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 LINN, IOWA
From 30-JUN-14 13:55:00 to 30-JUN-14 13:55:00 (CST-6)
Location: MARION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous 3 to 15 foot long branches down and 2 maple trees about 20 feet tall snapped off at the base.

Thunderstorm Wind in JACKSON, IOWA
From 30-JUN-14 14:30:00 to 30-JUN-14 14:30:00 (CST-6)
Location: BALDWIN
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported that a building collapsed onto two campers about 3 miles north of Baldwin.

Thunderstorm Wind in IOWA, IOWA
From 30-JUN-14 13:30:00 to 30-JUN-14 13:30:00 (CST-6)
Location: MARENGO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 60 mph brought limbs down.

Thunderstorm Wind in IOWA, IOWA
From 30-JUN-14 13:30:00 to 30-JUN-14 13:30:00 (CST-6)
Location: MARENGO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated winds of 60 to 70 mph.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:53:00 to 30-JUN-14 13:53:00 (CST-6)
Location: MARION
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported outbuildings damaged and a roof blown off a house.

Thunderstorm Wind in SCOTT, IOWA
From 30-JUN-14 14:48:00 to 30-JUN-14 14:48:00 (CST-6)
Location: WALCOTT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A former NWS employee estimated 60 mph winds.

Thunderstorm Wind in CLINTON, IOWA
From 30-JUN-14 14:40:00 to 30-JUN-14 14:40:00 (CST-6)
Location: DELMAR
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement observed a semi-truck overturned.

Thunderstorm Wind in DUBUQUE, IOWA
From 30-JUN-14 14:48:00 to 30-JUN-14 14:48:00 (CST-6)
Location: CENTER GROVE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported trees down at the Dubuque county fairgrounds.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:35:00 to 30-JUN-14 13:35:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP observer reported 70 mph winds that blew down trees and power lines. Corn was also flattened from Independence to Hazelton. A semi-truck jackknifed on Highway 151 north of Independence.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:55:00 to 30-JUN-14 13:55:00 (CST-6)
Location: MARION
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 LINN, IOWA
From 30-JUN-14 14:03:00 to 30-JUN-14 14:03:00 (CST-6)
Location: VIOLA
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds were measured at 65 mph.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 14:05:00 to 30-JUN-14 14:05:00 (CST-6)
Location: MARION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large tree branches down near Alburnett.

Thunderstorm Wind in JOHNSON, IOWA
From 30-JUN-14 13:56:00 to 30-JUN-14 13:56:00 (CST-6)
Location: NORTH LIBERTY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 5 inch diameter trees snapped.

Thunderstorm Wind in DELAWARE, IOWA
From 30-JUN-14 14:06:00 to 30-JUN-14 14:06:00 (CST-6)
Location: MANCHESTER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported numerous trees down.

Thunderstorm Wind in JOHNSON, IOWA
From 30-JUN-14 14:00:00 to 30-JUN-14 14:00:00 (CST-6)
Location: IOWA CITY
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported trees down in Iowa City.

Thunderstorm Wind in JONES, IOWA
From 29-JUN-14 21:00:00 to 29-JUN-14 21:00:00 (CST-6)
Location: LANGWORTHY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported a large barn blown down and a wagon moved 100 feet and tipped over.  There was also damage to three other barns on the farm.

Thunderstorm Wind in JONES, IOWA
From 29-JUN-14 21:49:00 to 29-JUN-14 21:49:00 (CST-6)
Location: WYOMING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The fire department estimated winds of 60 mph.

Thunderstorm Wind in DES MOINES, IOWA
From 30-JUN-14 19:40:00 to 30-JUN-14 19:40:00 (CST-6)
Location: LENOX PARK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported tree limbs and power lines down.

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

A trained spotter reported a 20 inch diameter tree snapped.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:43:00 to 30-JUN-14 13:43:00 (CST-6)
Location: (CID)CEDAR RAPIDS AR
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Measured at the ASOS station.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:49:00 to 30-JUN-14 13:49:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated at least 80 mph winds for over 5 minutes.

Thunderstorm Wind in JACKSON, IOWA
From 30-JUN-14 14:49:00 to 30-JUN-14 14:49:00 (CST-6)
Location: ANDREW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a shed blown over and tree branches down.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:53:00 to 30-JUN-14 13:53:00 (CST-6)
Location: MARION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated 60 mph wind gusts at Christ Community United Methodist Church.

Thunderstorm Wind in JACKSON, IOWA
From 29-JUN-14 22:20:00 to 29-JUN-14 22:20:00 (CST-6)
Location: BUCKHORN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP observer reported corn flattened and trees down near Highway 61.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:37:00 to 30-JUN-14 13:37:00 (CST-6)
Location: INDEPENDENCE
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 CLINTON, IOWA
From 29-JUN-14 23:35:00 to 29-JUN-14 23:35:00 (CST-6)
Location: CLINTON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported numerous large trees down, some on homes, and power lines also down.  The damage occurred mainly in the central portion of the city of Clinton.  The winds were estimated at 70 to 80 mph.

Thunderstorm Wind in BUCHANAN, IOWA
From 29-JUN-14 20:05:00 to 29-JUN-14 20:05:00 (CST-6)
Location: JESUP
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large tree was blown down on a neighbors property.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:49:00 to 30-JUN-14 13:49:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and power line down across the city of Cedar Rapids.

Thunderstorm Wind in JONES, IOWA
From 30-JUN-14 14:10:00 to 30-JUN-14 14:10:00 (CST-6)
Location: AMBER
Magnitude: 62.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 2 foot diameter tree down and estimated winds of 60 to 70 mph.

Thunderstorm Wind in BENTON, IOWA
From 30-JUN-14 13:23:00 to 30-JUN-14 13:23:00 (CST-6)
Location: BELLE PLAINE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2 large trees down, one fell on a house and one on a garage.

Hail in JONES, IOWA
From 29-JUN-14 21:04:00 to 29-JUN-14 21:04:00 (CST-6)
Location: ANAMOSA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported hail the size of quarters in the city of Anamosa.

Thunderstorm Wind in DUBUQUE, IOWA
From 30-JUN-14 14:45:00 to 30-JUN-14 14:45:00 (CST-6)
Location: BERNARD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported 4 trailers damaged for destroyed along with widespread tree damage. There was a 100 yard wide and 3/4 mile long path with
50-70 percent of trees blown down or snapped off.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:55:00 to 30-JUN-14 13:55:00 (CST-6)
Location: WHITTIER
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported trees uprooted and outbuildings blown down.

Thunderstorm Wind in BENTON, IOWA
From 30-JUN-14 13:23:00 to 30-JUN-14 13:23:00 (CST-6)
Location: BELLE PLAINE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated winds of 60 to 65 mph.

Thunderstorm Wind in BENTON, IOWA
From 30-JUN-14 13:23:00 to 30-JUN-14 13:23:00 (CST-6)
Location: GARRISON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported widespread damage in Garrison.  Winds were estimated at 70 mph.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 14:00:00 to 30-JUN-14 14:00:00 (CST-6)
Location: MARION
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 60 mph winds near Lindale Mall in Cedar Rapids.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:55:00 to 30-JUN-14 13:55:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter estimated 70 mph winds that brought down two trees at the Cedar Memorial Cemetary.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:49:00 to 30-JUN-14 13:49:00 (CST-6)
Location: ROBINS
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

In Robins a 40 foot oak tree was uprooted and many tree branches down. On the north side of town numerous trees snapped off about 3 feet above the ground.

Thunderstorm Wind in IOWA, IOWA
From 29-JUN-14 22:00:00 to 29-JUN-14 22:00:00 (CST-6)
Location: GENOA BLUFF
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager estimated winds at 60 mph that brought down small tree limbs.

Thunderstorm Wind in JACKSON, IOWA
From 29-JUN-14 22:17:00 to 29-JUN-14 22:17:00 (CST-6)
Location: BALDWIN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported windows blown out of a home along Highway 64 and 82nd street.

Thunderstorm Wind in JONES, IOWA
From 30-JUN-14 14:09:00 to 30-JUN-14 14:09:00 (CST-6)
Location: ANAMOSA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Large trees down throughout the city of Anamosa.

Thunderstorm Wind in JONES, IOWA
From 30-JUN-14 14:09:00 to 30-JUN-14 14:09:00 (CST-6)
Location: FAIRVIEW
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP observer reported trees down and no power.

Thunderstorm Wind in JACKSON, IOWA
From 30-JUN-14 14:38:00 to 30-JUN-14 14:38:00 (CST-6)
Location: OTTER CREEK
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported a garage and machine shed destroyed and two power poles snapped.  The damage was along Bellevue-Cascade Road just west of Highway 61.

Thunderstorm Wind in JACKSON, IOWA
From 30-JUN-14 14:42:00 to 30-JUN-14 14:42:00 (CST-6)
Location: MAQUOKETA
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured 62 mph winds.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:55:00 to 30-JUN-14 13:55:00 (CST-6)
Location: MARION
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree branches down heading toward Alburnett.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:42:00 to 30-JUN-14 13:42:00 (CST-6)
Location: FAIRFAX
Magnitude: 72.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a business building destroyed by high winds from a severe thunderstorm.  One person was killed and another injured due to the collapsed structure.  A NWS survey found the roof had been blown off which caused the walls to collapse inward and the body was found underneath the rubble.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:37:00 to 30-JUN-14 13:37:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 60 mph winds.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:50:00 to 30-JUN-14 13:50:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported tree branches damaged a vehicle.

Thunderstorm Wind in JOHNSON, IOWA
From 30-JUN-14 14:10:00 to 30-JUN-14 14:10:00 (CST-6)
Location: IOWA CITY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

An amateur radio operator reported tree limbs down near Weber School.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 14:00:00 to 30-JUN-14 14:00:00 (CST-6)
Location: PALO
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported trees down and roofs blown off homes from Palo to Toddville.  Winds were estimated over 80 mph.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:34:00 to 30-JUN-14 13:34:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a large tree down on a house.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:36:00 to 30-JUN-14 13:36:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 62.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous trees down  and no power in Independence.

Thunderstorm Wind in IOWA, IOWA
From 30-JUN-14 13:40:00 to 30-JUN-14 13:40:00 (CST-6)
Location: HOMESTEAD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a hoop building blown away and major tree damage.  A steel farm shed was also flattened on a neighboring farm.

Thunderstorm Wind in DUBUQUE, IOWA
From 30-JUN-14 14:45:00 to 30-JUN-14 14:45:00 (CST-6)
Location: BERNARD
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager estimated 80 to 90 mph winds that caused widespread damage in town.

Thunderstorm Wind in BUCHANAN, IOWA
From 30-JUN-14 13:40:00 to 30-JUN-14 13:40:00 (CST-6)
Location: HAZLETON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP observer estimated winds of 60 mph.

Thunderstorm Wind in CEDAR, IOWA
From 30-JUN-14 14:26:00 to 30-JUN-14 14:26:00 (CST-6)
Location: TIPTON
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured 65 mph winds.

Thunderstorm Wind in JACKSON, IOWA
From 30-JUN-14 14:42:00 to 30-JUN-14 14:42:00 (CST-6)
Location: MAQUOKETA
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Measured 60 mph winds.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 14:00:00 to 30-JUN-14 14:00:00 (CST-6)
Location: PRAIRIEBURG
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winds measured by a trained spotter.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:49:00 to 30-JUN-14 13:49:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported significant tree damage with numerous limbs down.

Thunderstorm Wind in JOHNSON, IOWA
From 30-JUN-14 13:57:00 to 30-JUN-14 13:57:00 (CST-6)
Location: NORTH LIBERTY
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported a tree fell on a person in North Liberty, and was transported to the hospital.

Thunderstorm Wind in BENTON, IOWA
From 30-JUN-14 13:23:00 to 30-JUN-14 13:23:00 (CST-6)
Location: GARRISON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported widespread wind damage across western Benton county.

Thunderstorm Wind in LINN, IOWA
From 30-JUN-14 13:50:00 to 30-JUN-14 13:50:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 72.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

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. This occurred toward the end of the Cedar Rapids Kernels minor league baseball game. Three people suffered concussions while another person dislocated his shoulder.

Hail in JONES, IOWA
From 29-JUN-14 21:10:00 to 29-JUN-14 21:10:00 (CST-6)
Location: AMBER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported hail the size of quarters.