Tornado in BUCHANAN, IOWA
From 14-JUL-21 18:10:00 to 14-JUL-21 18:10:00 (CST-6)
Location: AURORA
Tornado F-scale: EFU
Reported by: Emergency Manager

Brief touchdown in a field with no visible damage.

Tornado in JONES, IOWA
From 14-JUL-21 21:02:00 to 14-JUL-21 21:20:00 (CST-6)
Location: MONTICELLO MUNI ARPT
Tornado F-scale: EF1
Reported by: NWS Storm Survey

An EF-1 tornado developed southeast of Monticello and tracked across rural areas east of Monticello along an intermittent 8 mile path through farmland and wooded areas.

Thunderstorm Wind in CEDAR, IOWA
From 14-JUL-21 21:56:00 to 14-JUL-21 21:56:00 (CST-6)
Location: SUNBURY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A Ham Radio operator relayed an estimated thunderstorm wind speed gust of 60 MPH , just west of New Liberty.

Tornado in DELAWARE, IOWA
From 14-JUL-21 18:54:00 to 14-JUL-21 18:56:00 (CST-6)
Location: MANCHESTER
Tornado F-scale: EF1
Reported by: Emergency Manager

An EF-1 tornado briefly touched down on the southwest side of town damaging several farm outbuildings and a large show barn. No injuries were reported.

Tornado in BENTON, IOWA
From 14-JUL-21 18:36:00 to 14-JUL-21 18:36:00 (CST-6)
Location: GARRISON
Tornado F-scale: EFU
Reported by: Public

Brief touchdown in a field with no visible damage.

Tornado in JONES, IOWA
From 14-JUL-21 21:30:00 to 14-JUL-21 21:34:00 (CST-6)
Location: CANTON
Tornado F-scale: EF1
Reported by: NWS Storm Survey

An EF-1 tornado tracked across rural Jones county snapping trees and ending just south of Canton.

Tornado in DELAWARE, IOWA
From 14-JUL-21 18:50:00 to 14-JUL-21 18:53:00 (CST-6)
Location: COFFINS GROVE PARK
Tornado F-scale: EF1
Reported by: Emergency Manager

Brief EF-1 tornado snapped large tree limbs and tree trunks southwest of Manchester.

Tornado in JONES, IOWA
From 14-JUL-21 20:44:00 to 14-JUL-21 20:48:00 (CST-6)
Location: LANGWORTHY
Tornado F-scale: EF1
Reported by: NWS Storm Survey

An EF-1 tornado touched down southwest of Monticello damaging outbuildings and snapping large trees on two farmsteads.

Thunderstorm Wind in CEDAR, IOWA
From 14-JUL-21 21:33:00 to 14-JUL-21 21:33:00 (CST-6)
Location: BUCHANAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A Cedar County Official estimated thunderstorm wind gusts up to 60 MPH generally 6 miles west of the Tipton area.

Thunderstorm Wind in JACKSON, IOWA
From 14-JUL-21 22:15:00 to 14-JUL-21 22:15:00 (CST-6)
Location: SPRINGBROOK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Law Enforcement relayed a public report of 60 MPH thunderstorm winds near Springbrook.

Tornado in BENTON, IOWA
From 14-JUL-21 19:07:00 to 14-JUL-21 19:07:00 (CST-6)
Location: VINTON
Tornado F-scale: EFU
Reported by: Storm Chaser

Brief touchdown in a field with no visible damage.

Tornado in LINN, IOWA
From 14-JUL-21 19:50:00 to 14-JUL-21 19:50:00 (CST-6)
Location: LAFAYETTE
Tornado F-scale: EFU
Reported by: Trained Spotter

Brief touchdown in a field with no visible damage.

Tornado in BENTON, IOWA
From 14-JUL-21 18:56:00 to 14-JUL-21 18:56:00 (CST-6)
Location: SHELLSBURG
Tornado F-scale: EFU
Reported by: Emergency Manager

Brief touchdown in a field with no visible damage.

Tornado in LINN, IOWA
From 14-JUL-21 19:52:00 to 14-JUL-21 19:52:00 (CST-6)
Location: CENTER PT
Tornado F-scale: EFU
Reported by: Emergency Manager

Brief touchdown in a field with no visible damage.

Tornado in BUCHANAN, IOWA
From 14-JUL-21 17:43:00 to 14-JUL-21 17:44:00 (CST-6)
Location: HAZLETON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Brief tornado touchdown in Buchanan County, which crossed into Fayette County at 17:44 LST, and then into Oelwein.

Thunderstorm Wind in LINN, IOWA
From 14-JUL-21 19:50:00 to 14-JUL-21 19:50:00 (CST-6)
Location: CENTER PT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a large area of flattened corn.

Thunderstorm Wind in BUCHANAN, IOWA
From 14-JUL-21 17:50:00 to 14-JUL-21 17:50:00 (CST-6)
Location: HAZLETON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Emergency Manager reported blown over corn damage mainly along and east of Highway 150. The time of the event was estimated using radar.

Tornado in BENTON, IOWA
From 14-JUL-21 18:08:00 to 14-JUL-21 18:19:00 (CST-6)
Location: GARRISON
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado began in Tama County and crossed into Benton County, just south of Dysart, around 6:08 pm CST. As the tornado entered Benton County, the max width was around 560 yards. This includes the main tornado and satellite vortices, which are supported by video evidence. The tornado caused damage to trees and farm outbuildings at a farmstead just over the county line. This damage was rated EF-1, with maximum winds around 100 mph. The tornado then followed an intermittent path to the east-northeast for about 4.5 miles through rural areas, before dissipating.

Tornado in DELAWARE, IOWA
From 14-JUL-21 20:40:00 to 14-JUL-21 20:41:00 (CST-6)
Location: BUCK CREEK
Tornado F-scale: EFU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Photos from a trained spotter and high resolution satellite data confirm a brief tornado in a corn field southwest of Hopkinton. The tornado did not cause any damage that could be used to assign an EF-scale rating. Time estimated by radar.

Tornado in BENTON, IOWA
From 14-JUL-21 18:19:00 to 14-JUL-21 18:19:00 (CST-6)
Location: GARRISON
Tornado F-scale: EFU
Reported by: Emergency Manager

Brief touchdown in a field with no visible damage.