A very unstable airmass was in place across Iowa during the morning of the 23rd.  Thunderstorms erupted by the late morning hours as an upper level disturbance advanced into the state from the west.  A small cluster of thunderstorms formed in as the mesoscale convective vorticity center from a round of convection over the high plains the previous night moved into air with CAPE values around 4000 J/kg.  A warm front was lifting north across the state as well with surface dew points in the mid 70s to the south of the front.  Although there were some reports of some small hail, less than in inch in diameter, from the storms; the main weather feature from these storms was high winds.  The strongest winds occurred in Indianola as a microburst resulted in a wind gust of 109 MPH.  High winds caused considerable tree damage and some building damage across south central Iowa as the cluster of storms moved east.  A mobile home was knocked off of its foundation in the Moulton area as the storms moved through.  One small tornado touched down briefly in Wayne County near Corydon.  No significant damage was reported with this tornado.  The same cluster of storms that moved across the far southern tier of Iowas counties produced high winds to the north of it.  In Lucas County, strong south winds flowing out of the cluster caused damage on a farm near Chariton.  A machine shed was destroyed with pieces of the building swept downwind for about one half mile.

Thunderstorm Wind in MONROE, IOWA
From 23-JUN-00 12:00:00 to 23-JUN-00 12:00:00 (CST)
Location: GEORGETOWN
Magnitude: 52 E
Property damage: 3K
Reported by: GENERAL PUBLIC

Thunderstorm Wind in APPANOOSE, IOWA
From 23-JUN-00 13:45:00 to 23-JUN-00 13:45:00 (CST)
Location: PLANO
Magnitude: 56 E
Property damage: 10K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAYNE, IOWA
From 23-JUN-00 13:40:00 to 23-JUN-00 13:40:00 (CST)
Location: PROMISE CITY
Magnitude: 61 E
Property damage: 20K
Crop damage: 2K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAYNE, IOWA
From 23-JUN-00 13:30:00 to 23-JUN-00 13:30:00 (CST)
Location: CORYDON
Magnitude: 61 E
Property damage: 20K
Crop damage: 2K
Reported by: LAW ENFORCEMENT

Hail in WARREN, IOWA
From 23-JUN-00 10:20:00 to 23-JUN-00 10:20:00 (CST)
Location: ST MARYS
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in APPANOOSE, IOWA
From 23-JUN-00 13:55:00 to 23-JUN-00 13:55:00 (CST)
Location: UNIONVILLE
Magnitude: 56 E
Property damage: 10K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Tornado in WAYNE, IOWA
From 23-JUN-00 13:18:00 to 23-JUN-00 13:18:00 (CST)
Location: CORYDON
Tornado F-scale: F0
Property damage: 1K
Reported by: LAW ENFORCEMENT

Brief touchdown

Thunderstorm Wind in WARREN, IOWA
From 23-JUN-00 10:23:00 to 23-JUN-00 10:23:00 (CST)
Location: NORWALK
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in APPANOOSE, IOWA
From 23-JUN-00 13:50:00 to 23-JUN-00 13:50:00 (CST)
Location: MOULTON
Magnitude: 56 E
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in DECATUR, IOWA
From 23-JUN-00 12:45:00 to 23-JUN-00 12:45:00 (CST)
Location: DAVIS CITY
Magnitude: 56 E
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in LUCAS, IOWA
From 23-JUN-00 13:00:00 to 23-JUN-00 13:00:00 (CST)
Location: CHARITON
Magnitude: 61 E
Property damage: 50K
Crop damage: 5K
Reported by: NEWSPAPER

Thunderstorm Wind in MADISON, IOWA
From 23-JUN-00 10:07:00 to 23-JUN-00 10:07:00 (CST)
Location: WINTERSET
Magnitude: 56 E
Property damage: 25K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 23-JUN-00 10:15:00 to 23-JUN-00 10:15:00 (CST)
Location: ST MARYS
Magnitude: 61 E
Property damage: 10K
Crop damage: 1K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in DECATUR, IOWA
From 23-JUN-00 12:31:00 to 23-JUN-00 12:31:00 (CST)
Location: LAMONI ARPT
Magnitude: 63 M
Property damage: 5K
Crop damage: 1K
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in WARREN, IOWA
From 23-JUN-00 10:35:00 to 23-JUN-00 10:35:00 (CST)
Location: INDIANOLA
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 23-JUN-00 10:38:00 to 23-JUN-00 10:38:00 (CST)
Location: INDIANOLA
Magnitude: 95 M
Property damage: 75K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Microburst event

Thunderstorm Wind in DECATUR, IOWA
From 23-JUN-00 12:45:00 to 23-JUN-00 12:45:00 (CST)
Location: LAMONI
Magnitude: 61 E
Property damage: 10K
Crop damage: 1K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WARREN, IOWA
From 23-JUN-00 10:39:00 to 23-JUN-00 10:39:00 (CST)
Location: CARLISLE
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MAHASKA, IOWA
From 23-JUN-00 12:25:00 to 23-JUN-00 12:25:00 (CST)
Location: OSKALOOSA
Magnitude: 52 E
Property damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DAVIS, IOWA
From 23-JUN-00 13:55:00 to 23-JUN-00 13:55:00 (CST)
Location: WEST GROVE
Magnitude: 56 E
Property damage: 10K
Crop damage: 1K
Reported by: LAW ENFORCEMENT