A major wind and significant flash flooding event took shape across Iowa during the afternoon and evening of the 25th.  A dynamic upper level system approached Iowa from the northwest during the afternoon.  Several boundaries were in the area resulting from weak convection that took place during the morning.  Very strong theta-e advection took place over northeast Nebraska during the morning and early afternoon hours.  In addition, several other factors came into play.  Moisture continued to stream into Iowa from the remnants of Hurricane Carlotta as precipitable water values approached 2.2 inches.  Iowa was also under the influence of a coupled jet structure.  As a result a strong upper level divergent field was in place over the state.  By afternoon, mid and upper level cold air advection began to take place as well.  Strong convection took place by mid day over northeast Nebraska into west central Iowa.   The line of thunderstorms moved into rich air with surface dew points in the low to mid 70s.  The main feature with the storms was high winds.  The line of thunderstorms took on a bow echo configuration as it moved across southern Iowa.  Most of the southern three tiers of counties reported high winds.  Wind speeds of 60 to as much as 85 MPH were reported with the storms.  Wind speeds topped out at 85 MPH at New Virginia, in Warren County.  Damage was widespread with numerous trees and power lines downed by the winds.  Some trees up to 2 feet in diameter were snapped.  A flag pole was reported bent 4 inches by the high winds as well.  One tornado was reported in Warren County as well.  This was a brief tornado near St Marys which caused no damage.  The other problem with the storms was the heavy rainfall.  Two to three inches of rain fell in many areas.  As the storms moved into parts of south central and southeast Iowa, they moved into area that had been inundated by heavy rainfall just two nights before.  Flash flooding was reported in Appanoose, Lucas, Mahaska, Monroe, Wayne, Davis, and Wapello Counties.  Numerous roads were under water in these counties.    U.S. Highway 63 was closed by high water  north of Ottumwa.  Some of the worst flooding took place in Mahaska County where heavy rain fell on areas that had been flooded two days before.  At least 15 roads were reported under water in the county.  As the thunderstorms moved through Hamilton County, lightning struck a tree outside of a house in Stratford.  It also left a hole in the ground and caused damage inside the house.  The lightning strike broke windows out of the front of the house and also caused windows to break in the house next door.  Later, the storms moved into the Waterloo area.  Lightning struck the chimney of a former school building.  The top part of the chimney was blown off by the lightning and a good part of the rest of the chimney was damaged.

Thunderstorm Wind in MARION, IOWA
From 25-JUN-00 17:50:00 to 25-JUN-00 17:50:00 (CST)
Location: KNOXVILLE
Magnitude: 56 E
Property damage: 10K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in MARION, IOWA
From 25-JUN-00 17:56:00 to 25-JUN-00 17:56:00 (CST)
Location: KNOXVILLE
Magnitude: 52 E
Property damage: 2K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in WAYNE, IOWA
From 25-JUN-00 17:57:00 to 25-JUN-00 17:57:00 (CST)
Location: CORYDON
Magnitude: 52 E
Property damage: 2K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in MARION, IOWA
From 25-JUN-00 17:58:00 to 25-JUN-00 17:58:00 (CST)
Location: KNOXVILLE
Magnitude: 52 E
Property damage: 2K
Reported by: AMATEUR RADIO

Thunderstorm Wind in MONROE, IOWA
From 25-JUN-00 18:20:00 to 25-JUN-00 18:20:00 (CST)
Location: ALBIA
Magnitude: 56 E
Property damage: 3K
Reported by: TRAINED SPOTTER

Flash Flood in APPANOOSE, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 23:00:00 (CST)
Location: COUNTYWIDE
Property damage: 200K
Crop damage: 50K
Reported by: LAW ENFORCEMENT

Flash Flood in LUCAS, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 23:00:00 (CST)
Location: COUNTYWIDE
Property damage: 200K
Crop damage: 50K
Reported by: LAW ENFORCEMENT

Flash Flood in MAHASKA, IOWA
From 25-JUN-00 19:00:00 to 26-JUN-00 02:00:00 (CST)
Location: COUNTYWIDE
Property damage: 500K
Crop damage: 100K
Reported by: LAW ENFORCEMENT

Flash Flood in MONROE, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 23:00:00 (CST)
Location: COUNTYWIDE
Property damage: 200K
Crop damage: 50K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MADISON, IOWA
From 25-JUN-00 16:12:00 to 25-JUN-00 16:12:00 (CST)
Location: WINTERSET
Magnitude: 65 E
Property damage: 5K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAMS, IOWA
From 25-JUN-00 16:15:00 to 25-JUN-00 16:15:00 (CST)
Location: CORNING
Magnitude: 56 E
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CASS, IOWA
From 25-JUN-00 14:47:00 to 25-JUN-00 14:47:00 (CST)
Location: ATLANTIC
Magnitude: 65 E
Property damage: 25K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GUTHRIE, IOWA
From 25-JUN-00 15:07:00 to 25-JUN-00 15:07:00 (CST)
Location: CASEY
Magnitude: 56 E
Property damage: 10K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 17:09:00 to 25-JUN-00 17:09:00 (CST)
Location: LIBERTY CENTER
Magnitude: 50 E
Property damage: 1K
Reported by: AMATEUR RADIO

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 17:10:00 to 25-JUN-00 17:10:00 (CST)
Location: LACONA
Magnitude: 61 E
Property damage: 10K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DECATUR, IOWA
From 25-JUN-00 17:12:00 to 25-JUN-00 17:12:00 (CST)
Location: LAMONI
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAYNE, IOWA
From 25-JUN-00 17:49:00 to 25-JUN-00 17:49:00 (CST)
Location: CORYDON
Magnitude: 52 E
Property damage: 3K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in TAYLOR, IOWA
From 25-JUN-00 16:28:00 to 25-JUN-00 16:28:00 (CST)
Location: LENOX
Magnitude: 61 E
Property damage: 15K
Crop damage: 1K
Reported by: NEWSPAPER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:00:00 to 25-JUN-00 15:00:00 (CST)
Location: FONTANELLE
Magnitude: 56 E
Property damage: 10K
Crop damage: 1K
Reported by: NEWSPAPER

Thunderstorm Wind in GUTHRIE, IOWA
From 25-JUN-00 15:30:00 to 25-JUN-00 15:30:00 (CST)
Location: STUART
Magnitude: 56 E
Property damage: 15K
Reported by: NEWSPAPER

Lightning in HAMILTON, IOWA
From 25-JUN-00 17:00:00 to 25-JUN-00 17:00:00 (CST)
Location: STRATFORD
Property damage: 5K
Reported by: NEWSPAPER

Lightning in BLACK HAWK, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 19:00:00 (CST)
Location: WATERLOO
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in WAPELLO, IOWA
From 25-JUN-00 18:45:00 to 25-JUN-00 18:45:00 (CST)
Location: OTTUMWA
Magnitude: 50 E
Property damage: 3K
Reported by: NEWSPAPER

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:21:00 to 25-JUN-00 16:21:00 (CST)
Location: CUMMING
Magnitude: 61 E
Property damage: 3K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Tornado in WARREN, IOWA
From 25-JUN-00 16:22:00 to 25-JUN-00 16:22:00 (CST)
Location: ST MARYS
Tornado F-scale: F0
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Brief touchdown

Thunderstorm Wind in CLARKE, IOWA
From 25-JUN-00 16:22:00 to 25-JUN-00 16:22:00 (CST)
Location: OSCEOLA
Magnitude: 56 E
Property damage: 5K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:25:00 to 25-JUN-00 16:25:00 (CST)
Location: NEW VIRGINIA
Magnitude: 52 E
Property damage: 2K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:27:00 to 25-JUN-00 16:27:00 (CST)
Location: NEW VIRGINIA
Magnitude: 56 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in TAYLOR, IOWA
From 25-JUN-00 16:30:00 to 25-JUN-00 16:30:00 (CST)
Location: GRAVITY
Magnitude: 52 E
Property damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:37:00 to 25-JUN-00 16:37:00 (CST)
Location: NEW VIRGINIA
Magnitude: 73 E
Property damage: 30K
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in RINGGOLD, IOWA
From 25-JUN-00 16:37:00 to 25-JUN-00 16:37:00 (CST)
Location: TINGLEY
Magnitude: 52 E
Property damage: 2K
Reported by: LAW ENFORCEMENT

Flash Flood in WAYNE, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 23:00:00 (CST)
Location: COUNTYWIDE
Property damage: 100K
Crop damage: 25K
Reported by: LAW ENFORCEMENT

Flash Flood in DAVIS, IOWA
From 25-JUN-00 19:00:00 to 25-JUN-00 23:00:00 (CST)
Location: COUNTYWIDE
Property damage: 100K
Crop damage: 25K
Reported by: LAW ENFORCEMENT

Flash Flood in WAPELLO, IOWA
From 25-JUN-00 19:00:00 to 26-JUN-00 02:00:00 (CST)
Location: COUNTYWIDE
Property damage: 500K
Crop damage: 100K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAPELLO, IOWA
From 25-JUN-00 19:25:00 to 25-JUN-00 19:25:00 (CST)
Location: OTTUMWA
Magnitude: 56 E
Property damage: 15K
Crop damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CASS, IOWA
From 25-JUN-00 15:10:00 to 25-JUN-00 15:10:00 (CST)
Location: GRISWOLD
Magnitude: 56 E
Property damage: 10K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:15:00 to 25-JUN-00 15:15:00 (CST)
Location: ADAIR
Magnitude: 52 E
Property damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:19:00 to 25-JUN-00 15:19:00 (CST)
Location: GREENFIELD
Magnitude: 64 M
Property damage: 25K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:22:00 to 25-JUN-00 15:22:00 (CST)
Location: GREENFIELD
Magnitude: 52 E
Property damage: 2K
Reported by: AMATEUR RADIO

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:28:00 to 25-JUN-00 15:28:00 (CST)
Location: GREENFIELD
Magnitude: 60 M
Property damage: 10K
Crop damage: 1K
Reported by: AMATEUR RADIO

Thunderstorm Wind in DALLAS, IOWA
From 25-JUN-00 16:05:00 to 25-JUN-00 16:05:00 (CST)
Location: VAN METER
Magnitude: 52 E
Property damage: 2K
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in CLARKE, IOWA
From 25-JUN-00 16:05:00 to 25-JUN-00 16:05:00 (CST)
Location: OSCEOLA
Magnitude: 56 E
Property damage: 3K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:29:00 to 25-JUN-00 15:29:00 (CST)
Location: GREENFIELD
Magnitude: 69 E
Property damage: 25K
Crop damage: 3K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:30:00 to 25-JUN-00 15:30:00 (CST)
Location: GREENFIELD
Magnitude: 61 E
Property damage: 15K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:32:00 to 25-JUN-00 15:32:00 (CST)
Location: GREENFIELD
Magnitude: 50 E
Property damage: 2K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in ADAIR, IOWA
From 25-JUN-00 15:40:00 to 25-JUN-00 15:40:00 (CST)
Location: ORIENT
Magnitude: 52 E
Property damage: 2K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MADISON, IOWA
From 25-JUN-00 15:45:00 to 25-JUN-00 15:45:00 (CST)
Location: MACKSBURG
Magnitude: 56 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ADAMS, IOWA
From 25-JUN-00 15:55:00 to 25-JUN-00 15:55:00 (CST)
Location: CORNING
Magnitude: 52 E
Property damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in UNION, IOWA
From 25-JUN-00 15:55:00 to 25-JUN-00 15:55:00 (CST)
Location: CRESTON
Magnitude: 52 E
Property damage: 5K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in UNION, IOWA
From 25-JUN-00 15:55:00 to 25-JUN-00 15:55:00 (CST)
Location: CRESTON
Magnitude: 56 E
Property damage: 5K
Crop damage: 3K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in DALLAS, IOWA
From 25-JUN-00 15:57:00 to 25-JUN-00 15:57:00 (CST)
Location: DE SOTO
Magnitude: 52 E
Property damage: 2K
Reported by: EMERGENCY MANAGER

Thunderstorm Wind in TAYLOR, IOWA
From 25-JUN-00 16:40:00 to 25-JUN-00 16:40:00 (CST)
Location: CLEARFIELD
Magnitude: 52 E
Property damage: 4K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MADISON, IOWA
From 25-JUN-00 16:45:00 to 25-JUN-00 16:45:00 (CST)
Location: WINTERSET
Magnitude: 69 E
Property damage: 25K
Crop damage: 5K
Reported by: BROADCAST MEDIA

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:58:00 to 25-JUN-00 16:58:00 (CST)
Location: INDIANOLA
Magnitude: 52 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 25-JUN-00 16:59:00 to 25-JUN-00 16:59:00 (CST)
Location: CARLISLE
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT