A complex of severe thunderstorms moved across northeast Iowa during the late afternoon and early evening of June 9th. These severe storms produced up to 75 mph wind gusts in and near Rockford (Floyd County) with  extensive damage in town. At least 300 hundred trees were destroyed with some structural damage to buildings. A light pole at the high school football field was blown down onto storage buildings for the baseball and softball fields. An estimated 80 mph wind gust occurred west of Floyd (Floyd County). These storms also produced up to golf ball sized hail near Nora Springs (Floyd County) and west of Charles City (Floyd County). A section of the Avenue of the Saints was closed south of Charles City to allow utility crews to repair power lines. This complex was then followed by another round of thunderstorms later in the evening and the combined rainfall produced flash flooding that sent water over numerous roads across parts of Floyd, Fayette and Winneshiek Counties.

Flash Flood in FAYETTE, IOWA
From 09-JUN-18 20:21:00 to 09-JUN-18 23:30:00 (CST-6)
Location: WESTGATE
Flood cause: Heavy Rain
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Runoff from heavy rain pushed several small creeks out of their banks over the southwest part of Fayette County. Several roads west and southwest of Maynard were covered by floodwaters, including State Highway 150 between Maynard and Oelwein.

Thunderstorm Wind in WINNESHIEK, IOWA
From 09-JUN-18 18:14:00 to 09-JUN-18 18:14:00 (CST-6)
Location: BLUFFTON
Magnitude: 40.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down near Bluffton.

Thunderstorm Wind in CLAYTON, IOWA
From 09-JUN-18 18:35:00 to 09-JUN-18 18:35:00 (CST-6)
Location: VOLGA
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trained spotters reported trees down and strong wind gusts west of town.

Hail in FLOYD, IOWA
From 09-JUN-18 15:27:00 to 09-JUN-18 15:27:00 (CST-6)
Location: NORA SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 174.00K
Reported by: Fire Department/Rescue

Golf ball sized hail fell south of Nora Springs.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:30:00 to 09-JUN-18 15:30:00 (CST-6)
Location: ROCKFORD
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

A farm outbuilding was destroyed with debris scattered across the street and through a field west of Rockford. The fire department estimated a 75 mph wind gust.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:30:00 to 09-JUN-18 15:30:00 (CST-6)
Location: ROCKFORD
Magnitude: 65.00 EG
Property damage: 170.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

At least 300 hundred trees were destroyed in Rockford. Some hay racks were blown across a farm and through a fence. The fire department estimated a 75 mph wind gust.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:37:00 to 09-JUN-18 15:37:00 (CST-6)
Location: RUDD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The fire department estimated a 70 mph wind gust just west of Rudd.

Hail in FLOYD, IOWA
From 09-JUN-18 15:50:00 to 09-JUN-18 15:50:00 (CST-6)
Location: ROSEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter sized hail was reported east of Rockford.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:55:00 to 09-JUN-18 15:55:00 (CST-6)
Location: CHARLES CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 60 mph wind gust occurred west of Charles City.

Hail in FLOYD, IOWA
From 09-JUN-18 15:55:00 to 09-JUN-18 15:55:00 (CST-6)
Location: CHARLES CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 250.00K
Reported by: Trained Spotter

Up to golf ball sized hail fell west of Charles City.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 16:00:00 to 09-JUN-18 16:00:00 (CST-6)
Location: FLOYD
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 80 mph wind gust occurred west of Floyd.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:31:00 to 09-JUN-18 15:31:00 (CST-6)
Location: ROCKFORD
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous power lines were blown down across the west central section of Floyd County in the general vicinity of Rockford.

Flash Flood in FLOYD, IOWA
From 09-JUN-18 16:22:00 to 09-JUN-18 23:59:00 (CST-6)
Location: NORA SPGS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Runoff from heavy rain pushed numerous streams across Floyd County out of their banks. Several roads had flood waters across them and were closed.

Thunderstorm Wind in CHICKASAW, IOWA
From 09-JUN-18 16:29:00 to 09-JUN-18 16:29:00 (CST-6)
Location: NASHUA
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 Nashua.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 16:27:00 to 09-JUN-18 16:27:00 (CST-6)
Location: CARRVILLE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Antennas and tree limbs were blown down by an estimated 60 mph wind gust at the Iowa State University agriculture farm west of Nashua.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 16:24:00 to 09-JUN-18 16:24:00 (CST-6)
Location: CHARLES CITY ARPT
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The automated weather observing equipment at the Charles City airport measured a 71 mph wind gust.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 16:17:00 to 09-JUN-18 16:17:00 (CST-6)
Location: WALLER
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The power was out in Charles City from downed power lines.

Hail in CHICKASAW, IOWA
From 09-JUN-18 16:59:00 to 09-JUN-18 16:59:00 (CST-6)
Location: WILLIAMSTOWN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter sized hail fell south of New Hampton.

Thunderstorm Wind in CHICKASAW, IOWA
From 09-JUN-18 16:59:00 to 09-JUN-18 16:59:00 (CST-6)
Location: WILLIAMSTOWN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 65 mph wind gust occurred south of New Hampton.

Thunderstorm Wind in FAYETTE, IOWA
From 09-JUN-18 18:07:00 to 09-JUN-18 18:07:00 (CST-6)
Location: WEST UNION
Magnitude: 45.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were blown down in West Union.

Flash Flood in WINNESHIEK, IOWA
From 09-JUN-18 19:00:00 to 10-JUN-18 01:45:00 (CST-6)
Location: KENDALLVILLE
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Runoff from heavy rain pushed Minor Creek out of its banks near Kendallville. The floodwaters were 1 to 2 feet deep over some rural roads.

Flood in ALLAMAKEE, IOWA
From 10-JUN-18 04:01:00 to 10-JUN-18 07:15:00 (CST-6)
Location: WAUKON JCT
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Runoff from heavy rains pushed the Yellow River out of its banks across southern Allamakee County. Several roads were closed because of the flooding.

Heavy Rain in WINNESHIEK, IOWA
From 09-JUN-18 17:15:00 to 09-JUN-18 22:11:00 (CST-6)
Location: JACKSON JCT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Near Jackson Junction, a mesonet station measured 6.36 inches of rain.

Heavy Rain in FAYETTE, IOWA
From 09-JUN-18 18:00:00 to 09-JUN-18 22:00:00 (CST-6)
Location: MAYNARD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

In Maynard, 5.2 inches of rain fell.

Heavy Rain in CHICKASAW, IOWA
From 09-JUN-18 16:45:00 to 09-JUN-18 20:45:00 (CST-6)
Location: NEW HAMPTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

In New Hampton, a mesonet station measured 4.08 inches of rain.

Heavy Rain in ALLAMAKEE, IOWA
From 09-JUN-18 18:30:00 to 10-JUN-18 00:45:00 (CST-6)
Location: HARDIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

West of Volney, 3.41 inches of rain fell.

Heavy Rain in HOWARD, IOWA
From 09-JUN-18 15:10:00 to 09-JUN-18 21:45:00 (CST-6)
Location: CRESCO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer near Cresco measured 3.37 inches of rain.

Heavy Rain in CLAYTON, IOWA
From 09-JUN-18 19:55:00 to 10-JUN-18 01:10:00 (CST-6)
Location: MC GREGOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Near McGregor, a mesonet station measured 3.36 inches of rain.

Hail in MITCHELL, IOWA
From 09-JUN-18 12:05:00 to 09-JUN-18 12:05:00 (CST-6)
Location: OSAGE
Magnitude: 1.00 
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in CLAYTON, IOWA
From 09-JUN-18 20:45:00 to 09-JUN-18 23:30:00 (CST-6)
Location: STRAWBERRY PT
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding was reported over several secondary roads in the county.

Thunderstorm Wind in ALLAMAKEE, IOWA
From 09-JUN-18 18:10:00 to 09-JUN-18 18:10:00 (CST-6)
Location: WAUKON
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were blown down west of Waukon.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 15:30:00 to 09-JUN-18 15:30:00 (CST-6)
Location: ROCKFORD
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

The Rockford High School baseball/softball complex sustained extensive damage when a light pole was blown down on the concessions and storage buildings, bleachers were blown through or up against fencing for the fields and trees and limbs were downed.

Thunderstorm Wind in FLOYD, IOWA
From 09-JUN-18 16:18:00 to 09-JUN-18 16:18:00 (CST-6)
Location: CHARLES CITY
Magnitude: 52.00 MG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated 60 mph wind gust occurred just south of Charles City. A section of the Avenue of Saints was closed to allow utility crews to repair power lines.