Individual severe thunderstorms that developed over South Central Wisconsin, producing hail up to 1 inch in diameter, merged into several squall lines that produced damaging wind gusts as they moved east through Southeast Wisconsin during the afternoon and evening hours of May 30th. Overall forcing for ascent over the region was provided by  differential vorticity advection ahead of a progressive 500 mb negatively-tilted trough, with the storms developing on the nose of a moderate to strong low-level jet ahead of the wave. Moderate instability, reflected in mixed-layer CAPE values of 1000 to 1200 J/kg, and favorable wind shear contributed to conditions that produced broken bands of thunderstorms with damaging wind gusts and downbursts.

Thunderstorm Wind in ROCK, WISCONSIN
From 30-MAY-13 17:48:00 to 30-MAY-13 17:48:00 (CST-6)
Location: ORFORDVILLE
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported a few trees and power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) 5 miles west of Orfordville.

Thunderstorm Wind in ROCK, WISCONSIN
From 30-MAY-13 18:12:00 to 30-MAY-13 18:12:00 (CST-6)
Location: EDGERTON
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported eight trees and two power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) in Edgerton.

Thunderstorm Wind in DANE, WISCONSIN
From 30-MAY-13 18:10:00 to 30-MAY-13 18:10:00 (CST-6)
Location: MIDDLETON
Magnitude: 56.00 EG
Property damage: 75.00K
Reported by: Broadcast Media

Madison TV 27 reported numerous trees and power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) in Middleton. Some cars were damaged by the downed trees, as well as a tree piercing the roof of a condominium. A shed was also destroyed by the damaging thunderstorm wind gusts.

Thunderstorm Wind in DANE, WISCONSIN
From 30-MAY-13 18:30:00 to 30-MAY-13 18:30:00 (CST-6)
Location: COTTAGE GROVE
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Public

The public reported trees and power lines downed by thunderstorm wind gusts estimated at 65 mph (56 knots) 3 miles west of Cottage Grove.

Thunderstorm Wind in ROCK, WISCONSIN
From 30-MAY-13 18:15:00 to 30-MAY-13 18:15:00 (CST-6)
Location: NEWARK
Magnitude: 56.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported a few trees and power lines downed by thunderstorm wind gusts estimated at 65 mph (56 knots) in Newark.

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 30-MAY-13 14:23:00 to 30-MAY-13 14:23:00 (CST-6)
Location: YELLOWSTONE LAKE STATE PARK
Magnitude: 43.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported a tree blown down onto a power line by a  thunderstorm wind estimated at 50 mph (43 knots) 3 miles west-southwest of Yellowstone Lake Park.

Thunderstorm Wind in SAUK, WISCONSIN
From 30-MAY-13 14:32:00 to 30-MAY-13 14:32:00 (CST-6)
Location: HILLPT
Magnitude: 56.00 EG
Property damage: 12.00K
Reported by: Law Enforcement

Law enforcement officials reported trees blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) in the Hill Point area.

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 30-MAY-13 17:00:00 to 30-MAY-13 17:10:00 (CST-6)
Location: COLUMBUS
Magnitude: 56.00 EG
Property damage: 20.00K
Reported by: Law Enforcement

Law enforcement officials reported trees two feet in diameter blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) along a path from 2 miles south of Columbus to Fall River.

Thunderstorm Wind in DODGE, WISCONSIN
From 30-MAY-13 19:06:00 to 30-MAY-13 19:06:00 (CST-6)
Location: BEAVER DAM ARPT
Magnitude: 61.00 EG
Property damage: 20.00K
Reported by: Emergency Manager

The Dodge County Emergency Manager reported the roof of a barn was blown off, and trees in a cemetery on County Highway G downed by thunderstorm wind gusts estimated at 70 mph (61 knots) along a path from about 2 miles west of Beaver Dam into Beaver Dam.

Thunderstorm Wind in DODGE, WISCONSIN
From 30-MAY-13 19:38:00 to 30-MAY-13 19:50:00 (CST-6)
Location: MAYVILLE
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported a few trees and power lines downed by  thunderstorm wind gusts estimated at 70 mph (61 knots) along a path from Mayville to Brownsville.

Hail in DANE, WISCONSIN
From 30-MAY-13 12:22:00 to 30-MAY-13 12:22:00 (CST-6)
Location: TOKEN CREEK
Magnitude: 1.00 
Reported by: Public

The public reported hail measured to 1 inch in diameter in Token Creek.

Thunderstorm Wind in DODGE, WISCONSIN
From 30-MAY-13 13:08:00 to 30-MAY-13 13:08:00 (CST-6)
Location: RANDOLPH
Magnitude: 56.00 EG
Property damage: 12.00K
Reported by: Law Enforcement

Law enforcement officials reported trees downed by thunderstorm wind gusts estimated at 65 mph (56 knots) 3 miles southeast of Randolph.

Thunderstorm Wind in GREEN, WISCONSIN
From 30-MAY-13 17:34:00 to 30-MAY-13 17:50:00 (CST-6)
Location: JUDA
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Law enforcement officials reported trees and power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) along a 5 mile-wide swath from 5 miles south-southwest of Juda to Albany. A mesonet site along the path measured a 60 mph (52 knot) wind gust.

Thunderstorm Wind in DANE, WISCONSIN
From 30-MAY-13 18:24:00 to 30-MAY-13 18:24:00 (CST-6)
Location: (MSN)TRUAX FLD MADIS
Magnitude: 56.00 EG
Property damage: 50.00K
Reported by: Newspaper

A newspaper article reported 23 trees and numerous power-lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) about 1 mile west-northwest of Dane County Regional Airport. Some cars and homes were also damaged by the downed trees.

Thunderstorm Wind in DANE, WISCONSIN
From 30-MAY-13 18:15:00 to 30-MAY-13 18:15:00 (CST-6)
Location: DOWNTOWN MADISON
Magnitude: 52.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

A trained spotter reported several large tree branches in excess of 6 inches in diameter downed by thunderstorm wind gusts estimated at 60 mph (52 knots) 7 miles southwest of the State Capitol in Madison.  A couple power-lines were snapped by the tree debris.

Thunderstorm Wind in FOND DU LAC, WISCONSIN
From 30-MAY-13 13:35:00 to 30-MAY-13 13:35:00 (CST-6)
Location: ROSENDALE
Magnitude: 56.00 EG
Property damage: 30.00K
Reported by: Law Enforcement

Law enforcement officials reported trees downed by thunderstorm wind gusts estimated at 65 mph (56 knots) across the Village of Rosendale.

Thunderstorm Wind in GREEN, WISCONSIN
From 30-MAY-13 17:28:00 to 30-MAY-13 17:55:00 (CST-6)
Location: BROWNTOWN
Magnitude: 56.00 EG
Property damage: 30.00K
Reported by: Law Enforcement

Law enforcement officials reported trees and power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) along a 15 mile-wide path from 5 miles south-southeast of Browntown to Dayton.

Thunderstorm Wind in WALWORTH, WISCONSIN
From 30-MAY-13 18:47:00 to 30-MAY-13 18:50:00 (CST-6)
Location: DELAVAN
Magnitude: 61.00 EG
Property damage: 100.00K
Reported by: Law Enforcement

Law enforcement officials reported 20 buildings were damaged and around 40 trees and numerous power lines downed by a thunderstorm microburst with wind gusts estimated at 70 mph (61 knots) along a 2 mile-long, 1/4 to 1/2 mile-wide path through the City of Delavan.

Thunderstorm Wind in DODGE, WISCONSIN
From 30-MAY-13 13:08:00 to 30-MAY-13 13:08:00 (CST-6)
Location: RANDOLPH
Magnitude: 56.00 EG
Property damage: 12.00K
Reported by: Law Enforcement

Law enforcement officials reported trees downed by thunderstorm wind gusts estimated at 65 mph (56 knots) in Randolph.