Two rounds of severe weather affected parts of south-central and southeast Wisconsin on June 23rd, with the second round featuring 8 tornadoes, large hail (up to golf-ball size), and powerful straight-line downburst winds.  A warm front moving north through the area resulted in favorable vertical wind shear to allow for supercell development.The 1st round of severe weather was due to a broken line of intense thunderstorms moving  across Walworth, Milwaukee, Racine and Kenosha counties.  Hail of up to 1 inch in diameter and torrential rainfall accompanied these storms before they moved over Lake Michigan and weakened.  The 2nd round of severe weather was dominated by 2 cyclic supercells - one moved east/southeast through Marquette, Green Lake, Fond du Lac, and Washington Counties, spinning up 5 separate tornadoes, dumping hail stones up to 3 inches in diameter, and hurricane-force downburst winds.  The large hail dented several vehicles.  Two of these were rated F3.  Refer to the individual tornado reports for more details.  A more southerly supercell tracked across extreme southern Sauk County and then made a partial right turn and headed southeast through Dane County, spinning up 2 tornadoes in the process, as well as large hail and downburst winds.  One powerful downburst wind in Madison (Dane Co.) blew equipment off the roof of a business at the Midvale Shopping Mall.  A semi southwest of Ft. Atkinson was blown over by straight-line wind gusts.  This southern supercell eventually spun up another tornado in south-central Jefferson County which moved into north-central Walworth County.  Refer to the individual tornado reports for more details.Both supercells had downbursts that generated large hail and powerful, hurricane-force winds north and south of their tracks.  Over all of Wisconsin, 16 tornadoes were documented on June 23rd, which is the 4th highest single-day total (record is 24 on May 8, 1988).  For south-central and southeast Wisconsin, the 8 tornadoes on June 23rd was tied for the 4th highest single-day total (record is 11 on May 8, 1988).

Tornado in WALWORTH, WISCONSIN
From 23-JUN-04 20:33:00 to 23-JUN-04 20:34:00 (CST)
Location: WHITEWATER
Tornado F-scale: F1
Property damage: 5K
Reported by: NWS STORM SURVEY

This tornado is a continuation of the Jefferson County tornado.  Once it crossed the Jefferson/Walworth County line about 7 miles east-northeast of Whitewater, or about 1 mile west of CTH H, this tornado continued east-southeast and dissipated a short time later 3 miles north-northwest of La Grange.  Only tree damage was noted.  Average path width was about 100 yards.

Funnel Cloud in SHEBOYGAN, WISCONSIN
From 23-JUN-04 20:40:00 to 23-JUN-04 20:40:00 (CST)
Location: HINGHAM
Reported by: TRAINED SPOTTER

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 23-JUN-04 20:45:00 to 23-JUN-04 20:45:00 (CST)
Location: WAUBEKA
Magnitude: 56 EG
Reported by: EMERGENCY MANAGER

Funnel Cloud in OZAUKEE, WISCONSIN
From 23-JUN-04 20:59:00 to 23-JUN-04 20:59:00 (CST)
Location: THIENSVILLE
Reported by: TRAINED SPOTTER

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 23-JUN-04 20:59:00 to 23-JUN-04 20:59:00 (CST)
Location: THIENSVILLE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Hail in OZAUKEE, WISCONSIN
From 23-JUN-04 20:59:00 to 23-JUN-04 20:59:00 (CST)
Location: THIENSVILLE
Magnitude: 3.00 
Property damage: 50K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 23-JUN-04 21:30:00 to 23-JUN-04 21:30:00 (CST)
Location: NEW BERLIN
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Hail in MILWAUKEE, WISCONSIN
From 23-JUN-04 20:35:00 to 23-JUN-04 20:35:00 (CST)
Location: MILWAUKEE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Tornado in MARQUETTE, WISCONSIN
From 23-JUN-04 19:00:00 to 23-JUN-04 19:15:00 (CST)
Location: PACKWAUKEE
Tornado F-scale: F2
Property damage: 1M
Crop damage: 500K
Reported by: NWS STORM SURVEY

A strong tornado spun up about a half-mile east of Interstate 39/STH 51, near the intersection of Fawn Ct. and CTH M, or 3.5 NNW of Packwaukee.  This tornado increased to F2 strength (estimated 140-150 mph) as it tore east/southeast through the southern part of Montello.  Numerous trees were uprooted.  Four homes were destroyed, 25 sustained major damage, and 142 had minor damage.  In addition, 9 agricultural buildings were damaged or destroyed.   The tornado ended in a swampy, Fox River bottom-land  area about 4 miles southeast of Montello (1 mile short of the county line and south of CTH C and east STH 22).  The responsible supercell also spun up a different tornado earlier in Adams County.  Prop damage estimated at $1.0 M.  Average path width was about 175 yards.

Tornado in WASHINGTON, WISCONSIN
From 23-JUN-04 20:19:00 to 23-JUN-04 20:19:00 (CST)
Location: JACKSON
Tornado F-scale: F0
Reported by: AMATEUR RADIO

A very brief F0 tornado (50-60 mph) spun up 4 miles north-northeast of Jackson in an open rural area just north of STH 143 and east of CTH G, or 0.6 miles northwest of Keowns.  The tornado traveled southeast 0.1 miles and dissipated.  No damage was reported.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 23-JUN-04 20:38:00 to 23-JUN-04 20:38:00 (CST)
Location: EAGLE
Magnitude: 56 EG
Reported by: NWS STORM SURVEY

Thunderstorm Wind in WALWORTH, WISCONSIN
From 23-JUN-04 20:25:00 to 23-JUN-04 20:40:00 (CST)
Location: WHITEWATER
Magnitude: 56 EG
Reported by: NWS STORM SURVEY

Tornado in JEFFERSON, WISCONSIN
From 23-JUN-04 20:23:00 to 23-JUN-04 20:33:00 (CST)
Location: COLD SPG
Tornado F-scale: F1
Property damage: 150K
Reported by: EMERGENCY MANAGER

A weak F1 tornado (90-100 mph) spun up 1.8 miles east-southeast of Cold Springs and traveled east-southeast to the Jefferson/Walworth County line about 3.2 miles southwest of Palmyra.  Shortly after it spun up this tornado destroyed a garage, one vehicle, a wind mill, and hay wagon.   Later on, severely damaged a pole shed, damaged a couple vehicles, and suck a fair amount of insulation into a relatively new home that had closed windows and doors.  Otherwise, many trees were uprooted or twisted.  Average path width was about 125 yards.

Thunderstorm Wind in RACINE, WISCONSIN
From 23-JUN-04 20:55:00 to 23-JUN-04 21:08:00 (CST)
Location: NORTH CAPE
Magnitude: 69 MG
Reported by: TRAINED SPOTTER

Tornado in DANE, WISCONSIN
From 23-JUN-04 19:35:00 to 23-JUN-04 19:44:00 (CST)
Location: MIDDLETON
Tornado F-scale: F1
Property damage: 1.49M
Reported by: NWS STORM SURVEY

A weak F1 tornado (100-110 mph) spun up just west of the southwest Beltline at a point 2.5 miles SW of Middleton (half-mile north of intersection of CTH S and Pleasant View Rd.).  It moved east-southeast across the West Town Mall, through the UW-Madison Research Park, ultimately ending about 1/3 mile east of STH 151/Park St (2.3 miles south of Capitol Square).  In the Research Park many windows were blown out of business offices, and damage was inflicted to UW-MSN agricultural buildings.  At least 194 residential homes had minor damage (roof/siding), and 11 had major damage (windows/roofs - total of $410K).  At least 8 businesses had minor damage, and 1 had major damage (roof partially torn off and 1 wall damaged).  Total business damage was about $246K.  The UW-Madison Research Park had about $729K in damage.  Many vehicles sustained some degree of damage ($100K), and one semi was blown over.  At least 1000 large trees were damaged.  Estimated total tornado damage is $1.485M.  An additional cleanup cost of about $347K was reported. At least 2000 customers lost their electrical power.  Average path width was about 150 yards.

Hail in DANE, WISCONSIN
From 23-JUN-04 19:45:00 to 23-JUN-04 19:45:00 (CST)
Location: MADISON
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in DANE, WISCONSIN
From 23-JUN-04 19:30:00 to 23-JUN-04 19:30:00 (CST)
Location: MIDDLETON
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Funnel Cloud in GREEN LAKE, WISCONSIN
From 23-JUN-04 19:24:00 to 23-JUN-04 19:24:00 (CST)
Location: KINGSTON
Reported by: TRAINED SPOTTER

Hail in FOND DU LAC, WISCONSIN
From 23-JUN-04 19:42:00 to 23-JUN-04 19:42:00 (CST)
Location: ALTO
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DODGE, WISCONSIN
From 23-JUN-04 19:40:00 to 23-JUN-04 19:45:00 (CST)
Location: SOUTH BEAVER DAM
Magnitude: 52 EG
Reported by: GENERAL PUBLIC

Tornado in DODGE, WISCONSIN
From 23-JUN-04 19:50:00 to 23-JUN-04 20:05:00 (CST)
Location: WAUPUN
Tornado F-scale: F3
Property damage: 8M
Crop damage: 500K
Reported by: NWS STORM SURVEY

This tornado was a continuation of the tornado that moved east-southeast from Markesan (Green Lake Co.) through the southwest corner of Fond du Lac County (civil Town of Alto).  In Dodge County it maintained its F3 strength (175-200 mph) as it moved east-southeast through the city of Waupun and through rural areas of northern Dodge County to a point 2 miles southeast of Lomira, where it dissipated just west of U.S. Highway 41.  Many homes and vehicles in the Dodge County portion of Waupun were damaged. Toward Lomira, several dozens of agricultural buildings and homes were damage.  Numerous trees were uprooted from Waupun to near Lomira, and some crop damage was noted.  Estimated damage in Waupun was about $3M, and $2.5M in the civil Towns of Lomira and Le Roy.  Average path width was about 300 yards.

Thunderstorm Wind in DODGE, WISCONSIN
From 23-JUN-04 19:58:00 to 23-JUN-04 20:00:00 (CST)
Location: FARMERSVILLE
Magnitude: 56 EG
Reported by: NWS STORM SURVEY

Tornado in FOND DU LAC, WISCONSIN
From 23-JUN-04 19:42:00 to 23-JUN-04 19:50:00 (CST)
Location: ALTO
Tornado F-scale: F3
Property damage: 6M
Crop damage: 700K
Reported by: LAW ENFORCEMENT

This tornado was a continuation of the tornado that moved through the southern part of the city of Markesan (Green Lake Co.).  It entered Fond du Lac County just south of Lake Maria Road, about 4.7 miles SW of Alto.  It moved east-southeast on a line toward Waupun at F3 strength (estimated 175-200 mph), and actually merged with the Lake Maria tornado that moved east out of extreme southeastern Green Lake County.  The merger took place just east of a dogleg/bend of Oak Grove Rd., about 2.2 miles SSW of Alto.  The civil Town of Alto reported that 19 residential homes had major damage and 1 was destroyed.  One business had major damage.  Fourteen farms were affected with a tally of 8 ag-buildings/homes with minor damage, 19 with major damage, and 16 destroyed.  Crop damage was severe.  Public sector damage (roads/bridges) was about $225K.  In the city of Waupun (Fond du Lac side), 4 homes had major damage, and roughly 150 had minor roof/siding damage due to severe tree damage.  Average path width was about 300 yards.

Tornado in FOND DU LAC, WISCONSIN
From 23-JUN-04 19:42:00 to 23-JUN-04 19:45:00 (CST)
Location: ALTO
Tornado F-scale: F3
Property damage: 1.61M
Crop damage: 300K
Reported by: NWS STORM SURVEY

This tornado was a continuation of the tornado that moved east from the Lake Maria area of extreme southeastern Green Lake County. It maintained its F3 strength (175-200 mph) and moved east along Marshview Rd, only to merge with the F3 tornado moving east/southeast out of the Markesan area of southeast Green Lake County.  The merger took place just east of a dogleg/bend of Oak Grove Rd., about 2.2 miles SSW of Alto.  The civil Town of Alto reported that 8 residential homes had major damage.  Four farms were affected with a tally of 8 ag-buildings/homes with minor damage, 19 with  major damage, and 16 destroyed.  Crop damage was severe.  Public sector damage (roads/bridges) was about $100K. Average path width was about 275 yards.

Thunderstorm Wind in WASHINGTON, WISCONSIN
From 23-JUN-04 20:52:00 to 23-JUN-04 20:52:00 (CST)
Location: FILLMORE
Magnitude: 52 EG
Reported by: AMATEUR RADIO

Hail in OZAUKEE, WISCONSIN
From 23-JUN-04 20:28:00 to 23-JUN-04 20:28:00 (CST)
Location: SAUKVILLE
Magnitude: 0.75 
Reported by: AMATEUR RADIO

Thunderstorm Wind in SAUK, WISCONSIN
From 23-JUN-04 19:00:00 to 23-JUN-04 19:00:00 (CST)
Location: LA VALLE
Magnitude: 61 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 23-JUN-04 18:55:00 to 23-JUN-04 18:55:00 (CST)
Location: OXFORD
Magnitude: 57 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 23-JUN-04 20:00:00 to 23-JUN-04 20:00:00 (CST)
Location: OAK CENTER
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Tornado in GREEN LAKE, WISCONSIN
From 23-JUN-04 19:35:00 to 23-JUN-04 19:42:00 (CST)
Location: MARKESAN
Tornado F-scale: F3
Property damage: 675K
Crop damage: 300K
Reported by: NWS STORM SURVEY

A strong tornado spun up about a mile directly east of Lake Maria in southeastern Green Lake County, or about 4.2 miles SSE of Markesan, moved east along Sunny Drive with F3 strength (estimated 175-200), and exited Green Lake County along Mielke Rd., or about 6.8 miles SE of Markesan.  Numerous trees were uprooted.   At least 8 homes or ag-buildings had minor damage, at least 5 homes or ag-buildings had major damage, and at least 5 homes or ag-buildings were destroyed.  Near the intersection of Sunny Drive and Pleasant Drive, two people and most basement items were "sucked" out of their home's basement while the home was being destroyed.  The husband was found dead and his wife was critically injured.  Average path width was about 275 yards.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 23-JUN-04 19:47:00 to 23-JUN-04 19:47:00 (CST)
Location: FRIESLAND
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 23-JUN-04 19:50:00 to 23-JUN-04 19:50:00 (CST)
Location: OTSEGO
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 23-JUN-04 19:35:00 to 23-JUN-04 19:40:00 (CST)
Location: WYOCENA
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

Tornado in WASHINGTON, WISCONSIN
From 23-JUN-04 20:15:00 to 23-JUN-04 20:18:00 (CST)
Location: KEWASKUM
Tornado F-scale: F1
Property damage: 10K
Crop damage: 50K
Reported by: EMERGENCY MANAGER

This tornado (80-90 mph) was a continuation of the tornado that moved east-southeast from the area southwest of Campbellsport in southern Fond du Lac County.  Originally this tornado was rated as F1 in Fond du Lac County, but after crossing the Washington/Fond du Lac County line  near the intersection of Lake Bernice Dr. and St. Kilian Dr. it weakened to F0 status.  It finally dissipated 1.5 miles northwest of Kewaskum, north of STH 28 and west of STH 45.  Mainly light tree and crop damage was noted.  Average path width was about 100 yards.

Hail in JEFFERSON, WISCONSIN
From 23-JUN-04 20:01:00 to 23-JUN-04 20:01:00 (CST)
Location: CAMBRIDGE
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DANE, WISCONSIN
From 23-JUN-04 20:53:00 to 23-JUN-04 20:53:00 (CST)
Location: OREGON
Magnitude: 65 EG
Reported by: AMATEUR RADIO

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 23-JUN-04 20:15:00 to 23-JUN-04 20:20:00 (CST)
Location: FT ATKINSON
Magnitude: 80 EG
Reported by: NWS STORM SURVEY

Hail in JEFFERSON, WISCONSIN
From 23-JUN-04 20:15:00 to 23-JUN-04 20:15:00 (CST)
Location: FT ATKINSON
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Hail in JEFFERSON, WISCONSIN
From 23-JUN-04 20:21:00 to 23-JUN-04 20:21:00 (CST)
Location: FT ATKINSON
Magnitude: 1.75 
Property damage: 10K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in SHEBOYGAN, WISCONSIN
From 23-JUN-04 20:25:00 to 23-JUN-04 20:25:00 (CST)
Location: BEECHWOOD
Magnitude: 61 EG
Reported by: TRAINED SPOTTER

Hail in WASHINGTON, WISCONSIN
From 23-JUN-04 20:19:00 to 23-JUN-04 20:19:00 (CST)
Location: WEST BEND
Magnitude: 1.00 
Reported by: AMATEUR RADIO

Tornado in FOND DU LAC, WISCONSIN
From 23-JUN-04 20:10:00 to 23-JUN-04 20:15:00 (CST)
Location: CAMPBELLSPORT
Tornado F-scale: F1
Property damage: 100K
Crop damage: 200K
Reported by: FIRE DEPT/RESCUE SQUAD

A weak F1 tornado (90-100 mph) spun up about 6 miles southwest of Campbellsport in southern Fond du Lac County, at a point ½ mile east of the Dodge County line on Superior Drive.  It tracked east-southeast to 4 miles south-southwest of Campbellsport and moved into Washington County where Lake Bernice Dr. intersects with ST. Kilian Dr.  Mainly moderate tree and crop damage was noted, but one pole shed was destroyed.  Average path width was about 125 yards.

Tornado in GREEN LAKE, WISCONSIN
From 23-JUN-04 19:33:00 to 23-JUN-04 19:42:00 (CST)
Location: MANCHESTER
Tornado F-scale: F3
Property damage: 1.41M
Crop damage: 500K
Reported by: NWS STORM SURVEY

A strong tornado spun up near the intersection of STH 73 and CTH H, about 2 miles north of the village of Manchester.  It increased its strength to F3 (estimated 175-200 mph) as it moved southeast across the southern part of the city of Markesan.  Numerous trees were uprooted.  At least 18 homes or ag-buildings had minor damage, at least 9 homes or ag-buildings had major damage, and at least 21 homes or ag-buildings were destroyed.  This tornado exited Green Lake County at a point 6.4 miles southeast of Markesan, just south of Lake Maria Rd., and continued southeast through Fond du Lac County.  The responsible supercell also spun up different tornadoes earlier in Adams and Marquette Counties. Newspaper headline: "A Day Like No Other."  Average path width was about 350 yards.

Hail in RACINE, WISCONSIN
From 23-JUN-04 16:05:00 to 23-JUN-04 16:15:00 (CST)
Location: RACINE
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Hail in RACINE, WISCONSIN
From 23-JUN-04 15:50:00 to 23-JUN-04 15:50:00 (CST)
Location: UNION GROVE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in RACINE, WISCONSIN
From 23-JUN-04 16:05:00 to 23-JUN-04 16:10:00 (CST)
Location: RACINE
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Hail in MILWAUKEE, WISCONSIN
From 23-JUN-04 15:25:00 to 23-JUN-04 15:30:00 (CST)
Location: HALES CORNERS
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Hail in FOND DU LAC, WISCONSIN
From 23-JUN-04 19:40:00 to 23-JUN-04 19:40:00 (CST)
Location: ALTO
Magnitude: 1.75 
Property damage: 3K
Reported by: NEWSPAPER

Hail in DODGE, WISCONSIN
From 23-JUN-04 19:45:00 to 23-JUN-04 19:45:00 (CST)
Location: WAUPUN
Magnitude: 1.75 
Property damage: 3K
Reported by: NEWSPAPER

Tornado in DANE, WISCONSIN
From 23-JUN-04 19:23:00 to 23-JUN-04 19:23:00 (CST)
Location: MARXVILLE
Tornado F-scale: F0
Property damage: 3K
Reported by: NEWSPAPER

A brief tornado spun up along Old Settlers Rd., just south of the Township line (or about 0.2 mile south of of the intersection of Old Settlers Rd. and Katzenbuechel Rd.).  One home had a couple windows damaged by flying debris, and several large trees were uprooted or twisted/sheared on a couple properties.  The typical sequence of events was observed by the home's owner's - heavy rain and some wind, then calm, then the freight-train noise, and they could barely close the front door.  The responsible supercell moved southeast toward Madison and eventually spun up another tornado on the southwest side of Madison.

Thunderstorm Wind in DANE, WISCONSIN
From 23-JUN-04 19:40:00 to 23-JUN-04 19:40:00 (CST)
Location: MADISON
Magnitude: 65 EG
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in DODGE, WISCONSIN
From 23-JUN-04 20:00:00 to 23-JUN-04 20:00:00 (CST)
Location: JUNEAU
Magnitude: 56 EG
Property damage: 3K
Reported by: NEWSPAPER

Thunderstorm Wind in RACINE, WISCONSIN
From 23-JUN-04 21:06:00 to 23-JUN-04 21:06:00 (CST)
Location: RACINE
Magnitude: 52 EG
Reported by: NEWSPAPER

Hail in MARQUETTE, WISCONSIN
From 23-JUN-04 19:05:00 to 23-JUN-04 19:05:00 (CST)
Location: MONTELLO
Magnitude: 1.75 
Property damage: 2K
Reported by: NEWSPAPER

Hail in GREEN LAKE, WISCONSIN
From 23-JUN-04 19:30:00 to 23-JUN-04 19:30:00 (CST)
Location: MARKESAN
Magnitude: 1.75 
Property damage: 2K
Reported by: NEWSPAPER

Hail in RACINE, WISCONSIN
From 23-JUN-04 21:08:00 to 23-JUN-04 21:12:00 (CST)
Location: NORTH BAY
Magnitude: 1.00 
Reported by: TRAINED SPOTTER