Temperatures warmed rapidly in advance of an approaching trough of low pressure.  Winds swung around to the south and southwest, pushing the afternoon temperatures into the mid 90s to low 100s over a large part of Iowa.  Dew point readings were in the mid 60s to low 70s, a bit lower than the previous few days due to a more mixed atmosphere.  Thunderstorms erupted ahead of the trough in central and south central Iowa by the early afternoon hours.  The main severe weather feature with these storms was strong winds.  There were numerous reports of trees down along the line of storms.  Some of the higher winds occurred in the area south of Chariton in Lucas County, were winds were estimated at 65 MPH.  In Mahaska County, 75 MPH winds hit the Oskaloosa Airport, ripping off hanger doors and pushing a truck 60 feet across the tarmac.  Sixty plus MPH winds caused damage in the Montezuma are.  Several large trees were downed and a garage, partially under construction, was downed in town.  There were a few reports of hail in Marion County, however the hail was nickel size or less.

Thunderstorm Wind in MARION, IOWA
From 20-AUG-03 14:39:00 to 20-AUG-03 14:39:00 (CST)
Location: KNOXVILLE
Magnitude: 52 EG
Property damage: 10K
Crop damage: 2K
Reported by: LAW ENFORCEMENT

Hail in MARION, IOWA
From 20-AUG-03 14:40:00 to 20-AUG-03 14:40:00 (CST)
Location: PELLA
Magnitude: 0.75 
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in MARION, IOWA
From 20-AUG-03 14:06:00 to 20-AUG-03 14:06:00 (CST)
Location: DALLAS
Magnitude: 50 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARION, IOWA
From 20-AUG-03 14:06:00 to 20-AUG-03 14:06:00 (CST)
Location: MELCHER
Magnitude: 50 EG
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in MARION, IOWA
From 20-AUG-03 14:15:00 to 20-AUG-03 14:15:00 (CST)
Location: MELCHER
Magnitude: 0.88 
Property damage: 2K
Crop damage: 10K
Reported by: UNKNOWN

Thunderstorm Wind in LUCAS, IOWA
From 20-AUG-03 14:10:00 to 20-AUG-03 14:10:00 (CST)
Location: CHARITON
Magnitude: 57 EG
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MAHASKA, IOWA
From 20-AUG-03 15:25:00 to 20-AUG-03 15:25:00 (CST)
Location: OSKALOOSA MUNI ARPT
Magnitude: 65 MG
Property damage: 20K
Crop damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in POWESHIEK, IOWA
From 20-AUG-03 15:05:00 to 20-AUG-03 15:05:00 (CST)
Location: MONTEZUMA
Magnitude: 50 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POWESHIEK, IOWA
From 20-AUG-03 15:07:00 to 20-AUG-03 15:07:00 (CST)
Location: DEEP RIVER
Magnitude: 52 EG
Property damage: 5K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POWESHIEK, IOWA
From 20-AUG-03 14:40:00 to 20-AUG-03 15:00:00 (CST)
Location: MONTEZUMA
Magnitude: 52 EG
Property damage: 15K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MAHASKA, IOWA
From 20-AUG-03 15:22:00 to 20-AUG-03 15:22:00 (CST)
Location: OSKALOOSA
Magnitude: 50 EG
Property damage: 3K
Reported by: UNKNOWN

Thunderstorm Wind in WAYNE, IOWA
From 20-AUG-03 13:50:00 to 20-AUG-03 13:50:00 (CST)
Location: HUMESTON
Magnitude: 50 EG
Property damage: 5K
Reported by: UNKNOWN