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 JACKSON, IOWA
From 19-JUL-06 12:15:00 to 19-JUL-06 12:15:00 (CST)
Location: MAQUOKETA
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

trees and power lines down

Thunderstorm Wind in CLINTON, IOWA
From 19-JUL-06 12:29:00 to 19-JUL-06 12:29:00 (CST)
Location: DELMAR
Magnitude: 52 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

trees and power lines down

Thunderstorm Wind in CEDAR, IOWA
From 19-JUL-06 12:15:00 to 19-JUL-06 12:15:00 (CST)
Location: LOWDEN
Magnitude: 52 EG
Property damage: .1K
Crop damage: 2K
Reported by: TRAINED SPOTTER

2 to 3 inch diameter branches down

Thunderstorm Wind in SCOTT, IOWA
From 19-JUL-06 12:29:00 to 19-JUL-06 12:29:00 (CST)
Location: PARKVIEW
Magnitude: 52 EG
Property damage: .5K
Reported by: TRAINED SPOTTER

4 inch diameter limbs down

Thunderstorm Wind in CLINTON, IOWA
From 19-JUL-06 12:47:00 to 19-JUL-06 12:47:00 (CST)
Location: CALAMUS
Magnitude: 52 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

trees and power lines down

Thunderstorm Wind in CLINTON, IOWA
From 19-JUL-06 12:33:00 to 19-JUL-06 12:33:00 (CST)
Location: CLINTON
Magnitude: 61 EG
Property damage: 20K
Reported by: TRAINED SPOTTER

several 12 to 15 inch diameter limbs down with several trees either topped or downed.  The smokestacks from the Clinton Showboat Theater were blown off.

Heavy Rain in CLINTON, IOWA
From 19-JUL-06 12:30:00 to 19-JUL-06 13:00:00 (CST)
Location: CLINTON
Reported by: TRAINED SPOTTER

1.5 inches of rain

Thunderstorm Wind in CLINTON, IOWA
From 19-JUL-06 12:33:00 to 19-JUL-06 12:39:00 (CST)
Location: CAMANCHE
Magnitude: 52 EG
Reported by: OFFICIAL NWS OBS.

co-op observer reports estimated 52 knot (60 mph winds)

Thunderstorm Wind in SCOTT, IOWA
From 19-JUL-06 12:45:00 to 19-JUL-06 12:45:00 (CST)
Location: DAVENPORT
Magnitude: 52 EG
Property damage: 4K
Reported by: LAW ENFORCEMENT

trees and power lines down near Northwest Blvd.

Lightning in DELAWARE, IOWA
From 19-JUL-06 10:45:00 to 19-JUL-06 11:15:00 (CST)
Location: MANCHESTER
Property damage: 10K
Reported by: NEWSPAPER

Some time between 1045 and 1115 CST lightning struck one of the West Delaware School District buildings and destroyed the phone system.

Thunderstorm Wind in DELAWARE, IOWA
From 19-JUL-06 10:58:00 to 19-JUL-06 11:04:00 (CST)
Location: MANCHESTER
Magnitude: 52 EG
Property damage: 2K
Reported by: EMERGENCY MANAGER

Civil Defense reported many 1 to 1.5 inch diameter branches down with a few 4 inch diameter branches down.

Thunderstorm Wind in DELAWARE, IOWA
From 19-JUL-06 10:58:00 to 19-JUL-06 11:25:00 (CST)
Location: COUNTYWIDE
Magnitude: 57 EG
Crop damage: 10K
Reported by: OTHER FEDERAL AGENCY

Thunderstorm winds flattened considerable amounts of corn in fields across the south third of the county.  Some of the worst flattening was to the south and east of Ryan according to newspaper reports.

Heavy Rain in JONES, IOWA
From 19-JUL-06 11:30:00 to 19-JUL-06 12:10:00 (CST)
Location: ANAMOSA
Reported by: TRAINED SPOTTER

1.6 inches of rain in 40 minutes

Thunderstorm Wind in DUBUQUE, IOWA
From 19-JUL-06 11:36:00 to 19-JUL-06 11:42:00 (CST)
Location: CASCADE
Magnitude: 52 EG
Property damage: 1K
Reported by: NEWSPAPER

very large tree down

Thunderstorm Wind in JONES, IOWA
From 19-JUL-06 11:38:00 to 19-JUL-06 11:47:00 (CST)
Location: OLIN
Magnitude: 57 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

18 inch diameter tree limbs down

Heavy Rain in BUCHANAN, IOWA
From 19-JUL-06 10:10:00 to 19-JUL-06 11:00:00 (CST)
Location: AURORA
Reported by: TRAINED SPOTTER

estimated 2 inches of rain in 45 minutes; 4 inches of standing water in a parking lot.

Thunderstorm Wind in JONES, IOWA
From 19-JUL-06 11:23:00 to 19-JUL-06 11:23:00 (CST)
Location: MONTICELLO
Magnitude: 57 EG
Property damage: 25K
Reported by: EMERGENCY MANAGER

Numerous trees down with one on a mobile home that temporarily trapped a woman inside.  The woman was not injured.

Thunderstorm Wind in JONES, IOWA
From 19-JUL-06 11:45:00 to 19-JUL-06 11:45:00 (CST)
Location: ANAMOSA
Magnitude: 61 EG
Property damage: 10K
Crop damage: 15K
Reported by: NEWSPAPER

Numerous corn fields were flattened to the north and east of Anamosa by the wind with several trees down.  A silo was destroyed 4.4 miles east southeast of Anamosa.  Time is estimated based on radar.

Thunderstorm Wind in JONES, IOWA
From 19-JUL-06 11:27:00 to 19-JUL-06 11:35:00 (CST)
Location: MARTELLE
Magnitude: 52 EG
Crop damage: 5K
Reported by: TRAINED SPOTTER

Spotter reports estimated 60 mph winds.  The emergency manager in Anamosa reported a measured 49 knot (56 mph) wind gust.

Thunderstorm Wind in CEDAR, IOWA
From 19-JUL-06 12:10:00 to 19-JUL-06 12:10:00 (CST)
Location: LOWDEN
Magnitude: 57 EG
Property damage: 2K
Crop damage: 10K
Reported by: OFFICIAL NWS OBS.

Co-op observer reports three farms had tree and crop damage.  Corn was flattened with trees downed or topped off.

Hail in JONES, IOWA
From 19-JUL-06 11:50:00 to 19-JUL-06 11:50:00 (CST)
Location: OLIN
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

dime size hail