Strong to severe thunderstorms moved across parts of northern Illinois during the evening hours of June 21st.  Additional storms developed during the morning hours of June 21st as well as the early morning hours of June 22nd.

Thunderstorm Wind in COOK, ILLINOIS
From 21-JUN-10 21:48:00 to 21-JUN-10 21:48:00 (CST-6)
Location: (ORD)O'HARE INTL ARP
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in LAKE, ILLINOIS
From 21-JUN-10 21:56:00 to 21-JUN-10 21:56:00 (CST-6)
Location: WAUKEGAN MEM ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in LAKE, ILLINOIS
From 21-JUN-10 21:40:00 to 21-JUN-10 21:40:00 (CST-6)
Location: LOON LAKE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was blown down on Petite Lake Road.

Thunderstorm Wind in FORD, ILLINOIS
From 21-JUN-10 23:05:00 to 21-JUN-10 23:15:00 (CST-6)
Location: GIBSON CITY
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were blown down blocking Route 9 between Gibson City and Paxton.

Thunderstorm Wind in COOK, ILLINOIS
From 21-JUN-10 22:30:00 to 21-JUN-10 22:30:00 (CST-6)
Location: HANSON PARK
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

A tree was blown down across Harlem Avenue at Division.

Thunderstorm Wind in IROQUOIS, ILLINOIS
From 21-JUN-10 16:45:00 to 21-JUN-10 16:45:00 (CST-6)
Location: CISSNA PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Large tree limbs were blown down, one fell on restrooms at a park.

Thunderstorm Wind in WINNEBAGO, ILLINOIS
From 21-JUN-10 19:33:00 to 21-JUN-10 19:33:00 (CST-6)
Location: PECATONICA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A few trees were blown down.

Hail in KENDALL, ILLINOIS
From 21-JUN-10 21:05:00 to 21-JUN-10 21:06:00 (CST-6)
Location: PLATTVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter size hail was reported near Ridge Road and Theodore Street.

Thunderstorm Wind in MCHENRY, ILLINOIS
From 21-JUN-10 09:30:00 to 21-JUN-10 09:30:00 (CST-6)
Location: LAKEMOOR
Magnitude: 52.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs were blown down.  A roof vent and shingles were also damaged.

Tornado in IROQUOIS, ILLINOIS
From 21-JUN-10 17:24:00 to 21-JUN-10 17:25:00 (CST-6)
Location: CISSNA PARK
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter observed a rain-wrapped tornado in a field. There was no damage.

Thunderstorm Wind in FORD, ILLINOIS
From 21-JUN-10 23:00:00 to 21-JUN-10 23:05:00 (CST-6)
Location: GIBSON CITY
Magnitude: 65.00 EG
Property damage: 750.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees up to two feet in diameter, tree limbs and power lines were blown down in Gibson City.  Some trees and tree limbs fell onto houses.  A semi tanker trailer was pushed over on its side.  A large grain bin under construction was knocked off its foundation.  Damage to the grain bin itself was estimated at $750,000.

Thunderstorm Wind in BOONE, ILLINOIS
From 21-JUN-10 20:25:00 to 21-JUN-10 20:25:00 (CST-6)
Location: POPLAR GROVE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A medium size tree limb was blown down on Route 173.

Thunderstorm Wind in KENDALL, ILLINOIS
From 21-JUN-10 21:02:00 to 21-JUN-10 21:02:00 (CST-6)
Location: PLATTVILLE
Magnitude: 50.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large silo blew down onto an anhydrous ammonia tank, damaging a valve. The ammonia leak resulted in evacuation of several nearby residences. There was also a tree blown down on a road.

Tornado in FORD, ILLINOIS
From 21-JUN-10 15:58:00 to 21-JUN-10 16:01:00 (CST-6)
Location: MELVIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter witnessed a brief tornado with a debris cloud in an open field near U.S. 52, southwest of Melvin.

Thunderstorm Wind in IROQUOIS, ILLINOIS
From 21-JUN-10 23:15:00 to 21-JUN-10 23:15:00 (CST-6)
Location: CISSNA PARK
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Newspaper

A power pole was blown down across Route 49.

Thunderstorm Wind in COOK, ILLINOIS
From 21-JUN-10 22:30:00 to 21-JUN-10 22:30:00 (CST-6)
Location: OAK PARK
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Newspaper

Several tree limbs and power lines were blown down.

Thunderstorm Wind in COOK, ILLINOIS
From 21-JUN-10 22:22:00 to 21-JUN-10 22:22:00 (CST-6)
Location: CHICAGO
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree limbs were blown down with damage to two cars.

Flash Flood in FORD, ILLINOIS
From 21-JUN-10 19:05:00 to 21-JUN-10 23:00:00 (CST-6)
Location: MELVIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Roads were closed due to water from nearby fields flowing across them.