A cold front moved southward into Iowa during the day on the 15th.  Moisture transport was strong with dew points reaching the 65 to 70 F. range over southern Iowa.  The atmosphere became quite unstable with MUCAPE reaching 2000 to 3000 J/kg ahead of the cold front.  The lifted index fell to -5 to -9 C.  The environment had more shear than the night before with 35 to 50 kts of effective shear.  The freezing level had risen to nearly 12,000 feet, with CAPE in the 400 to 600 J/kg in the -10 to -30 C. layer of the atmosphere.  In spite of this, the primary mode of severe weather was high winds.  The downdraft CAPE was between 700 and 1000 J/kg.  Winds of around 60 MPH were common with the storms.  One gust to 70 MPH occurred in Decatur County in the Leon area.  Many of the storms produced some hail, however for the most part it was below severe levels with a few reports of nickel size hail.

Hail in ADAMS, IOWA
From 15-JUN-08 08:43:00 to 15-JUN-08 08:43:00 (CST-6)
Location: CORNING
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Thunderstorm Wind in WAYNE, IOWA
From 15-JUN-08 10:30:00 to 15-JUN-08 10:30:00 (CST-6)
Location: SEWAL
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several large trees down in the town of Sewal, blocking roadways.  One large Catalpa tree was blown down.

Thunderstorm Wind in DECATUR, IOWA
From 15-JUN-08 09:46:00 to 15-JUN-08 09:46:00 (CST-6)
Location: LEON
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large tree limbs were blown down.

Thunderstorm Wind in APPANOOSE, IOWA
From 15-JUN-08 11:12:00 to 15-JUN-08 11:12:00 (CST-6)
Location: MOULTON
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several small tree limbs were blown down.

Thunderstorm Wind in APPANOOSE, IOWA
From 15-JUN-08 10:52:00 to 15-JUN-08 10:52:00 (CST-6)
Location: CINCINNATI
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several small limbs were blown down.

Thunderstorm Wind in DECATUR, IOWA
From 15-JUN-08 09:37:00 to 15-JUN-08 09:37:00 (CST-6)
Location: GRAND RIVER
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in RINGGOLD, IOWA
From 15-JUN-08 09:29:00 to 15-JUN-08 09:29:00 (CST-6)
Location: ELLSTON
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A few small limbs were downed.

Thunderstorm Wind in DECATUR, IOWA
From 15-JUN-08 09:43:00 to 15-JUN-08 09:43:00 (CST-6)
Location: DECATUR CITY
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in ADAMS, IOWA
From 15-JUN-08 08:37:00 to 15-JUN-08 08:37:00 (CST-6)
Location: CARBON
Magnitude: 0.88 
Property damage: 1.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Hail in BOONE, IOWA
From 15-JUN-08 09:41:00 to 15-JUN-08 09:41:00 (CST-6)
Location: BOONE
Magnitude: 0.88 
Property damage: 2.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Dime to nickel size hail reported by the Boone County Sheriff.

Thunderstorm Wind in WAYNE, IOWA
From 15-JUN-08 10:22:00 to 15-JUN-08 10:22:00 (CST-6)
Location: CORYDON
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several 4 to 5 inch diameter tree limbs were down, along with power lines down.  Some power outages were reported in the town of Corydon.

Thunderstorm Wind in ADAMS, IOWA
From 15-JUN-08 08:30:00 to 15-JUN-08 08:30:00 (CST-6)
Location: CARBON
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TAYLOR, IOWA
From 15-JUN-08 09:00:00 to 15-JUN-08 09:00:00 (CST-6)
Location: LENOX
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in UNION, IOWA
From 15-JUN-08 09:16:00 to 15-JUN-08 09:16:00 (CST-6)
Location: CRESTON
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

From Iowa Department of Transportation RWIS site.

Thunderstorm Wind in DAVIS, IOWA
From 15-JUN-08 11:10:00 to 15-JUN-08 11:10:00 (CST-6)
Location: MARK
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree limbs blown down on Highway 202 just north of Coatsville.

Thunderstorm Wind in WAYNE, IOWA
From 15-JUN-08 10:37:00 to 15-JUN-08 10:37:00 (CST-6)
Location: SEYMOUR
Magnitude: 57.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous medium to large trees and small branches blown down.  Reported by WHO TV 13.

Thunderstorm Wind in DAVIS, IOWA
From 15-JUN-08 11:28:00 to 15-JUN-08 11:28:00 (CST-6)
Location: STILES
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree limbs down on the 29000 block of Nuthatch Ave.