An upper level storm system moved across the high Plains during the afternoon on Tuesday June 3rd, and then across the mid Missouri River Valley on Tuesday night. Ahead of the system, warm, moist and unstable air was pulled north as a warm front lifted into eastern Nebraska and southwest Iowa by mid afternoon. The combination of the strong vertical wind shear near the boundary, and the strong instability created a volatile atmosphere across the area. The first of several rounds of supercell thunderstorms moved into northeast Nebraska after 1 pm and tracked east southeast. This intense storm moved across northeast Nebraska, and into western and finally southern Iowa producing severe weather. Additional thunderstorms developed ahead and behind this initial wave, also producing severe weather. Additional supercells developed in central Nebraska and moved into southeast Nebraska during the evening hours. The severe weather ended after midnight across the area. Due to the repeated tracking of thunderstorms across the same area, flash flooding was observed in several areas which eventually led to river flooding as well.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 15:55:00 to 03-JUN-14 15:55:00 (CST-6)
Location: CHAUTAUQUA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Measured at the Council Bluffs Airport.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 17:35:00 to 03-JUN-14 17:35:00 (CST-6)
Location: CHAUTAUQUA
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Measured at the Council Bluffs Airport.

Thunderstorm Wind in MONTGOMERY, IOWA
From 03-JUN-14 16:22:00 to 03-JUN-14 16:22:00 (CST-6)
Location: WALES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A telephone pole was downed 4 miles east of Glenwood along highway 320.

Hail in HARRISON, IOWA
From 03-JUN-14 15:32:00 to 03-JUN-14 15:32:00 (CST-6)
Location: MISSOURI VLY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MILLS, IOWA
From 03-JUN-14 18:15:00 to 03-JUN-14 18:15:00 (CST-6)
Location: HASTINGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree was blown down and damaged a house.

Thunderstorm Wind in MONTGOMERY, IOWA
From 03-JUN-14 18:32:00 to 03-JUN-14 18:32:00 (CST-6)
Location: RED OAK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported several trees downed in the city of Red Oak.

Thunderstorm Wind in HARRISON, IOWA
From 03-JUN-14 15:25:00 to 03-JUN-14 15:25:00 (CST-6)
Location: MISSOURI VLY
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Strong winds associated with an intense supercell lifted the roof off two hotels at the intersection of Interstate 29 and highway 30. The winds also downed trees and propelled the hail through siding on houses, destroyed crops and debarked trees.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 15:38:00 to 03-JUN-14 15:38:00 (CST-6)
Location: CRESCENT
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts to near 80 mph were estimated by a spotter.

Flood in MILLS, IOWA
From 03-JUN-14 20:23:00 to 04-JUN-14 11:22:00 (CST-6)
Location: PACIFIC JCT
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Minor flooding was observed along Keg Creek near Glenwood due to heavy rain.  The creek reached nearly 31 feet during the morning of June 4, flood stage is 29 feet.  The flooding mainly impacted farmland along the creek.

Thunderstorm Wind in PAGE, IOWA
From 03-JUN-14 19:43:00 to 03-JUN-14 19:43:00 (CST-6)
Location: ESSEX ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported that a well constructed farm building was blown 300 feet into a field.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 15:35:00 to 03-JUN-14 15:35:00 (CST-6)
Location: UNDERWOOD
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported structural damage, as well as tree and power line damage.

Thunderstorm Wind in PAGE, IOWA
From 03-JUN-14 19:50:00 to 03-JUN-14 19:50:00 (CST-6)
Location: SHENANDOAH
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Flood in FREMONT, IOWA
From 04-JUN-14 00:00:00 to 05-JUN-14 08:45:00 (CST-6)
Location: RANDOLPH
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain caused the West Nishnabotna River to flood from near Randolph downstream to near Riverton.  The river near Randolph reached nearly 22.5 feet during the morning of June 4th, flood stage is 19 feet.  Meanwhile, the river crested at around 26.36 feet near Riverton around noon on June 4.  Flood stage at Riverton is 21.5 feet.  The flooding mainly impacted agricultural land along the River.

Hail in FREMONT, IOWA
From 03-JUN-14 19:45:00 to 03-JUN-14 19:55:00 (CST-6)
Location: PERCIVAL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FREMONT, IOWA
From 03-JUN-14 20:03:00 to 03-JUN-14 20:03:00 (CST-6)
Location: HAMBURG
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported that several large trees were downed.

Flood in FREMONT, IOWA
From 04-JUN-14 07:07:00 to 04-JUN-14 22:55:00 (CST-6)
Location: RIVERTON
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain caused the Nishnabotna River to flood around the Hamburg area on June 4th.  The river near Hamburg crested a little over 26.5 feet during the mid afternoon of June 4, flood stage is 25 feet.  The flooding mainly impacted farmland along the river.

Hail in FREMONT, IOWA
From 03-JUN-14 20:00:00 to 03-JUN-14 20:00:00 (CST-6)
Location: HAMBURG
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PAGE, IOWA
From 03-JUN-14 20:16:00 to 03-JUN-14 20:16:00 (CST-6)
Location: CLARINDA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 15:18:00 to 03-JUN-14 15:31:00 (CST-6)
Location: GRABLE
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A particularly intense downburst occurred from northwest of Crescent through the town of Cresent to southeast of the city. In this area entire trees were uprooted, outbuildings were completely destroyed, partial roof removal was observed on houses, and crops were stripped.

Flood in PAGE, IOWA
From 03-JUN-14 22:54:00 to 04-JUN-14 10:02:00 (CST-6)
Location: HEPBURN
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy rain caused the Nodaway River to flood near the Clarinda area.  The river at Clarinda reached a crest a little over 24.5 feet early in the morning of June 4, flood stage is 23 feet.  The flooding impacted a few county roads and farmland along the river.

Thunderstorm Wind in PAGE, IOWA
From 03-JUN-14 20:24:00 to 03-JUN-14 20:24:00 (CST-6)
Location: CLARINDA MUNI ARPT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hail in POTTAWATTAMIE, IOWA
From 03-JUN-14 15:53:00 to 03-JUN-14 15:53:00 (CST-6)
Location: COUNCIL BLUFFS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MILLS, IOWA
From 03-JUN-14 19:17:00 to 03-JUN-14 19:17:00 (CST-6)
Location: EMERSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported 2 inch tree limbs downed in town.

Hail in PAGE, IOWA
From 03-JUN-14 14:30:00 to 03-JUN-14 15:03:00 (CST-6)
Location: NORTHBORO
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous reports of large hail were reported from spotters and law enforcement along the track of this supercell. The hail reports ranged from golf ball to tennis ball size hail, and in some locations covered the ground.

Flash Flood in POTTAWATTAMIE, IOWA
From 03-JUN-14 16:15:00 to 03-JUN-14 16:40:00 (CST-6)
Location: LAKE MANAWA
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfall from a significant supercell caused widespread flooding across the city of Council Bluffs. Street flooding with water up to 3.5 feet deep occurred. This led to numerous cars becoming stranded and some water into homes and businesses.

Hail in POTTAWATTAMIE, IOWA
From 03-JUN-14 16:10:00 to 03-JUN-14 16:10:00 (CST-6)
Location: OAKLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in POTTAWATTAMIE, IOWA
From 03-JUN-14 16:02:00 to 03-JUN-14 16:05:00 (CST-6)
Location: BENTLEY
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This short-lived tornado impacted a number of farmsteads as it tracked quickly to the southeast. The tornado downed trees, power lines, and completely destroyed outbuildings along its path. The tornado was embedded within a larger area of damaging winds associated with this intense supercell.

Thunderstorm Wind in HARRISON, IOWA
From 03-JUN-14 15:12:00 to 03-JUN-14 15:12:00 (CST-6)
Location: RIVER SIOUX
Magnitude: 74.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Trees up to 12 inches in diameter were downed and power was knocked out. The observer estimated the winds to be near 85 mph.

Thunderstorm Wind in POTTAWATTAMIE, IOWA
From 03-JUN-14 16:55:00 to 03-JUN-14 17:10:00 (CST-6)
Location: BENTLEY
Magnitude: 95.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A particularly intense downburst associated with a supercell occurred from near 8 miles northwest of Oakland through the city of Oakland. Embedded within the downburst was a significant tornado to the west of Oakland, but otherwise the damage was caused by straight line winds. The winds downed high-tension electrical lines, downed trees, and produced some structural damage.

Thunderstorm Wind in MILLS, IOWA
From 03-JUN-14 17:56:00 to 03-JUN-14 17:56:00 (CST-6)
Location: SILVER CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Minor structural damage as well as power poles downed were reported between Mineola and Silver City.

Thunderstorm Wind in HARRISON, IOWA
From 03-JUN-14 15:30:00 to 03-JUN-14 15:30:00 (CST-6)
Location: WOODBINE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported that a grain auger and a grain dryer were blown over. The spotter estimated wind gusts to 70 mph.

Thunderstorm Wind in MONTGOMERY, IOWA
From 03-JUN-14 16:22:00 to 03-JUN-14 16:22:00 (CST-6)
Location: MC PHERSON
Magnitude: 72.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Measured on a home weather station.

Thunderstorm Wind in MILLS, IOWA
From 03-JUN-14 16:15:00 to 03-JUN-14 16:15:00 (CST-6)
Location: HENDERSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn was blown down near 380th and Brothers Ave.