Just as the first MCS from the previous night exited the state, another round of strong convection moved in from the northwest.  The airmass remained quite unstable in spite of the activity from overnight as unstable air replaced the airmass over the state and reloaded the atmosphere.  CAPE remained in the 4000 to 4500 J/kg range with lifted indices in the -10 to -12 C. range at sunrise.  Shear continued to be modest, around 20 kts.  There was little change in the freezing level overnight, and it remained just over 13,000 feet.  The main mode of severe weather during this event was high winds initially, then more of a transition to flash flooding.  There were several reports of winds of 65 to 75 MPH.  The highest measured wind speed was a 76 MPH wind gust at the Coon Rapids Schoolnet site.  Meanwhile, a severe thunderstorm produced a measured 75 MPH wind gust in Dallas County.  Winds gusted to 70 MPH or greater in both Carroll and Greene Counties.  Elsewhere, reports of 60 to 65 MPH winds were numerous.  Though many of the storms produced hail, there were only a few reports of three-quarter to one inch diameter hail.  Flash flooding became a problem as the storms traversed the same areas that were hit the previous night. Flash flooding was most notable in Warren, Monroe, Polk, and Boone Counties.  Many streets were flooded with water reported anywhere from 8 to 30 inches deep.  A strong high/low couplet developed in the wake of the convection.  Winds gusted to around 60 MPH in Boone County in the city of Boone for a short period of time.

Thunderstorm Wind in WARREN, IOWA
From 26-JUN-08 09:25:00 to 26-JUN-08 09:25:00 (CST-6)
Location: INDIANOLA
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were down on the south side of town.

Thunderstorm Wind in WEBSTER, IOWA
From 26-JUN-08 08:07:00 to 26-JUN-08 08:07:00 (CST-6)
Location: FT DODGE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds with heavy rain.  Large tree branches down.

Flash Flood in MONROE, IOWA
From 26-JUN-08 13:00:00 to 26-JUN-08 15:30:00 (CST-6)
Location: MELROSE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Street flooding up to 2 feet deep reported in downtown Melrose.  The downtown area was barricaded.

Thunderstorm Wind in DALLAS, IOWA
From 26-JUN-08 08:11:00 to 26-JUN-08 08:11:00 (CST-6)
Location: DAWSON
Magnitude: 65.00 MG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Report was relayed by KCCI of a viewer with a weather station.

Flash Flood in BOONE, IOWA
From 26-JUN-08 09:07:00 to 26-JUN-08 14:00:00 (CST-6)
Location: MOINGONA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was reported over numerous intersections and streets with 1.80 inches of rainfall in a short period of time.

Thunderstorm Wind in POLK, IOWA
From 26-JUN-08 08:58:00 to 26-JUN-08 08:58:00 (CST-6)
Location: ANKENY
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in JASPER, IOWA
From 26-JUN-08 09:22:00 to 26-JUN-08 09:22:00 (CST-6)
Location: PRAIRIE CITY
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in BOONE, IOWA
From 26-JUN-08 08:17:00 to 26-JUN-08 08:17:00 (CST-6)
Location: BOXHOLM
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in STORY, IOWA
From 26-JUN-08 08:53:00 to 26-JUN-08 08:53:00 (CST-6)
Location: AMES ARPT
Magnitude: 50.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

High Wind in BOONE, IOWA
From 26-JUN-08 09:00:00 to 26-JUN-08 10:00:00 (CST-6)
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported one and one half inches of rain in a short period of time, followed by high winds from the northeast.

Hail in GREENE, IOWA
From 26-JUN-08 07:03:00 to 26-JUN-08 07:03:00 (CST-6)
Location: CHURDAN
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 10.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in STORY, IOWA
From 26-JUN-08 09:05:00 to 26-JUN-08 09:05:00 (CST-6)
Location: AMES ARPT
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

South bound Highway 69 was blocked by downed trees and power lines.

Thunderstorm Wind in CALHOUN, IOWA
From 26-JUN-08 07:31:00 to 26-JUN-08 07:31:00 (CST-6)
Location: LAKE CITY
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CALHOUN, IOWA
From 26-JUN-08 07:35:00 to 26-JUN-08 07:35:00 (CST-6)
Location: ROCKWELL CITY
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in CARROLL, IOWA
From 26-JUN-08 07:41:00 to 26-JUN-08 07:41:00 (CST-6)
Location: COON RAPIDS
Magnitude: 66.00 MG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Mesonet

Measurement was taken by the Coon Rapids Bayard Schoolnet site.

Thunderstorm Wind in CALHOUN, IOWA
From 26-JUN-08 08:03:00 to 26-JUN-08 08:03:00 (CST-6)
Location: FARNHAMVILLE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GREENE, IOWA
From 26-JUN-08 08:03:00 to 26-JUN-08 08:03:00 (CST-6)
Location: CHURDAN
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees were downed along with pea size hail and heavy rain falling.

Thunderstorm Wind in CALHOUN, IOWA
From 26-JUN-08 07:20:00 to 26-JUN-08 07:20:00 (CST-6)
Location: LAKE CITY
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement received a call from a trained spotter of 60 to 70 MPH wind gusts.  Trees were down and the power was out in Lake City.

Flash Flood in MONROE, IOWA
From 26-JUN-08 13:00:00 to 26-JUN-08 15:30:00 (CST-6)
Location: TYRONE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was over the road on 579th between 224th and 227th.  Water was also over the road at 210th Trail.

Flash Flood in MONROE, IOWA
From 26-JUN-08 13:00:00 to 26-JUN-08 15:30:00 (CST-6)
Location: ALBIA MUNI ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was over the road at 189th and 625th Ave.  Several County roads were under water across the western portion of the county.  A stalled vehicle had to be pushed out of the water.

Thunderstorm Wind in CARROLL, IOWA
From 26-JUN-08 07:20:00 to 26-JUN-08 07:20:00 (CST-6)
Location: CARROLL
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported 70 MPH winds at the intersection of Highways 30 and 71.

Thunderstorm Wind in CARROLL, IOWA
From 26-JUN-08 07:27:00 to 26-JUN-08 07:27:00 (CST-6)
Location: CARROLL
Magnitude: 56.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CARROLL, IOWA
From 26-JUN-08 07:23:00 to 26-JUN-08 07:23:00 (CST-6)
Location: CARROLL
Magnitude: 52.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Mesonet

Measured gust by the Carroll Kuemper Catholic Schoolnet site.

Thunderstorm Wind in CRAWFORD, IOWA
From 26-JUN-08 07:00:00 to 26-JUN-08 07:00:00 (CST-6)
Location: CHARTER OAK
Magnitude: 57.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were down in town.

Thunderstorm Wind in CRAWFORD, IOWA
From 26-JUN-08 07:00:00 to 26-JUN-08 07:00:00 (CST-6)
Location: SCHLESWIG
Magnitude: 57.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were reported down.

Thunderstorm Wind in GREENE, IOWA
From 26-JUN-08 07:48:00 to 26-JUN-08 07:48:00 (CST-6)
Location: RALSTON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Four to six inch tree limbs were blown down.

Flash Flood in POLK, IOWA
From 26-JUN-08 10:24:00 to 26-JUN-08 14:00:00 (CST-6)
Location: DES MOINES
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Six to 8 inches of water running over the road at 22nd and Logan.

Flash Flood in WARREN, IOWA
From 26-JUN-08 04:05:00 to 26-JUN-08 09:15:00 (CST-6)
Location: MEDORA
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Ray Street and Highway 69 was washed out. County G76 and Highway 69 had the shoulder washed out.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:00:00 to 26-JUN-08 14:00:00 (CST-6)
Location: URBANDALE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water flowing over Douglas near Merle Hay Road.

Thunderstorm Wind in WEBSTER, IOWA
From 26-JUN-08 08:20:00 to 26-JUN-08 08:20:00 (CST-6)
Location: HARCOURT
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree was down on a house.  Other limb damage also reported.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:04:00 to 26-JUN-08 14:04:00 (CST-6)
Location: CLOVER HILLS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Valley West Drive and Westown Parkway had two and one half feet of water depth that drowned out a police squad car.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:15:00 to 26-JUN-08 14:15:00 (CST-6)
Location: URBANDALE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Two and one half feet of water in the intersection of 63rd and Hickman Road.

Hail in CALHOUN, IOWA
From 26-JUN-08 08:03:00 to 26-JUN-08 08:03:00 (CST-6)
Location: FARNHAMVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Heavy Rain in WAYNE, IOWA
From 26-JUN-08 02:45:00 to 26-JUN-08 03:56:00 (CST-6)
Location: CORYDON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two inches of rain was reported.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:29:00 to 26-JUN-08 14:00:00 (CST-6)
Location: LOVINGTON
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Water over the road at 55th and Beaver Drive.

Flash Flood in BOONE, IOWA
From 26-JUN-08 08:55:00 to 26-JUN-08 14:00:00 (CST-6)
Location: MOINGONA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Extensive street flooding in Boone.  Flash flooding reported at 150th and 139th St. in Boone County.

Thunderstorm Wind in CRAWFORD, IOWA
From 26-JUN-08 07:07:00 to 26-JUN-08 07:07:00 (CST-6)
Location: DENISON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Single tree felled by winds with other tree damage reported.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:00:00 to 26-JUN-08 14:00:00 (CST-6)
Location: LOVINGTON
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One foot of running water over the intersection of Douglas and Merle Hay Roads.

Thunderstorm Wind in CARROLL, IOWA
From 26-JUN-08 07:31:00 to 26-JUN-08 07:31:00 (CST-6)
Location: CARROLL
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down in the city of Carroll.

Flash Flood in WARREN, IOWA
From 26-JUN-08 09:05:00 to 26-JUN-08 14:15:00 (CST-6)
Location: NORWALK
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Water reported over numerous city streets.

Thunderstorm Wind in STORY, IOWA
From 26-JUN-08 09:04:00 to 26-JUN-08 09:04:00 (CST-6)
Location: AMES
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large branches were blown down.

Thunderstorm Wind in STORY, IOWA
From 26-JUN-08 09:05:00 to 26-JUN-08 09:05:00 (CST-6)
Location: HUXLEY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were reported down.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:13:00 to 26-JUN-08 14:00:00 (CST-6)
Location: DES MOINES
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water depth was 9 inches over a 300 foot area of Martin Luther King and Delaware with vehicle stalled out in the intersection.

Flash Flood in POLK, IOWA
From 26-JUN-08 09:59:00 to 26-JUN-08 14:00:00 (CST-6)
Location: MITCHELLVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

On I-80, four inches of water was on the interstate east of the east mix master.

Hail in DALLAS, IOWA
From 26-JUN-08 05:42:00 to 26-JUN-08 05:42:00 (CST-6)
Location: BOUTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Fire Department/Rescue

Hail in GUTHRIE, IOWA
From 26-JUN-08 08:02:00 to 26-JUN-08 08:02:00 (CST-6)
Location: JAMAICA
Magnitude: 1.00 
Property damage: 3.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Nickel to quarter size hail occurring.