A very humid airmass was in place over Iowa during the afternoon of the 10th into the evening.   High temperatures were not all that high with upper 70s and 80s common.  Dew point temperatures were in the low to mid 70s.  A cold front approached Iowa from the northwest.  Thunderstorms fired up along the front.  The main focus of thunderstorm development was over eastern Nebraska into western Iowa.  A strong low level jet developed during the early evening hours.   The combination of high amounts of low level moisture and the strong low level jet impinging on the approaching front was enough to break the cap in spite of a +13 C. temperature at 700 mb over Omaha.  The storms formed into a Mesoscale Convective System.  Though there was some hail with the thunderstorms, the main severe weather event was high winds.  The lead edge of the system transitioned into a bow echo and produced winds of 60 to 70 MPH in several locations.  One of the higher winds was at the apex of the bow echo.  Seventy one MPH winds swept through the Fort Dodge area of Webster County.  There were numerous reports of tree damage across western into parts of central Iowa.  Scattered reports were received of power poles being blown down by the high wind.  Southwest of Clarion in Wright County, high winds downed several power poles for example.

Thunderstorm Wind in GREENE, IOWA
From 10-JUN-02 23:30:00 to 10-JUN-02 23:30:00 (CST)
Location: CHURDAN
Magnitude: 52 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CARROLL, IOWA
From 10-JUN-02 22:45:00 to 10-JUN-02 22:45:00 (CST)
Location: MANNING
Magnitude: 52 E
Property damage: 5K
Reported by: NEWSPAPER

Thunderstorm Wind in WEBSTER, IOWA
From 10-JUN-02 23:58:00 to 10-JUN-02 23:58:00 (CST)
Location: FT DODGE
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WRIGHT, IOWA
From 11-JUN-02 00:20:00 to 11-JUN-02 00:20:00 (CST)
Location: CLARION
Magnitude: 61 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in CRAWFORD, IOWA
From 10-JUN-02 22:27:00 to 10-JUN-02 22:27:00 (CST)
Location: CHARTER OAK
Magnitude: 56 E
Property damage: 10K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in CRAWFORD, IOWA
From 10-JUN-02 22:30:00 to 10-JUN-02 22:30:00 (CST)
Location: RICKETTS
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WRIGHT, IOWA
From 11-JUN-02 00:10:00 to 11-JUN-02 00:10:00 (CST)
Location: EAGLE GROVE
Magnitude: 56 E
Property damage: 15K
Reported by: NEWSPAPER

Thunderstorm Wind in CARROLL, IOWA
From 10-JUN-02 23:16:00 to 10-JUN-02 23:16:00 (CST)
Location: CARROLL NEU ARPT
Magnitude: 50 M
Property damage: 2K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in CARROLL, IOWA
From 10-JUN-02 22:56:00 to 10-JUN-02 22:56:00 (CST)
Location: HALBUR
Magnitude: 52 E
Property damage: 3K
Reported by: AMATEUR RADIO

Thunderstorm Wind in CRAWFORD, IOWA
From 10-JUN-02 22:32:00 to 10-JUN-02 22:32:00 (CST)
Location: DENISON
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WEBSTER, IOWA
From 10-JUN-02 23:55:00 to 10-JUN-02 23:55:00 (CST)
Location: FT DODGE MUNI ARPT
Magnitude: 62 M
Property damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC