Two rounds of severe weather affected south-central and southeast Wisconsin on July 10th.  An initial cluster of storms north of the Milwaukee area in Ozaukee County pulsed to severe limits and generated large hail up to 3/4 inch in diameter during the early afternoon hours.  A second round of severe weather was associated with several clusters or short bowing segments of lines of storms that moved west to east across southern Wisconsin during the late afternoon and evening hours.  Surface temperatures in the 80s and surface dewpoints in the 60s resulted in CAPE values of 1500 to 2000 while a vorticiy maxima at 500 MB moved across Wisconsin.  Veering winds allowed for the development of rotating updrafts in a couple cells that generated two weak tornadoes.  Otherwise, the severe weather type was powerful downburst winds.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 10-JUL-08 17:22:00 to 10-JUL-08 17:22:00 (CST-6)
Location: SULLIVAN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Powerful thunderstorm wind gust measured at NWS office.

Hail in OZAUKEE, WISCONSIN
From 10-JUL-08 12:20:00 to 10-JUL-08 12:30:00 (CST-6)
Location: CEDARBURG
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in OZAUKEE, WISCONSIN
From 10-JUL-08 12:27:00 to 10-JUL-08 12:27:00 (CST-6)
Location: SAUKVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Unknown

Tree down.

Thunderstorm Wind in SAUK, WISCONSIN
From 10-JUL-08 15:30:00 to 10-JUL-08 15:55:00 (CST-6)
Location: LA VALLE
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled large trees and broke branches that brought down some power-lines.

Tornado in DODGE, WISCONSIN
From 10-JUL-08 17:00:00 to 10-JUL-08 17:02:00 (CST-6)
Location: WAUPUN ARPT
Tornado F-scale: EF1
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

This weak tornado uprooted 9 large oak trees and damage a barn roof.  It spun up just northeast of the intersection of CTH W and CTH F and moved east-northeast across STH 68 near a bend in STH 68, and dissipated just southeast of the intersection of STH 68 and Buckhorn Road.  The starting and end lat/long pairs of numbers are: 43.60684/-88.82342 and 43.61147/-88.80410.  DI#27 (TH), DOD3.  The winds were estimated at 94 mph.  The average path width was about 30 yards.

Thunderstorm Wind in ROCK, WISCONSIN
From 10-JUL-08 17:09:00 to 10-JUL-08 17:10:00 (CST-6)
Location: DOWNTOWN JANESVILLE
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 10-JUL-08 17:00:00 to 10-JUL-08 17:08:00 (CST-6)
Location: JOHNSON CREEK
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.  Five tents were damaged at the Jefferson County Fairgrounds.

Tornado in GREEN LAKE, WISCONSIN
From 10-JUL-08 16:33:00 to 10-JUL-08 16:35:00 (CST-6)
Location: DALTON
Tornado F-scale: EF1
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A weak tornado spun up about 1/2 mile southwest of Downtown Dalton near a creek and proceeded to track east across STH 44 just northeast of the intersection of STH 44 and South Main Steet, and ultimately dissipated about 1/2 mile east-southeast of Downtown Dalton just southeast of the intersection of Fountain Lane and Belle Fountain Creek.  It took the roof off of a lumberyard pole shed, took part of a roof off an office building, uprooted trees, and brought down some power-lines.   The starting and ending lat/long pairs of numbers are 43.65243/-89.21794 and 43.65347/-89.19503.  DI#1 (SBO), DOD 5.  The winds were estimated at 93 mph.  The average path width was about 50 yards.

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 10-JUL-08 17:00:00 to 10-JUL-08 17:00:00 (CST-6)
Location: BRANDON
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 10-JUL-08 16:12:00 to 10-JUL-08 16:20:00 (CST-6)
Location: WESTFIELD
Magnitude: 56.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled large trees and broke branches that brought down some power-lines in locations scattered across the county.  Three trailer homes about 6 miles east-northeast of Montello were damaged as two large trees came down in the winds.

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 10-JUL-08 16:32:00 to 10-JUL-08 16:42:00 (CST-6)
Location: PRINCETON
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled large trees and broke branches that brought down some power-lines. One tree fell onto a trailer near Princeton.

Thunderstorm Wind in DODGE, WISCONSIN
From 10-JUL-08 16:56:00 to 10-JUL-08 16:56:00 (CST-6)
Location: BEAVER DAM
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 10-JUL-08 17:17:00 to 10-JUL-08 17:17:00 (CST-6)
Location: WHITEWATER
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 10-JUL-08 17:32:00 to 10-JUL-08 17:32:00 (CST-6)
Location: EAGLE
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 10-JUL-08 16:07:00 to 10-JUL-08 16:07:00 (CST-6)
Location: PORTAGE
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in DANE, WISCONSIN
From 10-JUL-08 16:18:00 to 10-JUL-08 16:18:00 (CST-6)
Location: CROSS PLAINS
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in DANE, WISCONSIN
From 10-JUL-08 16:38:00 to 10-JUL-08 16:38:00 (CST-6)
Location: MC FARLAND
Magnitude: 78.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled large trees and broke branches that brought down some power-lines. In McFarland, a house was blown down, and tree debris damaged a restaurant .

Thunderstorm Wind in WALWORTH, WISCONSIN
From 10-JUL-08 17:25:00 to 10-JUL-08 17:30:00 (CST-6)
Location: DARIEN
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.  At least 6 homes sustained damage due to tree debris in the Walworth to Williams Bay area.

Flash Flood in LAFAYETTE, WISCONSIN
From 10-JUL-08 18:00:00 to 10-JUL-08 19:00:00 (CST-6)
Location: BENTON
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rains of 2 to 3 inches within 1 to 1.5 hours resulted in flash flooding in and around Benton as water depths reached 3 feet on some roads.  Some gravel shoulder washouts were noted.

Thunderstorm Wind in RACINE, WISCONSIN
From 10-JUL-08 17:44:00 to 10-JUL-08 17:44:00 (CST-6)
Location: TICHIGAN
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.

Thunderstorm Wind in GREEN, WISCONSIN
From 10-JUL-08 16:58:00 to 10-JUL-08 16:58:00 (CST-6)
Location: ALBANY
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Powerful thunderstorm wind gusts toppled several large trees and broke branches that brought down some power-lines.