A strong cold front pushed into a very warm unstable air mass as a significant upper level storm system tracked into the northern Great Lakes on June 29-30, 2014. A major severe weather and flash flood event unfolded across the area. This event resulted in the direct deaths of 2 people and direct injuries to 7 others. Three weak tornadoes, widespread damaging winds of 60 to 80 mph, and life-threatening flash flooding due to 4 to 6 inches of rainfall was reported. Two of the tornadoes were in northeast Iowa while another tornado was spotted in northwest Illinois. Law enforcement reported a business building destroyed by high winds from a severe thunderstorm in Fairfax, Iowa. One person was killed and another injured due to the collapsed structure. A severe thunderstorm packing 80 mph winds blew a tarp on top of several people trying to cover the infield at Veterans Memorial Stadium in Cedar Rapids, Iowa. Three people suffered concussions while another person had a dislocated shoulder. In North Liberty, Iowa a tree fell on a person who was then transported to a local hospital. Severe flash flooding in Cedar Rapids, Iowa resulted in the drowning death of a teenage boy with another boy injured. They were swept into a storm sewer and were found a mile away in a lake.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 21:15:00 to 30-JUN-14 21:15:00 (CST-6)
Location: COLCHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported small tree limbs down.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 29-JUN-14 23:14:00 to 29-JUN-14 23:14:00 (CST-6)
Location: FULTON
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind measurement taken using a Davis weather equipment that was mounted on a ham radio tower at 40 feet above the ground.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 20:38:00 to 30-JUN-14 20:38:00 (CST-6)
Location: GOOD HOPE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 58 mph winds.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 30-JUN-14 20:52:00 to 30-JUN-14 20:52:00 (CST-6)
Location: CARTHAGE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 60 mph winds.

Thunderstorm Wind in CARROLL, ILLINOIS
From 29-JUN-14 23:45:00 to 29-JUN-14 23:45:00 (CST-6)
Location: THOMSON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported dozens of trees down, power poles snapped off, semi-truck flipped and a motor home tipped.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 29-JUN-14 23:45:00 to 29-JUN-14 23:45:00 (CST-6)
Location: MORRISON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated wind gusts to 60 mph.

Thunderstorm Wind in CARROLL, ILLINOIS
From 29-JUN-14 23:59:00 to 29-JUN-14 23:59:00 (CST-6)
Location: MILLEDGEVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported 60 mph winds.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 20:25:00 to 30-JUN-14 20:25:00 (CST-6)
Location: BLANDINSVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated 60 mph winds.

Thunderstorm Wind in CARROLL, ILLINOIS
From 30-JUN-14 00:00:00 to 30-JUN-14 00:00:00 (CST-6)
Location: THOMSON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported a barn blown down along with outbuildings and a garage damaged. Corn fields were also flattened.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 20:32:00 to 30-JUN-14 20:32:00 (CST-6)
Location: SCIOTA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The fire department reported 65 mph winds with tree damage in the area.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 30-JUN-14 00:00:00 to 30-JUN-14 00:00:00 (CST-6)
Location: COLETA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 6 tree limbs down that were 4 to 5 inches in diameter.

Thunderstorm Wind in BUREAU, ILLINOIS
From 30-JUN-14 16:32:00 to 30-JUN-14 16:32:00 (CST-6)
Location: BUDA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager observed a tree down on a house.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 21:15:00 to 30-JUN-14 21:15:00 (CST-6)
Location: COLCHESTER
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated 58 mph winds.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 29-JUN-14 23:45:00 to 29-JUN-14 23:45:00 (CST-6)
Location: FULTON
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown down throughout town and minor structural damage occurred to several buildings.  Also, a dumpster was blown away.

Thunderstorm Wind in BUREAU, ILLINOIS
From 30-JUN-14 16:52:00 to 30-JUN-14 16:52:00 (CST-6)
Location: PRINCETON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported a tree down in town blocking a lane.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 30-JUN-14 19:51:00 to 30-JUN-14 19:51:00 (CST-6)
Location: GERMAN VLY
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down on Bunkerhill and Church Roads in the German Valley area.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 30-JUN-14 19:55:00 to 30-JUN-14 19:55:00 (CST-6)
Location: DAMASCUS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a tree down on Flansburg Road between Cook and Wagner Road.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 30-JUN-14 20:25:00 to 30-JUN-14 20:25:00 (CST-6)
Location: BLANDINSVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported corn flattened.