An early morning squall line moved across northeast Iowa on June 22nd. This squall line produced winds of 60 to 70 mph and at least one tornado. The tornado destroyed one farm house near Maynard (Fayette County) causing injuries to both occupants of the house. Several other nearby farms sustained damage to crops, trees, and barns.  As the squall line moved across northeast Iowa it produced a swath of wind damage starting near Marble Rock (Floyd County) to around Guttenberg (Clayton County). Within this swath, a 65 mph wind gust was measured in Marble Rock that took down trees and power lines, around 17 farms sustained damage across southern Fayette County, and an Amish grocery store was destroyed near Garber (Clayton County). Preliminary damage estimates for Fayette County are in excess of $3 million. Locally heavy rains also produced some flash flooding with 480th Street washed out south of Stacyville (Floyd County) and Waterloo Creek came out of its banks near Dorchester (Allamakee County) within 30 minutes of the rain starting. The State of Iowa Governor issued a disaster proclamation for the following counties: Allamakee, Clayton, Howard, Mitchell and Winneshiek. A federal disaster declaration was made for Allamakee, Chickasaw, Clayton, Fayette, Howard, Mitchell and Winneshiek Counties.

Tornado in FAYETTE, IOWA
From 22-JUN-15 07:21:00 to 22-JUN-15 07:23:00 (CST-6)
Location: MAYNARD
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 100.00K
Reported by: NWS Storm Survey

The tornado started about 4 miles southeast of Maynard and ended approximately 5 miles southeast of Maynard. The tornado destroyed a farmhouse by moving it off its foundation and it then fell into the basement. Two people inside the house sustained non-life threatening injuries. The tornado also damaged crops, trees and farm buildings.

Flood in CLAYTON, IOWA
From 22-JUN-15 07:25:00 to 22-JUN-15 09:30:00 (CST-6)
Location: MC GREGOR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rain produced street flooding in McGregor.

Thunderstorm Wind in CLAYTON, IOWA
From 22-JUN-15 07:37:00 to 22-JUN-15 07:37:00 (CST-6)
Location: ELKPORT
Magnitude: 58.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An Amish grocery store near Garber was destroyed when the roof was blown off and some of the walls subsequently collapsed.

Hail in CLAYTON, IOWA
From 22-JUN-15 05:27:00 to 22-JUN-15 05:27:00 (CST-6)
Location: ELKADER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 30.00K
Reported by: Public

Quarter sized hail fell in Elkader. Around a 1000 acres of corn and beans were damaged by the hail northeast of Elkader.

Lightning in WINNESHIEK, IOWA
From 22-JUN-15 06:00:00 to 22-JUN-15 06:00:00 (CST-6)
Location: DECORAH
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A lightning strike took out the Decorah eagle web camera.

Hail in HOWARD, IOWA
From 22-JUN-15 05:48:00 to 22-JUN-15 05:48:00 (CST-6)
Location: CRESCO
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar sized hail was reported near Cresco.

Flash Flood in MITCHELL, IOWA
From 22-JUN-15 06:00:00 to 22-JUN-15 08:00:00 (CST-6)
Location: STACYVILLE
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rains caused the Little Cedar River to rapidly come out of its banks and wash out 480th Street between Monument and Ocean Avenues north of Stacyville.

Thunderstorm Wind in FLOYD, IOWA
From 22-JUN-15 06:37:00 to 22-JUN-15 06:37:00 (CST-6)
Location: MARBLE ROCK
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 65 mph wind gust occurred in Marble Rock that blew down trees and power lines. Two large, empty fertilizer bins were blown off their foundation.

Flood in FLOYD, IOWA
From 23-JUN-15 11:10:00 to 24-JUN-15 14:20:00 (CST-6)
Location: CHARLES CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rains caused the Cedar River to go out of its banks in Charles City. The river crested over two feet above the flood stage at 14.27 feet.

Flood in ALLAMAKEE, IOWA
From 22-JUN-15 12:15:00 to 23-JUN-15 07:20:00 (CST-6)
Location: CHESTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Heavy rains caused the Upper Iowa River to go out of its banks near Dorchester. The river crested around two and a half feet above the flood stage at 16.59 feet.

Thunderstorm Wind in CLAYTON, IOWA
From 22-JUN-15 07:52:00 to 22-JUN-15 07:52:00 (CST-6)
Location: GUTTENBURG
Magnitude: 58.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large area of wind damage occurred between Guttenberg and Millvile along U.S. Highway 52. A barn roof was blown off and several other barns were blown down near Millville. Numerous trees were blown down causing U.S. Highway 52 to be closed and a parked semi and trailer were overturned by the winds.

Flash Flood in ALLAMAKEE, IOWA
From 22-JUN-15 07:52:00 to 22-JUN-15 10:00:00 (CST-6)
Location: CHESTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Locally heavy rain caused Waterloo Creek to flood northwest of Dorchester within 30 minutes of the rain beginning.

Thunderstorm Wind in CLAYTON, IOWA
From 22-JUN-15 07:43:00 to 22-JUN-15 07:45:00 (CST-6)
Location: GARBER
Magnitude: 58.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Farm buildings were damaged or blown over along a path from Garber to about 2 miles southeast of Garber.

Thunderstorm Wind in CLAYTON, IOWA
From 22-JUN-15 07:50:00 to 22-JUN-15 07:50:00 (CST-6)
Location: OSTERDOCK
Magnitude: 50.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

Trees were blown down and one home sustained severe roof damage in Osterdock.

Thunderstorm Wind in FLOYD, IOWA
From 22-JUN-15 06:45:00 to 22-JUN-15 06:45:00 (CST-6)
Location: POWERSVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 890.00K
Reported by: Fire Department/Rescue

Fields of corn were flattened and large tree branches were blow down west of Nashua.

Thunderstorm Wind in CLAYTON, IOWA
From 22-JUN-15 07:31:00 to 22-JUN-15 07:58:00 (CST-6)
Location: STRAWBERRY PT
Magnitude: 58.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Numerous trees were blown down and barns damaged along a path from near Strawberry Point to North Buena Vista. Some cattle were killed from the damage that occurred to the barns.

Thunderstorm Wind in FAYETTE, IOWA
From 22-JUN-15 07:17:00 to 22-JUN-15 07:28:00 (CST-6)
Location: MAYNARD
Magnitude: 58.00 EG
Property damage: 3.10M
Crop damage: 0.00K
Reported by: Emergency Manager

A path of wind damage occurred across southern Fayette County. Numerous trees and power lines were downed, several roofs were blown off farm buildings, metal corn bins were caved in and pieces of siding and roofing were strewn throughout farm fields. One home was destroyed, 17 farms received major damage and 10 cows were killed.

Flash Flood in WINNESHIEK, IOWA
From 22-JUN-15 06:45:00 to 22-JUN-15 08:00:00 (CST-6)
Location: DECORAH TATRO ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rain in the Decorah area caused a small creek on the north side of town to go out of its banks. The flood waters damaged some homes as water went into basements.

Flood in HOWARD, IOWA
From 22-JUN-15 06:54:00 to 22-JUN-15 08:30:00 (CST-6)
Location: CRESCO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rain caused street flooding to occur in Cresco, temporarily causing law enforcement to close off some streets.

Flash Flood in MITCHELL, IOWA
From 22-JUN-15 07:17:00 to 22-JUN-15 09:30:00 (CST-6)
Location: BAILEY
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two small creeks north of McIntire went out of their banks and sent water over Walnut Avenue in the vicinity of 500th Street.

Thunderstorm Wind in CHICKASAW, IOWA
From 22-JUN-15 06:54:00 to 22-JUN-15 06:54:00 (CST-6)
Location: NASHUA
Magnitude: 62.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees were blown down in Nashua.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 22-JUN-15 07:10:00 to 22-JUN-15 07:10:00 (CST-6)
Location: WAUKON MUNI ARPT
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down south of Waukon.

Thunderstorm Wind in FAYETTE, IOWA
From 22-JUN-15 07:19:00 to 22-JUN-15 07:19:00 (CST-6)
Location: OELWEIN
Magnitude: 59.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were blown down across Oelwein. At least one home sustained roof damage from a fallen tree. The locally heavy rain also caused some minor street flooding.

Flood in ALLAMAKEE, IOWA
From 22-JUN-15 07:23:00 to 22-JUN-15 09:00:00 (CST-6)
Location: WAUKON MUNI ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rain caused some street flooding in Waukon.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 22-JUN-15 07:23:00 to 22-JUN-15 07:23:00 (CST-6)
Location: POSTVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down and the power knocked out in Postville.