The very unstable atmospheric condition over the central U.S. remained unchanged from what it had been during previous days.  A strong cold front approached from the west as intense low pressure in the upper atmosphere lifted northeast into South Dakota during the day.  Deep moisture was in place over the central U.S. with dew points at the 850 mb level at or approaching 20 degrees C.  Numerous boundaries were in place across the state from the previous nights convection.  Strong convection developed over Missouri during the early afternoon hours.  This convection lifted north into Iowa during the afternoon.  A line of severe thunderstorms moved into south central Iowa.  This line moved northeast rapidly across the state along with an apparent gravity wave seen in satellite imagery.  The main severe weather event was high winds.  Though there were a few reports of large hail, most of the hail was no larger than marble size.  Numerous reports of 60 to 70 MPH winds were received over south central into northeast Iowa.  Tree and power line damage was widespread.  As the storms moved through Black Hawk  County, high winds swept into La Porte City.  Trees were toppled in town.  One fell on a police squad car, trapping the officer inside the car for a period of time.  The echo pattern of the thunderstorms took on a LEWP (Line Echo Wave Pattern) by late afternoon.  The mesoscale vorticity center was quite evident in the radar imagery as it passed over Mahaska County.  A small tornado formed near the crest of the wave and touched down northeast of the town of Oskaloosa.  Five buildings were damaged at a farm there and 2 x 4's were driven into a hog confinement building.  The damage path was approximately one eighth mile long and 100 yards wide.

Thunderstorm Wind in MAHASKA, IOWA
From 14-JUN-01 15:30:00 to 14-JUN-01 15:30:00 (CST)
Location: OSKALOOSA
Magnitude: 65 E
Property damage: 25K
Crop damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in APPANOOSE, IOWA
From 14-JUN-01 15:10:00 to 14-JUN-01 15:10:00 (CST)
Location: MOULTON
Magnitude: 61 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in RINGGOLD, IOWA
From 14-JUN-01 14:05:00 to 14-JUN-01 14:05:00 (CST)
Location: KELLERTON
Magnitude: 56 E
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 14:15:00 to 14-JUN-01 14:15:00 (CST)
Location: LAMONI
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in CLARKE, IOWA
From 14-JUN-01 14:37:00 to 14-JUN-01 14:37:00 (CST)
Location: WELDON
Magnitude: 52 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in BLACK HAWK, IOWA
From 14-JUN-01 16:50:00 to 14-JUN-01 16:50:00 (CST)
Location: LA PORTE CITY
Magnitude: 61 E
Property damage: 10K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 14:40:00 to 14-JUN-01 14:40:00 (CST)
Location: LEON
Magnitude: 56 E
Property damage: 20K
Reported by: NEWSPAPER

Thunderstorm Wind in LUCAS, IOWA
From 14-JUN-01 14:51:00 to 14-JUN-01 14:51:00 (CST)
Location: CHARITON
Magnitude: 52 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GRUNDY, IOWA
From 14-JUN-01 16:30:00 to 14-JUN-01 16:30:00 (CST)
Location: REINBECK
Magnitude: 52 E
Property damage: 15K
Reported by: NEWSPAPER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 13:47:00 to 14-JUN-01 13:47:00 (CST)
Location: LAMONI
Magnitude: 56 E
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in POWESHIEK, IOWA
From 14-JUN-01 16:00:00 to 14-JUN-01 16:00:00 (CST)
Location: MONTEZUMA
Magnitude: 56 E
Property damage: 27K
Reported by: NEWSPAPER

Thunderstorm Wind in RINGGOLD, IOWA
From 14-JUN-01 13:46:00 to 14-JUN-01 13:46:00 (CST)
Location: MT AYR
Magnitude: 52 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POWESHIEK, IOWA
From 14-JUN-01 16:15:00 to 14-JUN-01 16:15:00 (CST)
Location: MALCOLM
Magnitude: 52 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in POWESHIEK, IOWA
From 14-JUN-01 17:00:00 to 14-JUN-01 17:00:00 (CST)
Location: MONTEZUMA
Magnitude: 52 E
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in MONROE, IOWA
From 14-JUN-01 15:01:00 to 14-JUN-01 15:01:00 (CST)
Location: ALBIA
Magnitude: 56 E
Property damage: 10K
Reported by: NEWSPAPER

Tornado in MAHASKA, IOWA
From 14-JUN-01 15:45:00 to 14-JUN-01 15:45:00 (CST)
Location: OSKALOOSA
Tornado F-scale: F1
Property damage: 40K
Crop damage: 2K
Reported by: EMERGENCY MANAGER

Brief touchdown on a farm northeast of Oskaloosa.  Several buildings damaged.

Thunderstorm Wind in CLARKE, IOWA
From 14-JUN-01 14:44:00 to 14-JUN-01 14:44:00 (CST)
Location: OSCEOLA
Magnitude: 56 E
Property damage: 10K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 13:52:00 to 14-JUN-01 13:52:00 (CST)
Location: LAMONI
Magnitude: 56 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Hail in DECATUR, IOWA
From 14-JUN-01 14:28:00 to 14-JUN-01 14:28:00 (CST)
Location: VAN WERT
Magnitude: 0.75 
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MAHASKA, IOWA
From 14-JUN-01 15:40:00 to 14-JUN-01 15:40:00 (CST)
Location: OSKALOOSA
Magnitude: 62 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAYNE, IOWA
From 14-JUN-01 14:25:00 to 14-JUN-01 14:25:00 (CST)
Location: HUMESTON
Magnitude: 61 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAPELLO, IOWA
From 14-JUN-01 15:36:00 to 14-JUN-01 15:36:00 (CST)
Location: OTTUMWA
Magnitude: 50 E
Property damage: 10K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 14:20:00 to 14-JUN-01 14:20:00 (CST)
Location: DAVIS CITY
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARION, IOWA
From 14-JUN-01 15:05:00 to 14-JUN-01 15:05:00 (CST)
Location: KNOXVILLE
Magnitude: 52 E
Property damage: 3K
Reported by: UNKNOWN

Thunderstorm Wind in UNION, IOWA
From 14-JUN-01 13:43:00 to 14-JUN-01 13:43:00 (CST)
Location: AFTON
Magnitude: 56 E
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in DECATUR, IOWA
From 14-JUN-01 13:45:00 to 14-JUN-01 13:45:00 (CST)
Location: GARDEN GROVE
Magnitude: 56 E
Property damage: 25K
Reported by: NEWSPAPER

Thunderstorm Wind in MONROE, IOWA
From 14-JUN-01 15:05:00 to 14-JUN-01 15:05:00 (CST)
Location: ALBIA
Magnitude: 52 E
Property damage: 5K
Reported by: NEWSPAPER