A line of severe thunderstorms moved across northeast Iowa during the late afternoon of July 19th. These storms produced two tornadoes. The first, an EF-0, touched down north of Elma (Howard County) and damaged some crops. The second tornado, an EF-1, touched down west of McGregor (Clayton County) and then moved east through McGregor before dissipating over the Mississippi River. The tornado did extensive damage to the downtown area where two buildings were completely destroyed and numerous others were damaged. One person was killed in an accident cleaning up debris from the tornado when a tractor rolled and pinned the person beneath it. The storms produced a path of damaging winds from Nora Springs (Floyd County) and Mitchell (Osage County) east to Waukon (Allamakee County). Within this path, winds were estimated to range from 65 to 80 mph with numerous trees and power lines blown down. Southeast of Waukon, a barn was blown down trapping a farmer in the debris. The Governor of Iowa declared a disaster proclamation for Allamakee, Chickasaw, Clayton, Fayette, Floyd and Winneshiek Counties. The President of the United States issued a disaster declaration for Allamakee, Chickasaw, Fayette and Mitchell Counties.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 15:53:00 to 19-JUL-17 15:53:00 (CST-6)
Location: NORA SPGS
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees were blown down in Nora Springs.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 15:53:00 to 19-JUL-17 15:53:00 (CST-6)
Location: NORA SPGS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 65 mph wind gust occurred south of Nora Springs.

Thunderstorm Wind in MITCHELL, IOWA
From 19-JUL-17 15:54:00 to 19-JUL-17 15:54:00 (CST-6)
Location: ST ANSGAR
Magnitude: 48.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

At least 15 power lines were blown down in St. Ansgar.

Thunderstorm Wind in MITCHELL, IOWA
From 19-JUL-17 16:06:00 to 19-JUL-17 16:06:00 (CST-6)
Location: NEW HAVEN
Magnitude: 53.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

The catholic church in New Haven sustained wind damage.

Thunderstorm Wind in CHICKASAW, IOWA
From 19-JUL-17 16:20:00 to 19-JUL-17 16:20:00 (CST-6)
Location: NEW HAMPTON
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A 66 mph wind gust occurred in New Hampton.

Thunderstorm Wind in CLAYTON, IOWA
From 19-JUL-17 17:03:00 to 19-JUL-17 17:03:00 (CST-6)
Location: MONONA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Numerous trees and power lines were blown down just east of Monona. The strong winds also impacted some corn fields.

Thunderstorm Wind in CHICKASAW, IOWA
From 19-JUL-17 16:27:00 to 19-JUL-17 16:27:00 (CST-6)
Location: NEW HAMPTON
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Power lines were blown down east of New Hampton along State Highway 24.

Thunderstorm Wind in FAYETTE, IOWA
From 19-JUL-17 16:33:00 to 19-JUL-17 16:33:00 (CST-6)
Location: WAUCOMA
Magnitude: 53.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down in Waucoma.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 19-JUL-17 17:12:00 to 19-JUL-17 17:12:00 (CST-6)
Location: WAUKON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 5.00K
Reported by: Public

Part of a roof was removed from an outbuilding and corn was pushed over near Waukon.

Thunderstorm Wind in HOWARD, IOWA
From 19-JUL-17 16:45:00 to 19-JUL-17 16:45:00 (CST-6)
Location: CRESCO MUNI ARPT
Magnitude: 45.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were blown down in Cresco.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 15:53:00 to 19-JUL-17 15:53:00 (CST-6)
Location: NORA SPGS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 65 mph wind gust occurred north of Nora Springs.

Thunderstorm Wind in WINNESHIEK, IOWA
From 19-JUL-17 16:38:00 to 19-JUL-17 16:38:00 (CST-6)
Location: SPILLVILLE
Magnitude: 57.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were blown down in Spillville.

Thunderstorm Wind in FAYETTE, IOWA
From 19-JUL-17 16:49:00 to 19-JUL-17 16:49:00 (CST-6)
Location: CLERMONT
Magnitude: 52.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down in Clermont. At least one tree landed on a house and another destroyed a garage. Numerous trees and power lines were blown down in a campground on the southwest edge of town.

Thunderstorm Wind in FAYETTE, IOWA
From 19-JUL-17 16:42:00 to 19-JUL-17 16:42:00 (CST-6)
Location: WEST UNION
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees were blown down at the Fayette County Courthouse and fairgrounds in West Union.

Thunderstorm Wind in FAYETTE, IOWA
From 19-JUL-17 16:41:00 to 19-JUL-17 16:41:00 (CST-6)
Location: DOUGLAS
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Newspaper

Numerous trees were blown down on a farm northwest of West Union.

Thunderstorm Wind in FAYETTE, IOWA
From 19-JUL-17 16:41:00 to 19-JUL-17 16:41:00 (CST-6)
Location: ELDORADO
Magnitude: 45.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down in El Dorado.

Thunderstorm Wind in WINNESHIEK, IOWA
From 19-JUL-17 16:40:00 to 19-JUL-17 16:40:00 (CST-6)
Location: RIDGEWAY
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two foot diameter trees were blown down in Ridgeway.

Thunderstorm Wind in CLAYTON, IOWA
From 19-JUL-17 17:20:00 to 19-JUL-17 17:20:00 (CST-6)
Location: GUTTENBURG
Magnitude: 50.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees and power lines were blown down in Guttenberg.

Thunderstorm Wind in MITCHELL, IOWA
From 19-JUL-17 16:00:00 to 19-JUL-17 16:00:00 (CST-6)
Location: MITCHELL
Magnitude: 53.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power lines were blown down and a tree was snapped off northeast of Mitchell.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 19-JUL-17 17:14:00 to 19-JUL-17 17:14:00 (CST-6)
Location: MAUD
Magnitude: 52.00 EG
Property damage: 20.00K
Crop damage: 10.00K
Reported by: Storm Chaser

A tree was blown down onto a house, an outbuilding was damaged and corn was blown down south of Waukon.

Thunderstorm Wind in CLAYTON, IOWA
From 19-JUL-17 17:14:00 to 19-JUL-17 17:14:00 (CST-6)
Location: MARQUETTE
Magnitude: 50.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Hundreds of trees were blown down in Pikes Peak State Park and Effigy Mounds National Monument near Marquette. Some of the trees fell on vehicles in the two parks.

Thunderstorm Wind in WINNESHIEK, IOWA
From 19-JUL-17 16:54:00 to 19-JUL-17 16:54:00 (CST-6)
Location: DECORAH MUNI ARPT
Magnitude: 45.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Trees were snapped off or uprooted east of Decorah.

Tornado in HOWARD, IOWA
From 19-JUL-17 16:15:00 to 19-JUL-17 16:16:00 (CST-6)
Location: MAPLE LEAF
Tornado F-scale: EF0
Property damage: 12.00K
Crop damage: 5.00K
Reported by: Public

An EF-0 tornado touched down north of Elma and traveled a short distance to the northeast. The tornado pulled a corner of a pole shed out of the ground and drone footage showed a narrow path through a corn field.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 16:07:00 to 19-JUL-17 16:07:00 (CST-6)
Location: CHARLES CITY
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 Charles City.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 16:10:00 to 19-JUL-17 16:10:00 (CST-6)
Location: COLWELL
Magnitude: 54.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: COOP Observer

A 62 mph wind gust occurred in Colwell blowing down some tree branches.

Thunderstorm Wind in FLOYD, IOWA
From 19-JUL-17 15:56:00 to 19-JUL-17 15:56:00 (CST-6)
Location: FOLKERTS FLD ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 65 mph wind gust occurred in Rudd.

Thunderstorm Wind in MITCHELL, IOWA
From 19-JUL-17 15:50:00 to 19-JUL-17 15:50:00 (CST-6)
Location: CARPENTER
Magnitude: 55.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Broadcast Media

On a farm near Carpenter, tin silos were  twisted and large trees were blown down. On another farm, a downed tree fell on a house.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 19-JUL-17 17:15:00 to 19-JUL-17 17:15:00 (CST-6)
Location: ROSSVILLE
Magnitude: 53.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Newspaper

A farmer sustained injuries when the barn he was doing chores in was blown down on top of him.

Thunderstorm Wind in MITCHELL, IOWA
From 19-JUL-17 15:57:00 to 19-JUL-17 15:57:00 (CST-6)
Location: OSAGE
Magnitude: 61.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 70 mph wind gust occurred in Osage. Numerous trees were blown down with one blocking U.S. Highway 218.

Tornado in CLAYTON, IOWA
From 19-JUL-17 17:08:00 to 19-JUL-17 17:16:00 (CST-6)
Location: GIARD
Tornado F-scale: EF1
Property damage: 840.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-1 tornado touched down about 5 miles west of McGregor and then moved through McGregor before dissipating just east of town over the Mississippi River. The most damage occurred in McGregor with two buildings downtown completely destroyed while numerous others were damaged. Two people sustained minor injuries due to flying glass. Hundreds of trees across town were snapped off. West of McGregor, the tornado damaged a storage shed, ripped back part of a metal roof from an outbuilding and damaged numerous trees. One person was killed in an accident cleaning up debris when a tractor rolled over pinning the person underneath it.

Thunderstorm Wind in CHICKASAW, IOWA
From 19-JUL-17 16:20:00 to 19-JUL-17 16:20:00 (CST-6)
Location: ALTA VISTA
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 70 mph wind gust occurred in Alta Vista that blew down numerous trees.