Thunderstorms with high winds and extremely heavy rain moved across northeast Iowa during the evening of September 21st into the early morning of the 22nd. Winds of 60 to 70 mph occurred near Rockford (Floyd County) and Nora Springs (Floyd County). A small tornado touched down west of Nashua (Floyd County) and produced some crop damage. Flash flooding caused water to cover most roads over the southern two-thirds of Floyd County along with the southern sections of Chickasaw County and mudslides occurred across Allamakee County. The Governor of Iowa signed a disaster proclamation because of all the flooding in September for Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard, Mitchell and Winneshiek Counties and a federal disaster declaration was made for the same counties.

Flash Flood in ALLAMAKEE, IOWA
From 21-SEP-16 06:30:00 to 21-SEP-16 08:30:00 (CST-6)
Location: NEW ALBIN
Flood cause: Heavy Rain
Property damage: 13.00K
Crop damage: 33.00K
Reported by: Law Enforcement

At least two mudslides occurred along State Highway 26 between New Albin and Lansing.

Tornado in FLOYD, IOWA
From 21-SEP-16 17:32:00 to 21-SEP-16 17:35:00 (CST-6)
Location: POWERSVILLE
Tornado F-scale: EF0
Property damage: 3.00K
Crop damage: 3.00K
Reported by: Trained Spotter

A weak tornado touched down west of Nashua. The tornado moved through rural areas producing only some crop damage.

Flash Flood in WINNESHIEK, IOWA
From 22-SEP-16 01:05:00 to 22-SEP-16 04:00:00 (CST-6)
Location: DECORAH TATRO ARPT
Flood cause: Heavy Rain
Property damage: 56.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flooding to occur in the Bluffton area along the Upper Iowa River and Pine and Silver Creeks. Street flooding occurred in Decorah.

Flood in CLAYTON, IOWA
From 22-SEP-16 13:10:00 to 25-SEP-16 12:55:00 (CST-6)
Location: GARBER
Flood cause: Heavy Rain
Property damage: 12.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Turkey River out of its banks in Garber. The river crested over eight feet above the flood stage at 25.15 feet.

Flood in MITCHELL, IOWA
From 22-SEP-16 12:30:00 to 25-SEP-16 00:35:00 (CST-6)
Location: OSAGE
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Cedar River out of its banks near Osage. The river crested almost six feet above the flood stage at 27.78 feet.

Flood in FLOYD, IOWA
From 22-SEP-16 08:10:00 to 25-SEP-16 20:40:00 (CST-6)
Location: CHARLES CITY
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Cedar River out of its banks in Charles City. The river crested nine feet above the flood stage at 21 feet.

Flood in HOWARD, IOWA
From 22-SEP-16 05:34:00 to 22-SEP-16 08:45:00 (CST-6)
Location: VERNON SPGS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Roads west of Cresco had water over them because of runoff from heavy rain. Water also covered roads around Vernon Springs.

Flood in CLAYTON, IOWA
From 22-SEP-16 07:25:00 to 25-SEP-16 19:05:00 (CST-6)
Location: ELKADER
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 5.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Turkey River out of its banks in Elkader. The river crested over eight feet above the flood stage at 20.65 feet.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 15:13:00 to 21-SEP-16 15:13:00 (CST-6)
Location: NORA SPGS
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A wind gust of 66 mph was measured south of Nora Springs.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 15:25:00 to 21-SEP-16 15:25:00 (CST-6)
Location: NORA SPGS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was blown down onto a house in Nora Springs.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 16:10:00 to 21-SEP-16 16:10:00 (CST-6)
Location: ROCKFORD
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees were blown down west of Rockford.

Flash Flood in CHICKASAW, IOWA
From 22-SEP-16 03:56:00 to 22-SEP-16 09:00:00 (CST-6)
Location: NASHUA
Flood cause: Heavy Rain
Property damage: 48.00K
Crop damage: 5.00K
Reported by: Law Enforcement

The fire department had to pump water out of basements in Nashua and volunteers helped sandbag homes in both Nashua and Ionia. Flood waters from the Wapsipinicon River covered U.S. Highway 18 west of New Hampton. For the second time this month, school was canceled in the New Hampton school district because of flooding.

Hail in FLOYD, IOWA
From 21-SEP-16 16:06:00 to 21-SEP-16 16:06:00 (CST-6)
Location: ROCKFORD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Ping pong ball sized hail fell in Rockford.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 16:06:00 to 21-SEP-16 16:06:00 (CST-6)
Location: NORA SPGS
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees were blown down in Nora Springs.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 16:33:00 to 21-SEP-16 16:33:00 (CST-6)
Location: AUREOLA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

An estimated wind gust of 70 mph occurred west of Marble Rock.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 16:50:00 to 21-SEP-16 16:50:00 (CST-6)
Location: MARBLE ROCK
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Trees, two to three foot in diameter, were blown down just southeast of Marble Rock.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 17:20:00 to 21-SEP-16 17:20:00 (CST-6)
Location: MARBLE ROCK
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Machine sheds were blown down and destroyed southeast of Marble Rock.

Flash Flood in FLOYD, IOWA
From 21-SEP-16 18:30:00 to 22-SEP-16 09:30:00 (CST-6)
Location: FOLKERTS FLD ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rain caused water to go over several roads in the southwest two-thirds of Floyd County. The roads were impassable making travel not possible. Water was reported to still be rising southwest of Charles City after sunrise on the 22nd.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 18:44:00 to 21-SEP-16 18:44:00 (CST-6)
Location: AUREOLA
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A wind gust of 60 mph occurred just west of Marble Rock.

Thunderstorm Wind in FLOYD, IOWA
From 21-SEP-16 18:44:00 to 21-SEP-16 18:44:00 (CST-6)
Location: MARBLE ROCK
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A wind gust of 70 mph occurred just east of Marble Rock.

Heavy Rain in FLOYD, IOWA
From 21-SEP-16 16:35:00 to 21-SEP-16 22:00:00 (CST-6)
Location: CARRVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

West of Nashua, 7.55 inches of rain fell.

Flood in MITCHELL, IOWA
From 22-SEP-16 03:39:00 to 22-SEP-16 07:45:00 (CST-6)
Location: QUANDAHL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Runoff from heavy rains caused water to cover the roads in Carpenter. Water was also over roads near Stacyville.

Flash Flood in FAYETTE, IOWA
From 22-SEP-16 03:51:00 to 22-SEP-16 13:15:00 (CST-6)
Location: HAWKEYE
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood waters from Crane Creek covered U.S. Highway 18 northeast of Hawkeye and the streets were flooded in Hawkeye. Numerous roads between West Union and Sumner had water over them.

Heavy Rain in CHICKASAW, IOWA
From 21-SEP-16 15:35:00 to 22-SEP-16 06:45:00 (CST-6)
Location: CHICKASAW
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Near Ionia, 6.38 inches of rain fell.

Heavy Rain in MITCHELL, IOWA
From 21-SEP-16 16:30:00 to 22-SEP-16 06:04:00 (CST-6)
Location: ST ANSGAR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

In St. Ansgar, 3.00 inches of rain fell.

Heavy Rain in CHICKASAW, IOWA
From 21-SEP-16 16:25:00 to 22-SEP-16 06:00:00 (CST-6)
Location: NEW HAMPTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

In New Hampton, 3.59 inches of rain fell.

Flash Flood in CLAYTON, IOWA
From 22-SEP-16 06:43:00 to 22-SEP-16 11:00:00 (CST-6)
Location: MONONA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Sections of County Highway B45 were washed out near Monona. Sandbagging occurred in Farmersburg to protect the community from flood waters on Howard Creek.

Heavy Rain in FAYETTE, IOWA
From 21-SEP-16 18:25:00 to 22-SEP-16 05:00:00 (CST-6)
Location: WAUCOMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

In Waucoma, 3.91 inches of rain fell.

Heavy Rain in FLOYD, IOWA
From 21-SEP-16 15:15:00 to 22-SEP-16 05:55:00 (CST-6)
Location: CHARLES CITY ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The automated weather observing equipment at the Charles City airport measured 4.79 inches of rain.

Flash Flood in ALLAMAKEE, IOWA
From 22-SEP-16 03:34:00 to 22-SEP-16 11:30:00 (CST-6)
Location: WAUKON JCT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Runoff from heavy rain caused 4 to 5 mudslides to occur across Allamakee County. Mudslides north of Lansing sent downed trees on to some roads. Flooding in the Yellow River State Forest prompted officials to close all the campgrounds.

Heavy Rain in FLOYD, IOWA
From 21-SEP-16 14:20:00 to 22-SEP-16 06:00:00 (CST-6)
Location: NORA SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Near Nora Springs, 9.36 inches of rain fell.

Heavy Rain in HOWARD, IOWA
From 21-SEP-16 17:10:00 to 22-SEP-16 07:04:00 (CST-6)
Location: RICEVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Near Riceville, 4.54 inches of rain fell.

Heavy Rain in FLOYD, IOWA
From 21-SEP-16 15:00:00 to 22-SEP-16 06:00:00 (CST-6)
Location: CHARLES CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Charles City measured 6.35 inches of rain.

Heavy Rain in ALLAMAKEE, IOWA
From 21-SEP-16 18:30:00 to 22-SEP-16 07:00:00 (CST-6)
Location: DORCHESTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer near Dorchester measured 4.21 inches of rain.

Flood in ALLAMAKEE, IOWA
From 22-SEP-16 03:50:00 to 24-SEP-16 20:15:00 (CST-6)
Location: CHESTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Upper Iowa River out of its banks near Dorchester. The river crested over three feet above the flood stage at 17.19 feet.

Flood in WINNESHIEK, IOWA
From 22-SEP-16 05:55:00 to 23-SEP-16 21:20:00 (CST-6)
Location: SPILLVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Turkey River out of its banks in Spillville. The river crested almost five above the flood stage at 13.73 feet.

Flood in FAYETTE, IOWA
From 22-SEP-16 03:55:00 to 24-SEP-16 13:50:00 (CST-6)
Location: ELDORADO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Turkey River out of its banks near Eldorado. The river crested over four feet above the flood stage at 17.12 feet.

Flood in FAYETTE, IOWA
From 22-SEP-16 06:35:00 to 24-SEP-16 13:35:00 (CST-6)
Location: CLERMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rain pushed the Turkey River out of its banks in Clermont. The river crested a foot and a half above the flood stage at 17.66 feet.

Flash Flood in MITCHELL, IOWA
From 21-SEP-16 19:00:00 to 21-SEP-16 23:15:00 (CST-6)
Location: OTRANTO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Flood waters covered several rural roads in the western sections of Mitchell County.