A broken like of thunderstorms developed ahead of a cold front headed into western Wisconsin during the late afternoon hours.  With a moderately unstable airmass and decent directional shear, some storms took on supercellular characteristics.  One such storm produced a tornado in Sauk County, 4.5 miles south-southwest of Devils Lake, just west of STH 12 on the west side of the Badger Army Amo Plant, in the Bluffview area.  The tornado was brief and weak. No significant damage was noted.  The line progressed east across most of southern Wisconsin during the early evening, producing areas of large hail and damaging straight-line winds which uprooted large trees or broke large tree branches out of trees.  In Rock County, scattered large trees were uprooted, which in turn blocked several roads.  About a half-dozen homes were lightly damaged due to trees or tree branches crashing down on them.  Heavy rainfall in the Madison area led to urban-type flooding.  Lightning strikes and/or tree limbs hitting power lines resulted in about 2900 customers losing electrical power, mostly in the Fort Atkinson (Jefferson Co.) and Delafield (Waukesha Co.) areas.

Thunderstorm Wind in DANE, WISCONSIN
From 24-MAY-06 17:41:00 to 24-MAY-06 17:41:00 (CST)
Location: MONONA
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

Trees down.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 24-MAY-06 17:15:00 to 24-MAY-06 17:15:00 (CST)
Location: PORTAGE
Magnitude: 50 EG
Reported by: LAW ENFORCEMENT

Hail in IOWA, WISCONSIN
From 24-MAY-06 16:43:00 to 24-MAY-06 16:43:00 (CST)
Location: DODGEVILLE
Magnitude: 0.88 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 24-MAY-06 18:00:00 to 24-MAY-06 18:00:00 (CST)
Location: FT ATKINSON
Magnitude: 50 EG
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 24-MAY-06 19:00:00 to 24-MAY-06 19:00:00 (CST)
Location: DELAFIELD
Magnitude: 50 EG
Property damage: 10K
Reported by: NEWSPAPER

Lightning in KENOSHA, WISCONSIN
From 24-MAY-06 16:00:00 to 24-MAY-06 16:00:00 (CST)
Location: KENOSHA
Property damage: 1K
Reported by: NEWSPAPER

Lightning struck a garage in the city of Kenosha, resulting in a small fire and slight damage.  The time is only an estimate, it could have been a hour or two earlier.

Tornado in SAUK, WISCONSIN
From 24-MAY-06 16:53:00 to 24-MAY-06 16:53:00 (CST)
Location: DEVILS LAKE
Tornado F-scale: F0
Property damage: 0
Crop damage: 0
Reported by: TRAINED SPOTTER

A brief tornado spun up 4.5 miles southwest of Devils Lake and did no damage.  The tornado was rated an F0.

Thunderstorm Wind in DANE, WISCONSIN
From 24-MAY-06 17:58:00 to 24-MAY-06 17:58:00 (CST)
Location: MONONA
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in SAUK, WISCONSIN
From 24-MAY-06 16:30:00 to 24-MAY-06 17:00:00 (CST)
Location: LOGANVILLE
Magnitude: 50 EG
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DANE, WISCONSIN
From 24-MAY-06 17:20:00 to 24-MAY-06 17:20:00 (CST)
Location: WAUNAKEE
Magnitude: 56 EG
Reported by: AMATEUR RADIO

Heavy Rain in DANE, WISCONSIN
From 24-MAY-06 17:00:00 to 24-MAY-06 18:00:00 (CST)
Location: (MSN)TRUAX FLD MADIS
Reported by: LAW ENFORCEMENT

Heavy rains fell in the Madison area during the late afternoon of May 24th as storms rolled through the area.  Between 1700CST and 1800CST, 1.31 inches of rain fell at Madison's Traux Field, which contributed to a new daily record of 1.51 inches for the date.  Water quickly accumulated in low areas on some Madison roads, and in some cases, the water level reached vehicle floor boards. The deepest water was reported to be 18 inches.  The urban flooding started about 1730CST and ended about 1830CST.  About 25 vehicles stalled in the deep water.

Hail in SAUK, WISCONSIN
From 24-MAY-06 16:43:00 to 24-MAY-06 16:43:00 (CST)
Location: REEDSBURG
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in SAUK, WISCONSIN
From 24-MAY-06 16:39:00 to 24-MAY-06 16:39:00 (CST)
Location: SPRING GREEN
Magnitude: 50 MG
Reported by: AWOS,ASOS,MESONET,ETC

Lightning in WAUKESHA, WISCONSIN
From 24-MAY-06 18:30:00 to 24-MAY-06 18:30:00 (CST)
Location: BROOKFIELD
Property damage: 1K
Reported by: NEWSPAPER

Lightning striking the ground next to a home shattered its windows.

Thunderstorm Wind in DANE, WISCONSIN
From 24-MAY-06 18:00:00 to 24-MAY-06 18:00:00 (CST)
Location: STOUGHTON
Magnitude: 52 EG
Reported by: GENERAL PUBLIC

Thunderstorm Wind in DANE, WISCONSIN
From 24-MAY-06 17:35:00 to 24-MAY-06 17:35:00 (CST)
Location: MARXVILLE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Trees down.

Thunderstorm Wind in ROCK, WISCONSIN
From 24-MAY-06 17:30:00 to 24-MAY-06 17:30:00 (CST)
Location: COUNTYWIDE
Magnitude: 56 EG
Property damage: 20K
Reported by: NEWSPAPER