An outflow boundary from convection in Minnesota combined with an upper level disturbance, a weak low level jet, a semi-moist atmosphere, and a warm front running from central Iowa to central Illinois to produce a severe mesoscale convective system across eastern Iowa and northern Illinois.  Numerous measuring equipment at airports and spotters reported winds of 43 to 49 knots (50 to 56 mph) associated with the gust front.  Numerous trees were downed and sections of corn fields were laid flat by gusts associated with the storms that exceeded 52 knots (60 mph).  Due to high freezing levels in the atmosphere, very little hail was reported.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 19-JUL-06 13:10:00 to 19-JUL-06 13:10:00 (CST)
Location: MORRISON
Magnitude: 57 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Also from co-op observer.  Trees and power lines down.  Many of the limbs were 6 inches in diameter with some greater than 10 inches in diameter.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 19-JUL-06 12:55:00 to 19-JUL-06 12:55:00 (CST)
Location: MOLINE
Magnitude: 52 EG
Property damage: 2K
Reported by: NEWSPAPER

large limbs down.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 19-JUL-06 13:05:00 to 19-JUL-06 13:05:00 (CST)
Location: EAST MOLINE
Magnitude: 57 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

trees down

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 19-JUL-06 13:10:00 to 19-JUL-06 13:10:00 (CST)
Location: CARBON CLIFF
Magnitude: 52 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

numerous branches under 1 inch in diameter down.  A few 5 inch diameter limbs down.

Thunderstorm Wind in HENRY, ILLINOIS
From 19-JUL-06 13:35:00 to 19-JUL-06 13:35:00 (CST)
Location: NEKOMA
Magnitude: 52 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

4 to 5 inch diameter limbs down.

Thunderstorm Wind in BUREAU, ILLINOIS
From 19-JUL-06 13:37:00 to 19-JUL-06 13:37:00 (CST)
Location: SHEFFIELD
Magnitude: 57 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

numerous trees of 12 inches in diameter and more down.  Many limbs of 6 inches or more in diameter down.  Power lines down.

Thunderstorm Wind in BUREAU, ILLINOIS
From 19-JUL-06 13:51:00 to 19-JUL-06 14:00:00 (CST)
Location: WALNUT
Magnitude: 57 EG
Property damage: 2K
Reported by: OFFICIAL NWS OBS.

From cooperative observer.  Many big branches up to 6 inches in diameter down around village.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 19-JUL-06 12:35:00 to 19-JUL-06 12:45:00 (CST)
Location: ALBANY
Magnitude: 57 EG
Property damage: 4K
Reported by: NEWSPAPER

Trees down.  Time is estimated based on radar.

Thunderstorm Wind in BUREAU, ILLINOIS
From 19-JUL-06 13:56:00 to 19-JUL-06 14:00:00 (CST)
Location: PRINCETON
Magnitude: 57 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Numerous limbs 6 inches in diameter down across city.  Several trees down with power lines down.

Thunderstorm Wind in BUREAU, ILLINOIS
From 19-JUL-06 14:15:00 to 19-JUL-06 14:15:00 (CST)
Location: DOVER
Magnitude: 57 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

Trees down in town.  Time estimated based on radar.

Thunderstorm Wind in PUTNAM, ILLINOIS
From 19-JUL-06 15:00:00 to 19-JUL-06 15:00:00 (CST)
Location: STANDARD
Magnitude: 52 EG
Property damage: .5K
Reported by: TRAINED SPOTTER

3 to 4 inch diameter limbs down

Thunderstorm Wind in PUTNAM, ILLINOIS
From 19-JUL-06 14:24:00 to 19-JUL-06 14:34:00 (CST)
Location: HENNEPIN
Magnitude: 57 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Tree down on car.  Time estimated based on radar.

Thunderstorm Wind in PUTNAM, ILLINOIS
From 19-JUL-06 14:29:00 to 19-JUL-06 14:29:00 (CST)
Location: GRANVILLE
Magnitude: 57 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

6 inch diameter tree down

Heavy Rain in PUTNAM, ILLINOIS
From 19-JUL-06 15:00:00 to 19-JUL-06 15:00:00 (CST)
Location: STANDARD
Reported by: TRAINED SPOTTER

Hail in MCDONOUGH, ILLINOIS
From 19-JUL-06 15:05:00 to 19-JUL-06 15:05:00 (CST)
Location: PRAIRIE CITY
Magnitude: 0.88 
Reported by: FIRE DEPT/RESCUE SQUAD

nickel size hail

Thunderstorm Wind in PUTNAM, ILLINOIS
From 19-JUL-06 15:07:00 to 19-JUL-06 15:07:00 (CST)
Location: MC NABB
Magnitude: 52 EG
Property damage: .5K
Crop damage: 1K
Reported by: TRAINED SPOTTER

4 inch diameter limbs down on Meridian Rd along the Putnam/La Salle line.

Hail in MCDONOUGH, ILLINOIS
From 19-JUL-06 15:30:00 to 19-JUL-06 15:30:00 (CST)
Location: BLANDINSVILLE
Magnitude: 0.88 
Crop damage: 2K
Reported by: GENERAL PUBLIC

lots of nickel hail on the ground.

Thunderstorm Wind in HENRY, ILLINOIS
From 19-JUL-06 13:15:00 to 19-JUL-06 13:15:00 (CST)
Location: CAMBRIDGE
Magnitude: 57 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

5 inch diameter tree split down the middle.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 19-JUL-06 12:40:00 to 19-JUL-06 12:46:00 (CST)
Location: ALBANY
Magnitude: 57 EG
Property damage: 2K
Reported by: NEWSPAPER

Trees down on Ebson Rd north of the turnoff for Garden Plain Rd. Time is estimated based on radar.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 19-JUL-06 12:40:00 to 19-JUL-06 12:50:00 (CST)
Location: FULTON
Magnitude: 57 EG
Property damage: 10K
Reported by: NEWSPAPER

Trees down with the facade to several buildings damaged.  Time is estimated based on radar.

Thunderstorm Wind in CARROLL, ILLINOIS
From 19-JUL-06 12:40:00 to 19-JUL-06 12:50:00 (CST)
Location: SAVANNA
Magnitude: 52 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

5 inch diameter limbs down.  A spotter several miles away measured a gust of 43 knots (49 mph).