A cold front entered the state from the northwest.  The atmosphere became very unstable with CAPE rising to near 5000 J/kg and lifted indices falling to around -10 C.  There was strong moisture inflow ahead of a pre-frontal trough and upper level shortwave moving across the state.  Thunderstorms fired over southwest Iowa by mid morning and tracked east-northeast.  The atmosphere was quite warm with freezing levels near 15,000 ft.  Little hail occurred with the storms.  Downdraft CAPE increased to around 1400 J/kg ahead of the storms in southeast Iowa.  Thunderstorms formed initially over southwest Iowa and moved northeast and east.  Thunderstorms caused high winds in the Bedford area of Taylor County, causing damage in the town.  Downburst winds began to take place with 60 to 70 MPH wind gusts reported in Davis and Appanoose Counties.  The storms also produced very heavy rainfall.  Rainfall of 2 inches in less than an hour occurred in Wapello County, resulting in flash flooding in Ottumwa.  The initial round of thunderstorms moved east of the area.  By later afternoon and early evening, thunderstorms reformed over northern Missouri and pushed northeast into southeast Iowa.  They produced spotty high winds and another round of heavy rainfall.  Flash flooding resulted from the heavy rainfall.  Water was flowing over roads with some bridges were under water in Appanoose and Davis Counties.

Thunderstorm Wind in TAYLOR, IOWA
From 13-AUG-10 11:20:00 to 13-AUG-10 11:20:00 (CST-6)
Location: BEDFORD
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

High winds downed large tree branches in Bedford.

Flash Flood in DAVIS, IOWA
From 13-AUG-10 15:00:00 to 13-AUG-10 21:25:00 (CST-6)
Location: CARBON
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Bridge impassable due to flash flooding.

Thunderstorm Wind in APPANOOSE, IOWA
From 13-AUG-10 19:07:00 to 13-AUG-10 19:07:00 (CST-6)
Location: MYSTIC
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter near Mystic reports 2 large trees and numerous branches and limbs down from severe straight line winds.

Flash Flood in WAPELLO, IOWA
From 13-AUG-10 13:40:00 to 13-AUG-10 21:25:00 (CST-6)
Location: OTTUMWA
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Ottumwa reported water flowing through the streets deep enough to stall multiple vehicles.  He also estimated 2 inches of rain in the last hour.

Thunderstorm Wind in APPANOOSE, IOWA
From 13-AUG-10 12:45:00 to 13-AUG-10 12:45:00 (CST-6)
Location: JEROME
Magnitude: 57.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated 60 to 70 MPH wind gust.

Thunderstorm Wind in DAVIS, IOWA
From 13-AUG-10 13:35:00 to 13-AUG-10 13:35:00 (CST-6)
Location: FLORIS
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Large trees were blown down onto a gravel road.

Thunderstorm Wind in APPANOOSE, IOWA
From 13-AUG-10 13:01:00 to 13-AUG-10 13:01:00 (CST-6)
Location: CENTERVILLE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Winds was 40 MPH sustained, with gusts to 60 MPH.

Thunderstorm Wind in DAVIS, IOWA
From 13-AUG-10 13:25:00 to 13-AUG-10 13:25:00 (CST-6)
Location: WEST GROVE
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter estimated winds gusting up to 60 MPH.

Thunderstorm Wind in DAVIS, IOWA
From 13-AUG-10 13:47:00 to 13-AUG-10 13:47:00 (CST-6)
Location: PULASKI
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire department reported winds gusts of up to 60 MPH.

Flash Flood in APPANOOSE, IOWA
From 13-AUG-10 17:25:00 to 13-AUG-10 21:25:00 (CST-6)
Location: DARBYVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water of unknown depth was flowing over paved County Road J29 at a rapid pace.  Road was barricaded.