Once again, very warm and humid air spread over Iowa with temperatures in the 80s to mid 90s during the afternoon of the 13th.  The airmass was again very capped with 700 mb temperatures of 12 degrees C. or higher over most of the area.  As a result, thunderstorms had a hard time developing.  Once the thunderstorms did develop they became severe quite quickly.  There was one tornado reported during the early part of the thunderstorm development.  A brief touchdown occurred southeast of Ayrshire in Palo Alto County.  No significant damage was reported with this tornado.  The main severe weather feature with these storms was hail, though there were several reports of high winds as well.  The big story was hail of an inch or more in diameter, with frequent reports of hail up to golf ball in size.  Considerable crop damage was reported with soybeans being hard hit.  Some reports indicate up to 50% of the soybean pots cracked open by the hail.  Golf ball size hail war reported ankle deep east of Ellsworth in Hamilton County.  Hail fell for a 30 minute period in Wright County at Eagle Grove.  High winds also caused tree, power line, and crop damage.   Trees were toppled in several locations by winds of 60 to 70 MPH.  The winds also caused considerable lodging of the corn crop due in part to stalk rot brought about by the very dry weather.  The down of Duncombe in Webster County was hard hit with considerable roof damage reported there.

Thunderstorm Wind in HUMBOLDT, IOWA
From 13-SEP-00 20:12:00 to 13-SEP-00 20:12:00 (CST)
Location: LIVERMORE
Magnitude: 52 E
Property damage: 3K
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in HUMBOLDT, IOWA
From 13-SEP-00 19:50:00 to 13-SEP-00 19:50:00 (CST)
Location: LIVERMORE
Magnitude: 52 E
Property damage: 2K
Crop damage: 3K
Reported by: TRAINED SPOTTER

Hail in WRIGHT, IOWA
From 13-SEP-00 20:30:00 to 13-SEP-00 20:30:00 (CST)
Location: EAGLE GROVE
Magnitude: 1.50 
Property damage: 25K
Crop damage: 20K
Reported by: BROADCAST MEDIA

Hail in HAMILTON, IOWA
From 13-SEP-00 21:15:00 to 13-SEP-00 21:45:00 (CST)
Location: KAMRAR
Magnitude: 0.75 
Crop damage: 5K
Reported by: GENERAL PUBLIC

Hail in WRIGHT, IOWA
From 13-SEP-00 21:15:00 to 13-SEP-00 21:15:00 (CST)
Location: EAGLE GROVE
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: GENERAL PUBLIC

Hail in HAMILTON, IOWA
From 13-SEP-00 21:08:00 to 13-SEP-00 21:08:00 (CST)
Location: KAMRAR
Magnitude: 1.75 
Property damage: 30K
Crop damage: 25K
Reported by: LAW ENFORCEMENT

Hail in HAMILTON, IOWA
From 13-SEP-00 21:25:00 to 13-SEP-00 21:25:00 (CST)
Location: ELLSWORTH
Magnitude: 1.75 
Property damage: 50K
Crop damage: 100K
Reported by: GENERAL PUBLIC

Hail in PALO ALTO, IOWA
From 13-SEP-00 19:27:00 to 13-SEP-00 19:27:00 (CST)
Location: AYRSHIRE
Magnitude: 1.75 
Property damage: 10K
Crop damage: 20K
Reported by: BROADCAST MEDIA

Hail in HARDIN, IOWA
From 13-SEP-00 21:29:00 to 13-SEP-00 21:29:00 (CST)
Location: RADCLIFFE
Magnitude: 1.75 
Property damage: 30K
Crop damage: 30K
Reported by: TRAINED SPOTTER

Hail in WRIGHT, IOWA
From 13-SEP-00 20:20:00 to 13-SEP-00 20:20:00 (CST)
Location: GOLDFIELD
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Hail in HAMILTON, IOWA
From 13-SEP-00 21:10:00 to 13-SEP-00 21:10:00 (CST)
Location: KAMRAR
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Tornado in PALO ALTO, IOWA
From 13-SEP-00 19:30:00 to 13-SEP-00 19:30:00 (CST)
Location: AYRSHIRE
Tornado F-scale: F0
Crop damage: 3K
Reported by: EMERGENCY MANAGER

Brief touchdown

Thunderstorm Wind in WEBSTER, IOWA
From 13-SEP-00 20:30:00 to 13-SEP-00 20:30:00 (CST)
Location: DUNCOMBE
Magnitude: 65 E
Property damage: 50K
Crop damage: 25K
Reported by: GENERAL PUBLIC

Hail in HAMILTON, IOWA
From 13-SEP-00 21:13:00 to 13-SEP-00 21:13:00 (CST)
Location: ELLSWORTH
Magnitude: 1.75 
Property damage: 40K
Crop damage: 25K
Reported by: GENERAL PUBLIC

Hail in HAMILTON, IOWA
From 13-SEP-00 20:58:00 to 13-SEP-00 20:58:00 (CST)
Location: WEBSTER CITY
Magnitude: 1.00 
Property damage: 10K
Crop damage: 10K
Reported by: BROADCAST MEDIA

Hail in HAMILTON, IOWA
From 13-SEP-00 21:05:00 to 13-SEP-00 21:05:00 (CST)
Location: KAMRAR
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Hail in HAMILTON, IOWA
From 13-SEP-00 21:25:00 to 13-SEP-00 21:25:00 (CST)
Location: ELLSWORTH
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: GENERAL PUBLIC

Hail in HAMILTON, IOWA
From 13-SEP-00 20:45:00 to 13-SEP-00 20:45:00 (CST)
Location: WEBSTER CITY
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: LAW ENFORCEMENT

Hail in HAMILTON, IOWA
From 13-SEP-00 20:55:00 to 13-SEP-00 20:55:00 (CST)
Location: WEBSTER CITY
Magnitude: 1.75 
Property damage: 40K
Crop damage: 25K
Reported by: AMATEUR RADIO

Hail in HARDIN, IOWA
From 13-SEP-00 21:25:00 to 13-SEP-00 21:25:00 (CST)
Location: RADCLIFFE
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in HAMILTON, IOWA
From 13-SEP-00 20:40:00 to 13-SEP-00 20:40:00 (CST)
Location: WEBSTER CITY
Magnitude: 52 E
Property damage: 3K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in HUMBOLDT, IOWA
From 13-SEP-00 19:50:00 to 13-SEP-00 19:50:00 (CST)
Location: BODE
Magnitude: 56 E
Property damage: 10K
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in WRIGHT, IOWA
From 13-SEP-00 20:05:00 to 13-SEP-00 20:05:00 (CST)
Location: HOLMES
Magnitude: 52 E
Property damage: 3K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WEBSTER, IOWA
From 13-SEP-00 20:45:00 to 13-SEP-00 20:45:00 (CST)
Location: DUNCOMBE
Magnitude: 52 E
Property damage: 3K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in KOSSUTH, IOWA
From 13-SEP-00 19:45:00 to 13-SEP-00 19:45:00 (CST)
Location: ALGONA
Magnitude: 1.00 
Property damage: 3K
Crop damage: 10K
Reported by: TRAINED SPOTTER