A long duration convective event along a stalled boundary occurred. This resulted in a major heavy rain and flooding event from 3 to over 8 inches of rain falling. Some storms become severe with damaging winds over 60 mph and isolated large hail.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 21-JUL-17 17:32:00 to 21-JUL-17 17:32:00 (CST-6)
Location: FREEPORT
Magnitude: 50.00 EG
Property damage: 0.25K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The local fire department reported a tree branch fell and brought down a power line.

Tornado in WHITESIDE, ILLINOIS
From 21-JUL-17 18:19:00 to 21-JUL-17 18:26:00 (CST-6)
Location: FULTON
Tornado F-scale: EF1
Property damage: 40.00K
Crop damage: 2.00K
Reported by: NWS Storm Survey

Tornado was rated an EF-1 which touched down on the eastern shore of the Mississippi River and hit the city of Fulton Illinois.  The tornado tracked east northeast and caused damage to mainly trees and a cemetery along its 3.7 mile path and max width of 150 yards.   Two garages and one farm outbuilding, and some corn were also damaged.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 21-JUL-17 18:21:00 to 21-JUL-17 18:21:00 (CST-6)
Location: FULTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported trees down across the town of Fulton.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 21-JUL-17 18:24:00 to 21-JUL-17 18:24:00 (CST-6)
Location: FULTON
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported a barn was blown down.

Flash Flood in JO DAVIESS, ILLINOIS
From 21-JUL-17 20:00:00 to 22-JUL-17 20:00:00 (CST-6)
Location: EAST DUBUQUE
Flood cause: Heavy Rain
Property damage: 6.50M
Crop damage: 1.00M
Reported by: Emergency Manager

Widespread flash flooding occurred throughout the county from 3 to over 9 inches of rain.  Almost 1000 structures were flooded.  Two water treatment sewage plants sustained damage with thousands of acres of crops lost.  Preliminary damage estimates are between 7 and 8 million dollars.

Flash Flood in STEPHENSON, ILLINOIS
From 21-JUL-17 20:00:00 to 21-JUL-17 23:00:00 (CST-6)
Location: LAKE LEAQUANA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported Highway 73 at Louisa Road was closed due to flooding.

Flash Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 02:37:00 to 22-JUL-17 05:37:00 (CST-6)
Location: APPLE RIVER CANYON SP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported numerous vehicles were stranded in high water.

Flash Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 00:33:00 to 24-JUL-17 03:33:00 (CST-6)
Location: APPLE RIVER CANYON SP
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a brand new bridge was washed on the main road out of Stockton.  The spotter reported it was the worst flooding he had ever seen in over 20 years.

Flash Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 00:04:00 to 22-JUL-17 06:04:00 (CST-6)
Location: STOCKTON
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported widespread flooding in the town of Stockton. Rainfall totals reached 7.81 inches in 6 hours.

Flash Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 03:11:00 to 22-JUL-17 06:11:00 (CST-6)
Location: STOCKTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Illinois Department of Highways reported Highway 20 east of Stockton was closed due to high water.

Flash Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 03:11:00 to 22-JUL-17 06:11:00 (CST-6)
Location: ELMOVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Illinois Department of Highways reported Route 78 north of the Carroll County line was closed due to water.

Flash Flood in STEPHENSON, ILLINOIS
From 22-JUL-17 03:11:00 to 22-JUL-17 06:11:00 (CST-6)
Location: PEARL CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Illinois Department of Highways reported Route 73 near Pearl City was Flooded.

Flood in STEPHENSON, ILLINOIS
From 22-JUL-17 11:50:00 to 22-JUL-17 17:50:00 (CST-6)
Location: LENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported widespread flooding. A road was underwater for at least the length of a football field in a location does not normally flood.

Flash Flood in STEPHENSON, ILLINOIS
From 21-JUL-17 23:15:00 to 21-JUL-17 23:15:00 (CST-6)
Location: LENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported 4 road closures in Stephenson County due to flash flooding. Highway 20 west was closed at Damier Road. Highway 20 was closed at Kiever Road. Highway 20 was closed west of Galena Road to the county line.  Highway 73 was closed west of Louisa Road.

Flash Flood in CARROLL, ILLINOIS
From 22-JUL-17 01:20:00 to 22-JUL-17 04:20:00 (CST-6)
Location: CHADWICK
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported a guard rail was washed out on Route 40 near Chadwick.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 21-JUL-17 18:16:00 to 21-JUL-17 18:16:00 (CST-6)
Location: ANDALUSIA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported wind knocked down a 5 inch in diameter healthy tree branch off a silver maple tree.

Flood in JO DAVIESS, ILLINOIS
From 22-JUL-17 09:13:00 to 22-JUL-17 21:13:00 (CST-6)
Location: GALENA
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The county emergency manager reported that the Galena River was flooded and the flood gates are closed in Galena.  Numerous grade crossings were under water or damaged.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 21-JUL-17 18:18:00 to 21-JUL-17 18:18:00 (CST-6)
Location: TAYLOR RIDGE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported power lines were down.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 21-JUL-17 18:20:00 to 21-JUL-17 18:20:00 (CST-6)
Location: MILAN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of 2 to 4 inch in diameter tree limbs were down.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 21-JUL-17 18:25:00 to 21-JUL-17 18:25:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 62.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust of 71 mph was measured by the Moline Airport ASOS site.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 21-JUL-17 18:34:00 to 21-JUL-17 18:34:00 (CST-6)
Location: MOLINE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of 2 to 4 inch in diameter tree limbs down.

Flash Flood in STEPHENSON, ILLINOIS
From 21-JUL-17 20:00:00 to 22-JUL-17 03:00:00 (CST-6)
Location: PEARL CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Illinois Department of Highways reported Route 73 near Pearl City was flooded.

Thunderstorm Wind in CARROLL, ILLINOIS
From 21-JUL-17 18:48:00 to 21-JUL-17 18:48:00 (CST-6)
Location: MILLEDGEVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report was received of 3 inch in diameter tree branches down.

Flash Flood in STEPHENSON, ILLINOIS
From 21-JUL-17 20:00:00 to 22-JUL-17 05:00:00 (CST-6)
Location: BUENA VISTA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported portions of several county roads closed due to high water.

Flash Flood in CARROLL, ILLINOIS
From 21-JUL-17 21:47:00 to 21-JUL-17 21:47:00 (CST-6)
Location: SAVANNA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported a gravel road was washed out.