Warm frontal boundary induced severe weather.

Thunderstorm Wind in POLK, WISCONSIN
From 13-AUG-07 20:25:00 to 13-AUG-07 21:00:00 (CST-6)
Location: MILLTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

About two dozen trees were reported down across roads and power lines in a swath several miles wide.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 13-AUG-07 20:35:00 to 13-AUG-07 21:10:00 (CST-6)
Location: NEW RICHMOND
Magnitude: 78.00 EG
Property damage: 35.00M
Crop damage: 10.00M
Reported by: NWS Storm Survey

A large swath of severe thunderstorm wind damage occurred from just west of New Richmond to the Glenwood City area, as determined by a National Weather Service damage survey. This swath of damage occurred within an approximately two to four mile width between these two cities. Numerous reports of damage were provided by the St. Croix County emergency manager, trained spotters, amateur radio operators and law enforcement. The New Richmond Airport AWOS also measured 60 knots at 2043 CST (two hangars were damaged).  Some general reports include: 109 homes damaged or severely damaged, 48 barns damaged or severely damaged. In New Richmond, many 6 inch diameter or larger trees reported felled, and some light poles down throughout New Richmond; some roads were impassable due to downed trees; railroad crossing arms bent over at crossing. Some barns with significant damage reported on 140th Ave. (at residence numbers: 1703, 1793, 2540, 2578 and 2583). A roof torn off or other damages were reported on 160th St. (at residence numbers: 1593, 1769 and 1793), along with 1248 290th St. The back of a house was reported torn away at 2540 140th Ave., with another home damaged at 1506 County Road G. In Glenwood City, one to two foot diameter trees were reported down along with power lines. Two barns were reported destroyed near Emerald. A house was also rendered uninhabitable three miles east-southeast of New Richmond. One home at County G and GG was completely destroyed. Sheriff Dennis Hillstead said damage county wide was significant,and that it had been 10 to 12 years since the county had seen such widespread damage. The Luckwaldt Dairy north of Woodville received heavy damage, including ripping aprt the canvas covering to the barn. One cow was also lost. Significant damage was also reported at the Emeral Dairy in Emerald. Near Emerald Dairy, along county Highway G, barns, homes and corn fields were flattened. Power lines and trees were also toppled. The entire village of Hammond and some outlying areas were without power for approximately 12 hours Tuesday morning. Significant damage to Xcel Energy's electrical grid was reported during the early morning storms. A total of 24 transmission poles were broken or damaged and needed to be replaced across the Western Wisconsin. At the peak of the storm about 20,000 customers in western Wisconsin lost power from both high winds and lightning strikes. As reported by the following newspapers: Baldwin Bulletin, Hudson Star-Observer, County Today, Central St. Croix News, and the Courier Wedge.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 13-AUG-07 21:00:00 to 13-AUG-07 21:00:00 (CST-6)
Location: WILSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Tree felled onto house.

Thunderstorm Wind in PIERCE, WISCONSIN
From 13-AUG-07 22:40:00 to 13-AUG-07 22:40:00 (CST-6)
Location: RIVER FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

About one dozen trees down across town, including some on power lines and vehicles.

Thunderstorm Wind in ST. CROIX, WISCONSIN
From 13-AUG-07 22:40:00 to 13-AUG-07 22:40:00 (CST-6)
Location: RIVER FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Few trees down.

Thunderstorm Wind in PIERCE, WISCONSIN
From 13-AUG-07 23:00:00 to 13-AUG-07 23:10:00 (CST-6)
Location: SPRING VALLEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Few trees down.

Thunderstorm Wind in DUNN, WISCONSIN
From 13-AUG-07 21:25:00 to 13-AUG-07 21:25:00 (CST-6)
Location: MENOMONIE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two twelve inch pine trees downed.

Thunderstorm Wind in DUNN, WISCONSIN
From 13-AUG-07 21:30:00 to 13-AUG-07 21:30:00 (CST-6)
Location: MENOMONIE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large four inch branches down at intersection of 29th and 21st St. Power lines and street lights were also downed in Menomonie.

Thunderstorm Wind in PEPIN, WISCONSIN
From 13-AUG-07 23:25:00 to 13-AUG-07 23:25:00 (CST-6)
Location: PEPIN
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous large trees down. Some 12 inches in diameter.

Hail in POLK, WISCONSIN
From 13-AUG-07 20:31:00 to 13-AUG-07 20:31:00 (CST-6)
Location: OSCEOLA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in ST. CROIX, WISCONSIN
From 13-AUG-07 20:55:00 to 13-AUG-07 20:55:00 (CST-6)
Location: HAMMOND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

In addition, measured 47 mph winds at 840 pm.

Thunderstorm Wind in PEPIN, WISCONSIN
From 13-AUG-07 21:59:00 to 13-AUG-07 21:59:00 (CST-6)
Location: DURAND
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Doors blown off building.