A cold front from Lake Superior across northwest Iowa coupled with an upper level low over southwest Ontario with an associated short wave dropping across southern Minnesota sparked the development of thunderstorms during the afternoon and evening of July 24. Severe storms producing copious amounts of large hail up to the size of a tennis ball and damaging wind gusts between 60 and 90 mph were common. An isolated tornado touched down near Princeton, IL around 950 pm.

Thunderstorm Wind in BUREAU, ILLINOIS
From 24-JUL-09 20:57:00 to 24-JUL-09 20:57:00 (CST-6)
Location: PRINCETON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 85 mph blew down several trees in Princeton, IL around 957 pm July 24.  A power outage was observed in Princeton, IL, Walnut, IL, and Ohio, IL.

Thunderstorm Wind in WARREN, ILLINOIS
From 24-JUL-09 21:56:00 to 24-JUL-09 21:56:00 (CST-6)
Location: MONMOUTH
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew down some power poles in Monmouth, IL around 1056 pm July 24.

Thunderstorm Wind in WARREN, ILLINOIS
From 24-JUL-09 22:00:00 to 24-JUL-09 22:00:00 (CST-6)
Location: CAMERON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down several 2 to 4 inch diameter tree limbs about 2 miles southeast of Cameron, IL around 1100 pm July 24.

Thunderstorm Wind in WARREN, ILLINOIS
From 24-JUL-09 21:58:00 to 24-JUL-09 21:58:00 (CST-6)
Location: MONMOUTH
Magnitude: 61.00 EG
Property damage: 2.50K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew down some power lines on the south end of Monmouth, IL around 1058 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 18:07:00 to 24-JUL-09 18:07:00 (CST-6)
Location: ELIZABETH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in HENRY, ILLINOIS
From 24-JUL-09 20:20:00 to 24-JUL-09 20:20:00 (CST-6)
Location: GREEN ROCK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew down several trees in Colona, IL around 920 pm July 24.

Thunderstorm Wind in HENRY, ILLINOIS
From 24-JUL-09 20:21:00 to 24-JUL-09 20:21:00 (CST-6)
Location: GREEN ROCK
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew a tree down onto a van in Colona, IL around 921 pm July 24.  One person was injured which required transport to the hospital.

Flash Flood in WHITESIDE, ILLINOIS
From 24-JUL-09 20:40:00 to 24-JUL-09 23:00:00 (CST-6)
Location: STERLING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rains resulted in flash flooding of a portion of Highway 40 in Sterling, IL during the late evening hours of July 24.  The roadway had to be closed for a time due to water over the road.

Thunderstorm Wind in WARREN, ILLINOIS
From 24-JUL-09 22:15:00 to 24-JUL-09 22:15:00 (CST-6)
Location: BERWICK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated to be 50 to 60 mph about 3 miles east of Berwick, IL around 1115 pm July 24.

Flash Flood in HENRY, ILLINOIS
From 24-JUL-09 21:25:00 to 24-JUL-09 22:30:00 (CST-6)
Location: NEKOMA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rains resulted in flash flooding of the intersection of Highway 82 and Highway 17 about 9 miles south of Cambridge, IL during the late evening hours of July 24.  The roadways were flooded and ditches were full.

Hail in STEPHENSON, ILLINOIS
From 24-JUL-09 17:15:00 to 24-JUL-09 17:15:00 (CST-6)
Location: KENT
Magnitude: 2.00 
Property damage: 50.00K
Reported by: Trained Spotter

Hail estimated to be 2 inches in diameter fell about 1.5 miles north northeast of Kent, IL around 615 pm July 24.  The hail caused widespread crop damage as well as damage to some residences and vehicles in the area.

Tornado in BUREAU, ILLINOIS
From 24-JUL-09 20:50:00 to 24-JUL-09 20:55:00 (CST-6)
Location: PRINCETON PIPER ARPT
Tornado F-scale: EF1
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

On the evening of July 24, a line of severe thunderstorms moved through Bureau County.  This line intensified over Princeton, IL producing a series of down-bursts which resulted in straight-line winds of 80 to 90 mph and the formation of a brief EF1 tornado with wind speeds estimated to be around 105 mph.  The tornado formed in a field southeast of town around 950 pm and tracked east southeast where it caused damage to a farmstead near Highway 26.  It dissipated in a field east of Highway 26 around 955 pm.  The farm had one barn completely destroyed. Debris from the barn damaged the house and some vehicles.  A two by six board was driven into the side of the garage.  A grain bin just north of the house was also destroyed.  Trees and power poles at the property were snapped.

Thunderstorm Wind in BUREAU, ILLINOIS
From 24-JUL-09 20:50:00 to 24-JUL-09 20:50:00 (CST-6)
Location: PRINCETON
Magnitude: 71.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An 82 mph wind gust was measured in Princeton, IL around 950 pm July 24.

Flash Flood in ROCK ISLAND, ILLINOIS
From 24-JUL-09 21:15:00 to 24-JUL-09 22:00:00 (CST-6)
Location: MILAN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rains resulted in flash flooding of some streets, including Highway 67, in Milan, IL during the late evening of July 24.

Thunderstorm Wind in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:55:00 to 24-JUL-09 17:55:00 (CST-6)
Location: EAST DUBUQUE
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 70 mph blew a garage down at 7427 Main Street about 4 miles east of East Dubuque, IL around 655 pm July 24.  A boat and truck stored inside the garage were also destroyed.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:09:00 to 24-JUL-09 17:09:00 (CST-6)
Location: STOCKTON ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Golf ball-sized hail fell about 3 miles south of Stockton, IL around 609 pm July 24.

Hail in STEPHENSON, ILLINOIS
From 24-JUL-09 17:25:00 to 24-JUL-09 17:25:00 (CST-6)
Location: PEARL CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 24-JUL-09 17:33:00 to 24-JUL-09 17:33:00 (CST-6)
Location: PEARL CITY
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph broke a telephone pole near the intersection of Pearl City Road and Mill Grove Road about 1 mile east of Pearl City, IL around 633 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:49:00 to 24-JUL-09 17:49:00 (CST-6)
Location: COUNCIL HILL STATION
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball-sized hail fell in Council Hill, IL around 649 pm July 24.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 24-JUL-09 17:51:00 to 24-JUL-09 17:51:00 (CST-6)
Location: BOLTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down some 4 to 6 inch diameter tree limbs about 3 miles west southwest of Freeport, IL around 651 pm.  In addition, heavy rains of about 1.10 inches fell in about 15 minutes.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 16:52:00 to 24-JUL-09 16:52:00 (CST-6)
Location: APPLE RIVER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Golf ball-sized hail fell in Apple River, IL around 552 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 16:58:00 to 24-JUL-09 16:58:00 (CST-6)
Location: STOCKTON
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Tennis ball-sized hail fell 2 miles north of Stockton, IL around 558 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:04:00 to 24-JUL-09 17:04:00 (CST-6)
Location: STOCKTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Golf ball-sized hail fell about 4 miles east northeast of Stockton, IL around 604 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:04:00 to 24-JUL-09 17:06:00 (CST-6)
Location: STOCKTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball-sized hail fell for a few minutes in Stockton, IL around 605 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:07:00 to 24-JUL-09 17:07:00 (CST-6)
Location: STOCKTON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail up to 2 inches in diameter fell in Stockton, IL around 607 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 16:35:00 to 24-JUL-09 16:35:00 (CST-6)
Location: SCALES MOUND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golf ball-sized hail fell in Scales Mound, IL around 535 pm July 24.

Hail in JO DAVIESS, ILLINOIS
From 24-JUL-09 16:38:00 to 24-JUL-09 16:38:00 (CST-6)
Location: SCALES MOUND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Golf ball-sized hail fell 2 miles east of Scales Mound, IL around 538 pm July 24.

Hail in STEPHENSON, ILLINOIS
From 24-JUL-09 17:02:00 to 24-JUL-09 17:02:00 (CST-6)
Location: KENT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail 2 inches in diameter fell about 5 miles west southwest of Lena, IL around 602 pm July 24.

Thunderstorm Wind in BUREAU, ILLINOIS
From 24-JUL-09 20:50:00 to 24-JUL-09 21:00:00 (CST-6)
Location: PRINCETON
Magnitude: 74.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 85 mph caused widespread wind damage across the central and southern parts of Princeton, IL between 950 pm and 1000 pm July 24.  Several trees were blown down or uprooted.  An outdoor stage was destroyed.  A section of roof of a funeral home was ripped off.  Several telephone poles were broken south of town.  About 3 or 4 buildings were destroyed about 1/4 mile south of town.

Thunderstorm Wind in HENRY, ILLINOIS
From 24-JUL-09 20:50:00 to 24-JUL-09 20:50:00 (CST-6)
Location: KEWANEE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Wind gusts estimated to be 70 mph blew down several 8 to 10 inch diameter trees across the western parts of Kewanee, IL around 950 pm July 24.  Some of the fallen trees blocked some city streets.

Thunderstorm Wind in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:55:00 to 24-JUL-09 17:55:00 (CST-6)
Location: GALENA
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 70 mph blew a semi truck over onto a car on Highway 20 near Mount Hope Road about 1 mile east of Galena, IL around 655 pm July 24.  One person was injured.  In addition, several trees were blown down in the area.

Thunderstorm Wind in JO DAVIESS, ILLINOIS
From 24-JUL-09 17:50:00 to 24-JUL-09 17:50:00 (CST-6)
Location: GUILFORD
Magnitude: 61.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 70 mph blew down several trees in the vicinity of the Galena Territory just east of Galena, IL around 650 pm July 24.  One tree fell onto a house in the Galena Territory area.