A warm front set up across far southern Wisconsin on the afternoon of June 18th as an upper level disturbance moved eastward into the Upper Midwest.  A line of severe thunderstorms formed in an area of very warm, unstable air and moved through south-central and southeast Wisconsin overnight.  With surface dewpoints near 70, MLCAPE values near 3000 J/kg, and strong wind shear, the storms produced damaging winds, large hail up to 2.75 inches in diameter, dangerous lightning, and a weak tornado. These thunderstorms also dumped very heavy rain up to 4 inches over a relatively short period of time, causing numerous reports of flash flooding across Dane, Waukesha, and Milwaukee counties.  At the height of the storms, about 27,000 households were without electricity in southeastern Wisconsin due to damaged power-lines.

Thunderstorm Wind in IOWA, WISCONSIN
From 18-JUN-09 22:45:00 to 18-JUN-09 22:45:00 (CST-6)
Location: DODGEVILLE
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Many reports of toppled trees and damaged power-lines were received from within and near Dodgeville to a couple miles east of Mineral Point.

Thunderstorm Wind in KENOSHA, WISCONSIN
From 18-JUN-09 23:58:00 to 18-JUN-09 23:58:00 (CST-6)
Location: DOWNTOWN KENOSHA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few large trees were toppled.

Thunderstorm Wind in KENOSHA, WISCONSIN
From 19-JUN-09 01:03:00 to 19-JUN-09 01:03:00 (CST-6)
Location: DOWNTOWN KENOSHA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few large trees were toppled.

Lightning in RACINE, WISCONSIN
From 19-JUN-09 02:05:00 to 19-JUN-09 02:05:00 (CST-6)
Location: DOWNTOWN RACINE
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Newspaper

Lighthing struck a home shortly after 0200 CST.  The resultant fire damaged an upstairs bedroom.  The homes elecrical system was fried by the lightning strike.

Thunderstorm Wind in IOWA, WISCONSIN
From 18-JUN-09 23:04:00 to 18-JUN-09 23:04:00 (CST-6)
Location: DODGEVILLE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An entire grove of trees was toppled.

Hail in IOWA, WISCONSIN
From 18-JUN-09 23:02:00 to 18-JUN-09 23:02:00 (CST-6)
Location: DODGEVILLE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IOWA, WISCONSIN
From 18-JUN-09 23:23:00 to 18-JUN-09 23:23:00 (CST-6)
Location: HOLLANDALE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Flash Flood in WAUKESHA, WISCONSIN
From 19-JUN-09 00:10:00 to 19-JUN-09 03:00:00 (CST-6)
Location: DOWNTOWN WAUKESHA
Flood cause: Heavy Rain
Property damage: 120.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous reports of flash flooding were received from the Waukesha to Brookfield and New Berlin areas.  A couple gravel shoulder washouts were reported, and some minor damage to basement contents occurred.  Water depths on roads reached 1 to 3 feet.  A water control facility in New Berlin was damaged by flood waters ($100K).

Thunderstorm Wind in DANE, WISCONSIN
From 18-JUN-09 23:20:00 to 18-JUN-09 23:20:00 (CST-6)
Location: MIDDLETON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Seveal large trees blown down by thunderstorm winds.

Flash Flood in MILWAUKEE, WISCONSIN
From 19-JUN-09 00:10:00 to 19-JUN-09 03:00:00 (CST-6)
Location: DOWNTOWN MILWAUKEE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Numerous reports of flash flooding were received from the West Allis, Wauwatosa, Milwaukee, and Greenfield areas.  Several roads were flooded to a depth of 1 to 3 feet, and there was standing water on I-894 in Greenfield.  West Allis received 3.68 of rain in 1 hour around the midnight hour.  A couple cars sustained water damage.

Thunderstorm Wind in ROCK, WISCONSIN
From 18-JUN-09 23:45:00 to 18-JUN-09 23:45:00 (CST-6)
Location: EVANSVILLE
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Seveal large trees were toppled and a couple power-lines down sustained damage due to tree debris.  A tree fell on a car.

Thunderstorm Wind in RACINE, WISCONSIN
From 19-JUN-09 00:06:00 to 19-JUN-09 00:11:00 (CST-6)
Location: DOWNTOWN RACINE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A few large trees were toppled.

Thunderstorm Wind in RACINE, WISCONSIN
From 19-JUN-09 00:20:00 to 19-JUN-09 00:20:00 (CST-6)
Location: UNION GROVE
Magnitude: 59.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large trees blown down by thunderstorm winds and tree debris was noted on several streets.

Tornado in IOWA, WISCONSIN
From 18-JUN-09 22:27:00 to 18-JUN-09 22:28:00 (CST-6)
Location: PINE KNOB
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief, weak, minimal EFO tornado spun up around 5 miles east-northeast of Highland.  A few large trees were uprooted or damaged around the intersection of CTH P and Council Bluffs Road.  Average path width was about 25 yards.  Maximum wind speeds were estimated at 56 to 61 knots (65-70 mph).  The path compass bearing was 100 degrees.   The beginning and ending points were 43.06442/-90.28184 and 43.06312/-90.27297. DI#27(TH), DOD2.

Thunderstorm Wind in DODGE, WISCONSIN
From 18-JUN-09 23:05:00 to 18-JUN-09 23:05:00 (CST-6)
Location: IRON RIDGE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees were blown down from thunderstorm winds.  One road was blocked by tree debris.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 18-JUN-09 23:50:00 to 18-JUN-09 23:50:00 (CST-6)
Location: FT ATKINSON
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few large trees were toppled and power-line were down due to tree debris.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 18-JUN-09 23:35:00 to 18-JUN-09 23:35:00 (CST-6)
Location: DOWNTOWN WAUKESHA
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several large trees were toppled and a couple power-lines sustained damage due to tree debris.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 19-JUN-09 00:10:00 to 19-JUN-09 00:10:00 (CST-6)
Location: MILLARD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few large trees were blown down by thunderstorm winds.

Thunderstorm Wind in RACINE, WISCONSIN
From 19-JUN-09 00:03:00 to 19-JUN-09 00:03:00 (CST-6)
Location: WIND LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A few large trees were toppled.

Funnel Cloud in RACINE, WISCONSIN
From 19-JUN-09 00:05:00 to 19-JUN-09 00:05:00 (CST-6)
Location: UNION GROVE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in IOWA, WISCONSIN
From 18-JUN-09 22:45:00 to 18-JUN-09 22:45:00 (CST-6)
Location: DODGEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in IOWA, WISCONSIN
From 18-JUN-09 23:00:00 to 18-JUN-09 23:00:00 (CST-6)
Location: MINERAL PT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in IOWA, WISCONSIN
From 18-JUN-09 23:00:00 to 18-JUN-09 23:00:00 (CST-6)
Location: RIDGEWAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in DANE, WISCONSIN
From 18-JUN-09 22:20:00 to 18-JUN-09 22:25:00 (CST-6)
Location: DANE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail increased from 1.75 at 22:23 to 2.75 at 22:25.

Flash Flood in DANE, WISCONSIN
From 18-JUN-09 23:05:00 to 19-JUN-09 03:00:00 (CST-6)
Location: SUN PRAIRIE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfalls of 1 to 3 inches (estimate based on radar and reports) in the Madison to Sun Prairie area resulted in flash flooding.  Many streets and roads were flooded to a depth of 1 to 3 feet.  Several gravel shoulder washouts were reported.

Hail in IOWA, WISCONSIN
From 18-JUN-09 23:04:00 to 18-JUN-09 23:04:00 (CST-6)
Location: DODGEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement