Moist and unstable air along a stalled frontal boundary set the stage for supercell thunderstorm development during the afternoon and evening hours.  This was round number two for the day.  Numerous supercells developed across southern Wisconsin by the late afternoon hours, which produced three tornadoes, numerous funnel clouds, several large hail reports, and heavy rains.  Funnel cloud reports were collected from Columbia, Dane, Rock, Dodge, and Waukesha counties between 1720 CST and 1913 CST.  The first tornado spun up 3.3 miles east-southeast of Stoughton (Dane Co.), the second tornado spun up 1.2 miles southeast of De Forest (Dane Co.), and the third tornado spun up 2 miles southwest of Fall River (Columbia Co.).  All three tornadoes had no damage associated with them and were all classified as F0s (for detailed path lengths, path widths, and spin up and dissipating points, please consult details above).  In addition to tornadoes, funnel clouds, and large hail, these storms produced heavy rain.  Urban flooding resulted across Ozaukee County after storms produced 1.25 inches of rain in only a 30 minute period.  A few roads were closed and gravel washouts were common.  Refer to several flood and flash flood events for May 23rd, 24th, and 25th, for related information.

Funnel Cloud in ROCK, WISCONSIN
From 23-MAY-04 17:44:00 to 23-MAY-04 17:44:00 (CST)
Location: EVANSVILLE
Reported by: AMATEUR RADIO

Funnel Cloud in WAUKESHA, WISCONSIN
From 23-MAY-04 19:13:00 to 23-MAY-04 19:13:00 (CST)
Location: MENOMONEE FALLS
Reported by: GENERAL PUBLIC

Tornado in DANE, WISCONSIN
From 23-MAY-04 17:59:00 to 23-MAY-04 18:04:00 (CST)
Location: DE FOREST
Tornado F-scale: F0
Reported by: NWS STORM SURVEY

A tornado spun up 1.2 miles southeast of DeForest  (Dane Co.) around 1759 CST, and dissipated around 1804 CST, 1.9 miles east of De Forest (Dane Co.).  Specifically, it spun up just northeast of the intersection of STH 51 and Vinburn Rd. and ended about 0.1 mile southwest of the intersection of Mueller Rd. and Portage Rd.  The tornado's path was 1.3 miles long and 25 yards wide.  No damage was reported and this tornado was determined to be an F0.  Average width was about 25 yards.

Funnel Cloud in DODGE, WISCONSIN
From 23-MAY-04 18:55:00 to 23-MAY-04 18:55:00 (CST)
Location: SOUTH BEAVER DAM
Reported by: LAW ENFORCEMENT

Tornado in DANE, WISCONSIN
From 23-MAY-04 17:55:00 to 23-MAY-04 17:56:00 (CST)
Location: STOUGHTON
Tornado F-scale: F0
Reported by: NWS STORM SURVEY

An advanced spotter videotaped a tornado that briefly spun up at 1755 CST, 3.3 miles east-southeast of Stoughton (Dane Co.), and dissipated at 1756 CST, 3.8 miles west-northwest of Albion (Dane Co.).  The tornado's path was only a mile long and the width was about 25 yards.  No damage was reported and this tornado was deemed an F0.  The average path width was about 25 yards.

Funnel Cloud in WAUKESHA, WISCONSIN
From 23-MAY-04 19:07:00 to 23-MAY-04 19:07:00 (CST)
Location: DELAFIELD
Reported by: AMATEUR RADIO

Hail in DODGE, WISCONSIN
From 23-MAY-04 18:59:00 to 23-MAY-04 18:59:00 (CST)
Location: KEKOSKEE
Magnitude: 1.00 
Reported by: LAW ENFORCEMENT

Hail in OZAUKEE, WISCONSIN
From 23-MAY-04 19:43:00 to 23-MAY-04 19:43:00 (CST)
Location: PORT WASHINGTON
Magnitude: 1.50 
Reported by: TRAINED SPOTTER

Hail in WAUKESHA, WISCONSIN
From 23-MAY-04 18:53:00 to 23-MAY-04 18:53:00 (CST)
Location: OCONOMOWOC
Magnitude: 0.88 
Reported by: NWS EMPLOYEE(OFF DUTY)

Heavy Rain in OZAUKEE, WISCONSIN
From 23-MAY-04 19:00:00 to 23-MAY-04 20:30:00 (CST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

Hail in WAUKESHA, WISCONSIN
From 23-MAY-04 18:24:00 to 23-MAY-04 18:24:00 (CST)
Location: DELAFIELD
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Funnel Cloud in DANE, WISCONSIN
From 23-MAY-04 17:53:00 to 23-MAY-04 17:53:00 (CST)
Location: MADISON
Reported by: BROADCAST MEDIA

Hail in OZAUKEE, WISCONSIN
From 23-MAY-04 19:43:00 to 23-MAY-04 19:43:00 (CST)
Location: MEQUON
Magnitude: 1.50 
Reported by: AMATEUR RADIO

Hail in WAUKESHA, WISCONSIN
From 23-MAY-04 19:35:00 to 23-MAY-04 19:35:00 (CST)
Location: MENOMONEE FALLS
Magnitude: 1.00 
Reported by: GENERAL PUBLIC

Hail in DODGE, WISCONSIN
From 23-MAY-04 18:52:00 to 23-MAY-04 18:52:00 (CST)
Location: BEAVER DAM
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Funnel Cloud in DODGE, WISCONSIN
From 23-MAY-04 18:13:00 to 23-MAY-04 18:13:00 (CST)
Location: REESEVILLE
Reported by: LAW ENFORCEMENT

Hail in DANE, WISCONSIN
From 23-MAY-04 18:00:00 to 23-MAY-04 18:00:00 (CST)
Location: ALBION
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in JEFFERSON, WISCONSIN
From 23-MAY-04 18:20:00 to 23-MAY-04 18:20:00 (CST)
Location: JEFFERSON
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in SHEBOYGAN, WISCONSIN
From 23-MAY-04 19:55:00 to 23-MAY-04 19:55:00 (CST)
Location: PLYMOUTH
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in SHEBOYGAN, WISCONSIN
From 23-MAY-04 19:39:00 to 23-MAY-04 19:41:00 (CST)
Location: CASCADE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in MILWAUKEE, WISCONSIN
From 23-MAY-04 19:41:00 to 23-MAY-04 19:41:00 (CST)
Location: BROWN DEER
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in MILWAUKEE, WISCONSIN
From 23-MAY-04 19:48:00 to 23-MAY-04 19:48:00 (CST)
Location: BROWN DEER
Magnitude: 1.50 
Reported by: AMATEUR RADIO

Hail in DANE, WISCONSIN
From 23-MAY-04 17:35:00 to 23-MAY-04 17:35:00 (CST)
Location: STOUGHTON
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Tornado in COLUMBIA, WISCONSIN
From 23-MAY-04 18:25:00 to 23-MAY-04 18:25:00 (CST)
Location: FALL RIVER
Tornado F-scale: F0
Reported by: NWS STORM SURVEY

A tornado spun up very briefly at 1825 CST, 2 miles southwest of Fall River in Columbia County.  A storm survey determined the tornado's path was only a tenth of a mile and the width was about 25 yards.  Its estimated position is about 0.3 mile west-northwest of the intersection of Hall Rd. and Freck Rd.  No damage was reported and it was determined the tornado was an F0.

Funnel Cloud in COLUMBIA, WISCONSIN
From 23-MAY-04 17:20:00 to 23-MAY-04 17:20:00 (CST)
Location: ARLINGTON
Reported by: TRAINED SPOTTER

Hail in OZAUKEE, WISCONSIN
From 23-MAY-04 19:45:00 to 23-MAY-04 19:45:00 (CST)
Location: MEQUON
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Hail in DANE, WISCONSIN
From 23-MAY-04 17:25:00 to 23-MAY-04 17:25:00 (CST)
Location: OREGON
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Hail in JEFFERSON, WISCONSIN
From 23-MAY-04 18:20:00 to 23-MAY-04 18:20:00 (CST)
Location: JOHNSON CREEK
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT