Two lines of severe thunderstorms moved across northeast Iowa during the afternoon and evening of May 17th. This was the third day in a row that severe weather impacted the area. The storms primarily produced wind damage along with a weak tornado and some hail. The winds damaged a house and destroyed a machine shed east of Monona (Clayton County) and blew down several trees making roads impassable near Charles City (Floyd County). An EF-0 tornado briefly touched down northeast of Ridgeway (Winneshiek County) and damaged some trees.

Thunderstorm Wind in FLOYD, IOWA
From 17-MAY-17 17:08:00 to 17-MAY-17 17:08:00 (CST-6)
Location: MARBLE ROCK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A 60 mph wind gust occurred in Marble Rock.

Thunderstorm Wind in FLOYD, IOWA
From 17-MAY-17 17:11:00 to 17-MAY-17 17:11:00 (CST-6)
Location: FLOYD CROSSING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 60 mph gust occurred just northwest of Charles City.

Thunderstorm Wind in WINNESHIEK, IOWA
From 17-MAY-17 17:45:00 to 17-MAY-17 17:45:00 (CST-6)
Location: RIDGEWAY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 70 mph wind gust occurred in Ridgeway.

Thunderstorm Wind in WINNESHIEK, IOWA
From 17-MAY-17 15:04:00 to 17-MAY-17 15:04:00 (CST-6)
Location: RIDGEWAY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated 60 mph wind gust occurred southwest of Ridgeway.

Thunderstorm Wind in CLAYTON, IOWA
From 17-MAY-17 15:08:00 to 17-MAY-17 15:08:00 (CST-6)
Location: VOLGA
Magnitude: 53.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Large tree branches were blown down in Volga.

Thunderstorm Wind in CHICKASAW, IOWA
From 17-MAY-17 17:25:00 to 17-MAY-17 17:25:00 (CST-6)
Location: LAWLER
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down in Lawler.

Thunderstorm Wind in FAYETTE, IOWA
From 17-MAY-17 17:42:00 to 17-MAY-17 17:42:00 (CST-6)
Location: WAUCOMA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 58 mph wind gust occurred in Waucoma.

Thunderstorm Wind in CLAYTON, IOWA
From 17-MAY-17 18:00:00 to 17-MAY-17 18:00:00 (CST-6)
Location: GARBER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated 70 mph wind gust occurred in Garber.

Thunderstorm Wind in CLAYTON, IOWA
From 17-MAY-17 17:53:00 to 17-MAY-17 17:53:00 (CST-6)
Location: EDGEWOOD
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 70 mph wind gust occurred in Edgewood.

Tornado in WINNESHIEK, IOWA
From 17-MAY-17 17:50:00 to 17-MAY-17 17:51:00 (CST-6)
Location: BLUFFTON
Tornado F-scale: EF0
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A brief EF-0 tornado touched down northeast of Ridgeway. The tornado only produced some tree damage.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 17-MAY-17 15:26:00 to 17-MAY-17 15:26:00 (CST-6)
Location: WAUKON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated 60 mph wind gust occurred north of Waukon.

Thunderstorm Wind in CLAYTON, IOWA
From 17-MAY-17 15:27:00 to 17-MAY-17 15:27:00 (CST-6)
Location: FROELICH
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

North of Farmersburg, trees and power lines were blown down. Some house damage occurred from trees falling on them.

Hail in ALLAMAKEE, IOWA
From 17-MAY-17 15:33:00 to 17-MAY-17 15:33:00 (CST-6)
Location: HARPERS FERRY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in FLOYD, IOWA
From 17-MAY-17 16:05:00 to 17-MAY-17 16:05:00 (CST-6)
Location: COLWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Quarter sized hail fell east of Floyd.

Thunderstorm Wind in FLOYD, IOWA
From 17-MAY-17 17:05:00 to 17-MAY-17 17:05:00 (CST-6)
Location: CARRVILLE
Magnitude: 54.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees and power lines were blown down south of Charles City making some roads impassable.

Thunderstorm Wind in FLOYD, IOWA
From 17-MAY-17 17:10:00 to 17-MAY-17 17:10:00 (CST-6)
Location: CHARLES CITY
Magnitude: 51.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees were blown down in Charles City.

Thunderstorm Wind in FLOYD, IOWA
From 17-MAY-17 17:15:00 to 17-MAY-17 17:15:00 (CST-6)
Location: COLWELL
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An estimated 70 mph wind gust occurred in Colwell.

Thunderstorm Wind in CHICKASAW, IOWA
From 17-MAY-17 17:13:00 to 17-MAY-17 17:13:00 (CST-6)
Location: NEW HAMPTON
Magnitude: 45.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Some large trees were blown down in New Hampton.

Thunderstorm Wind in MITCHELL, IOWA
From 17-MAY-17 17:20:00 to 17-MAY-17 17:20:00 (CST-6)
Location: NEW HAVEN
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 68 mph wind gust occurred southeast of New Haven.

Thunderstorm Wind in CHICKASAW, IOWA
From 17-MAY-17 17:21:00 to 17-MAY-17 17:21:00 (CST-6)
Location: BASSETT
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 60 mph wind gust occurred in Bassett that damaged some trees.

Thunderstorm Wind in CHICKASAW, IOWA
From 17-MAY-17 17:25:00 to 17-MAY-17 17:25:00 (CST-6)
Location: ALTA VISTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 60 mph wind gust occurred in Alta Vista.

Thunderstorm Wind in MITCHELL, IOWA
From 17-MAY-17 17:27:00 to 17-MAY-17 17:27:00 (CST-6)
Location: OSAGE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down in Osage.

Thunderstorm Wind in CLAYTON, IOWA
From 17-MAY-17 15:35:00 to 17-MAY-17 15:35:00 (CST-6)
Location: MONONA MUNI ARPT
Magnitude: 52.00 EG
Property damage: 110.00K
Crop damage: 0.00K
Reported by: Public

A machine shed was destroyed and a house damaged east of Monona.

Thunderstorm Wind in WINNESHIEK, IOWA
From 17-MAY-17 18:02:00 to 17-MAY-17 18:02:00 (CST-6)
Location: CASTALIA
Magnitude: 48.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down in Castalia.