A powerful upper level system was moving into south central Canada.  The upper level winds were increasing as a closed upper low settled into that area.  Warm air advection continued across Iowa through the night of the 29th into the morning of the 30th.  The atmosphere was very unstable with CAPE values around 4000 J/kg.  Downdraft CAPE was between 1000 and 1500 J/kg, with CAPE in the -10 to -30 C layer of the atmosphere in the 600 to 800 J/kg range.  Strong shear was present, with an effective shear of 50 to 60 kts.  The freezing level was quite high, between 14,000 and 15,000 feet.  Precipitable water increased to between 1.5 and 1.8 inches.  There was a considerable amount of CAPE in the 0-3 km layer of the atmosphere, between 100 and 175 J/kg.  That combined with an LCl of only 750 meters was a favorable environment for tornado development.  Thunderstorms formed rapidly in northwest and north central Iowa by the late afternoon and evening hours.  They spread and continued to move east through the night.  All modes of severe weather occurred with tornadoes occurring during the early and mid evening hours.  Two tornadoes were reported in the Stanhope area near the Webster and Hamilton County line.  A tornado touched down in Grundy County north of Conrad.  Winds caused damage in many areas across the north half of Iowa.  Hail was common with most of the storms in spite of the high freezing level.  Much of the hail an inch or less in diameter.  Larger hail of golf ball to tennis ball size fell in Butler and Bremer Counties.  A strong storm formed in Ringgold and Union Counties and dropped golf ball size hail.  The event produced very heavy rainfall in many locations.  The ground had become nearly saturated from previous rounds of storms during the week prior.  Flooding and flash flooding became a problem in several locations.

Thunderstorm Wind in WEBSTER, IOWA
From 29-JUN-14 17:55:00 to 29-JUN-14 17:55:00 (CST-6)
Location: KALO
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Spotter reported that thunderstorm wind gusts blew down corn stalks.  Nickel to dime size hail also fell.

Heavy Rain in CALHOUN, IOWA
From 30-JUN-14 03:30:00 to 30-JUN-14 06:00:00 (CST-6)
Location: ROCKWELL CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Estimated to have fallen in the last 2 to 3 hours.

Heavy Rain in TAMA, IOWA
From 29-JUN-14 19:35:00 to 29-JUN-14 20:20:00 (CST-6)
Location: LINCOLN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Spotter reported 2 inches of rain in 45 minutes in Lincoln.

Heavy Rain in SAC, IOWA
From 30-JUN-14 03:00:00 to 30-JUN-14 06:00:00 (CST-6)
Location: SAC CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rain fell fell between 3 AM and 6 AM.

Hail in BUTLER, IOWA
From 29-JUN-14 18:56:00 to 29-JUN-14 18:56:00 (CST-6)
Location: CLARKSVILLE
Magnitude: 1.00 
Property damage: 5.00K
Crop damage: 25.00K
Reported by: Emergency Manager

Emergency Manager reported 1 inch diameter hail and winds of 50 to 60 MPH.

Heavy Rain in CALHOUN, IOWA
From 30-JUN-14 04:15:00 to 30-JUN-14 05:45:00 (CST-6)
Location: ROCKWELL CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Estimated to have fall in the last 1 1/2 hours.

Hail in BUTLER, IOWA
From 29-JUN-14 18:40:00 to 29-JUN-14 18:40:00 (CST-6)
Location: BRISTOW
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Tornado in HAMILTON, IOWA
From 29-JUN-14 18:28:00 to 29-JUN-14 18:33:00 (CST-6)
Location: STANHOPE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 2.00K
Reported by: Storm Chaser

Tornado captured on video from chasers to the northeast of Stanhope.

Tornado in HARDIN, IOWA
From 29-JUN-14 19:25:00 to 29-JUN-14 19:28:00 (CST-6)
Location: GIFFORD
Tornado F-scale: EF1
Property damage: 1.00K
Crop damage: 2.00K
Reported by: NWS Storm Survey

Short track tornado hit a cemetery and then moved southeast with minor roof damage to a house before lifting.

Hail in BUTLER, IOWA
From 29-JUN-14 18:46:00 to 29-JUN-14 18:46:00 (CST-6)
Location: WILMAR
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:48:00 to 29-JUN-14 18:48:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:54:00 to 29-JUN-14 18:54:00 (CST-6)
Location: PACKARD
Magnitude: 1.50 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Tornado in GRUNDY, IOWA
From 29-JUN-14 19:18:00 to 29-JUN-14 19:22:00 (CST-6)
Location: MORRISON
Tornado F-scale: EF1
Property damage: 30.00K
Crop damage: 2.00K
Reported by: Law Enforcement

Brief tornado passed through the northern edge of Morrison.

Flash Flood in HARDIN, IOWA
From 29-JUN-14 20:30:00 to 30-JUN-14 00:30:00 (CST-6)
Location: LAWN HILLS
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported 260th Street near County Highway S55 was washed out due to water running over the road.

Hail in BUTLER, IOWA
From 29-JUN-14 18:54:00 to 29-JUN-14 18:54:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:53:00 to 29-JUN-14 18:55:00 (CST-6)
Location: PACKARD
Magnitude: 2.00 
Property damage: 20.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Flash Flood in HARDIN, IOWA
From 29-JUN-14 20:00:00 to 30-JUN-14 01:30:00 (CST-6)
Location: ACKLEY
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was running over the road.  County closed the road.

Hail in AUDUBON, IOWA
From 29-JUN-14 17:45:00 to 29-JUN-14 17:50:00 (CST-6)
Location: POPLAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 1.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:51:00 to 29-JUN-14 18:54:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Hail in AUDUBON, IOWA
From 29-JUN-14 17:53:00 to 29-JUN-14 17:55:00 (CST-6)
Location: IMBALLTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:43:00 to 29-JUN-14 18:45:00 (CST-6)
Location: WILMAR
Magnitude: 1.25 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:43:00 to 29-JUN-14 18:45:00 (CST-6)
Location: WILMAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Flash Flood in BLACK HAWK, IOWA
From 29-JUN-14 20:30:00 to 30-JUN-14 01:45:00 (CST-6)
Location: ORANGE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Hamond Ave between East Shaulis and East Orange Road had water flowing over the road to a depth of 1 foot.

Hail in BUTLER, IOWA
From 29-JUN-14 18:55:00 to 29-JUN-14 18:57:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Hail in CARROLL, IOWA
From 29-JUN-14 18:54:00 to 29-JUN-14 18:54:00 (CST-6)
Location: COON RAPIDS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in BUTLER, IOWA
From 29-JUN-14 18:44:00 to 29-JUN-14 18:47:00 (CST-6)
Location: ALLISON MUNI ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in AUDUBON, IOWA
From 29-JUN-14 17:57:00 to 29-JUN-14 17:59:00 (CST-6)
Location: IMBALLTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:55:00 to 29-JUN-14 18:55:00 (CST-6)
Location: PACKARD
Magnitude: 2.00 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Social Media

Hail in WEBSTER, IOWA
From 29-JUN-14 19:01:00 to 29-JUN-14 19:02:00 (CST-6)
Location: GOWRIE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Hail in BUTLER, IOWA
From 29-JUN-14 18:45:00 to 29-JUN-14 18:48:00 (CST-6)
Location: WILMAR
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Flash Flood in BLACK HAWK, IOWA
From 29-JUN-14 21:30:00 to 30-JUN-14 01:45:00 (CST-6)
Location: LA PORTE CITY ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The 10500 block of Dysart was closed due to water running over the road.

Hail in RINGGOLD, IOWA
From 29-JUN-14 20:00:00 to 29-JUN-14 20:00:00 (CST-6)
Location: KNOWLTON
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Broadcast Media

Hail in BUTLER, IOWA
From 29-JUN-14 18:45:00 to 29-JUN-14 18:47:00 (CST-6)
Location: ALLISON MUNI ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:54:00 to 29-JUN-14 18:56:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Flash Flood in GRUNDY, IOWA
From 29-JUN-14 21:15:00 to 30-JUN-14 01:30:00 (CST-6)
Location: REINBECK
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Highway 175 north of Reinbeck closed by county officials by water over the road.

Hail in FRANKLIN, IOWA
From 29-JUN-14 18:26:00 to 29-JUN-14 18:28:00 (CST-6)
Location: GENEVA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in UNION, IOWA
From 29-JUN-14 20:31:00 to 29-JUN-14 20:31:00 (CST-6)
Location: LORIMOR
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Hail in BUTLER, IOWA
From 29-JUN-14 18:48:00 to 29-JUN-14 18:50:00 (CST-6)
Location: WILMAR
Magnitude: 1.50 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:59:00 to 29-JUN-14 19:02:00 (CST-6)
Location: PACKARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Thunderstorm Wind in MADISON, IOWA
From 29-JUN-14 20:40:00 to 29-JUN-14 20:40:00 (CST-6)
Location: TRURO
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Winds were estimated to be gusting to 60 MPH.

Hail in FRANKLIN, IOWA
From 29-JUN-14 18:27:00 to 29-JUN-14 18:28:00 (CST-6)
Location: GENEVA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:48:00 to 29-JUN-14 18:51:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Hail in HAMILTON, IOWA
From 29-JUN-14 18:31:00 to 29-JUN-14 18:31:00 (CST-6)
Location: KAMRAR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Intersection of Highway 17 and 265th St.

Thunderstorm Wind in TAMA, IOWA
From 29-JUN-14 19:58:00 to 29-JUN-14 20:01:00 (CST-6)
Location: LINCOLN
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two foot diameter trees snapped.

Hail in BUTLER, IOWA
From 29-JUN-14 18:41:00 to 29-JUN-14 18:43:00 (CST-6)
Location: BRISTOW
Magnitude: 1.25 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:51:00 to 29-JUN-14 18:52:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 15.00K
Reported by: SHAVE Project

Hail in BUTLER, IOWA
From 29-JUN-14 18:52:00 to 29-JUN-14 18:52:00 (CST-6)
Location: PACKARD
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Thunderstorm Wind in WEBSTER, IOWA
From 29-JUN-14 17:54:00 to 29-JUN-14 17:54:00 (CST-6)
Location: BURNSIDE
Magnitude: 65.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Widespread damage to a farm southeast of Otho.  Damage to trees and outbuildings.  Roof removed from one building.  Damage was also reported to a home.

Thunderstorm Wind in MARION, IOWA
From 29-JUN-14 21:38:00 to 29-JUN-14 21:40:00 (CST-6)
Location: PELLA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in BUTLER, IOWA
From 29-JUN-14 18:49:00 to 29-JUN-14 18:52:00 (CST-6)
Location: PACKARD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: SHAVE Project

Thunderstorm Wind in GREENE, IOWA
From 30-JUN-14 03:05:00 to 30-JUN-14 03:05:00 (CST-6)
Location: PATON
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A large tree was down across a road in town.