A low pressure system that passed through northwest Wisconsin dragged a cold front through the state.  Pulse severe thunderstorms developed in a moderately unstable air mass ahead of the front.  The storms produced hail up to golf ball size, downed trees and power lines, and destroyed a band stand in a small town park.

Hail in LINCOLN, WISCONSIN
From 20-MAY-12 12:25:00 to 20-MAY-12 12:25:00 (CST-6)
Location: SPIRIT FALLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorms dropped pea to nickel size hail near Spirit Falls.

Hail in VILAS, WISCONSIN
From 20-MAY-12 12:48:00 to 20-MAY-12 12:48:00 (CST-6)
Location: LAC DU FLAMBEAU
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms dropped golf ball size hail near Lac du Flambeau.

Hail in ONEIDA, WISCONSIN
From 20-MAY-12 12:55:00 to 20-MAY-12 12:55:00 (CST-6)
Location: CASSIAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell near Heafford Junction.

Hail in SHAWANO, WISCONSIN
From 20-MAY-12 13:30:00 to 20-MAY-12 13:30:00 (CST-6)
Location: ELAND
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar size hail fell at Eland.

Hail in LINCOLN, WISCONSIN
From 20-MAY-12 13:35:00 to 20-MAY-12 13:35:00 (CST-6)
Location: SPIRIT FALLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Nickel size hail fell at Spirit Falls.

Hail in ONEIDA, WISCONSIN
From 20-MAY-12 13:41:00 to 20-MAY-12 13:41:00 (CST-6)
Location: ROBBINS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell north of Sugar Camp.

Hail in VILAS, WISCONSIN
From 20-MAY-12 14:00:00 to 20-MAY-12 14:00:00 (CST-6)
Location: CONOVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell near Conover.

Hail in FOREST, WISCONSIN
From 20-MAY-12 14:30:00 to 20-MAY-12 14:30:00 (CST-6)
Location: WABENO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell at Wabeno.

Hail in MANITOWOC, WISCONSIN
From 20-MAY-12 16:55:00 to 20-MAY-12 16:55:00 (CST-6)
Location: KIEL
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An isolated thunderstorm produced a brief period of half-dollar size hail.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 20-MAY-12 13:15:00 to 20-MAY-12 13:15:00 (CST-6)
Location: SPIRIT FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees along US Highway 8 near Tripoli.

Thunderstorm Wind in FOREST, WISCONSIN
From 20-MAY-12 14:30:00 to 20-MAY-12 14:30:00 (CST-6)
Location: WABENO
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed trees and power lines and destroyed a band stand in downtown Wabeno.  The landmark band stand was in the community for more than 50 years.

Thunderstorm Wind in LANGLADE, WISCONSIN
From 20-MAY-12 14:30:00 to 20-MAY-12 14:30:00 (CST-6)
Location: NEVA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees a few miles northeast of Antigo.

Thunderstorm Wind in FLORENCE, WISCONSIN
From 20-MAY-12 14:55:00 to 20-MAY-12 14:55:00 (CST-6)
Location: FENCE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees and power lines in Fence.

Thunderstorm Wind in FLORENCE, WISCONSIN
From 20-MAY-12 15:05:00 to 20-MAY-12 15:05:00 (CST-6)
Location: RIDGETOP
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees and power lines southwest of Florence.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 20-MAY-12 16:42:00 to 20-MAY-12 16:42:00 (CST-6)
Location: COLEMAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees and power lines in Coleman.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 20-MAY-12 16:46:00 to 20-MAY-12 16:46:00 (CST-6)
Location: BEAVER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed trees and power lines in Beaver.

Hail in FOREST, WISCONSIN
From 20-MAY-12 14:30:00 to 20-MAY-12 14:30:00 (CST-6)
Location: WABENO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell near Wabeno.

Thunderstorm Wind in LANGLADE, WISCONSIN
From 20-MAY-12 14:25:00 to 20-MAY-12 14:25:00 (CST-6)
Location: ANTIGO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed trees and power lines along US Highway 45 in Antigo.

Hail in MARINETTE, WISCONSIN
From 20-MAY-12 16:42:00 to 20-MAY-12 16:42:00 (CST-6)
Location: AMBERG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell at Amberg.