A strengthening upper level jet, in excess of 90 knots, contributed to the develop of elevated thunderstorms ahead of a warm front that moved across Wisconsin.

Hail in VILAS, WISCONSIN
From 25-MAY-08 14:22:00 to 25-MAY-08 14:22:00 (CST-6)
Location: ST GERMAIN
Magnitude: 2.00 
Property damage: 250.00K
Reported by: Fire Department/Rescue

Large hail damaged vehicles and structures near St. Germain.  A vehicle dealership on the east side of the city suffered the most extensive damage. Every car on the lot sustained damaged.  Every vehicle at a repair shop in town was damaged except for a 1972 Pontiac Lemans.  This was likely due to the thicker steel used in the body of the Lemans.  One man was unable to get his hand around a hailstone that crashed through the kitchen skylight of his home.

Thunderstorm Wind in PORTAGE, WISCONSIN
From 25-MAY-08 18:15:00 to 25-MAY-08 18:15:00 (CST-6)
Location: CUSTER
Magnitude: 70.00 EG
Reported by: Public

Downburst thunderstorm winds blew down a dozen large trees and damaged serveral sheds in rural Custer.

Hail in VILAS, WISCONSIN
From 25-MAY-08 14:12:00 to 25-MAY-08 14:12:00 (CST-6)
Location: ARBOR VITAE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in VILAS, WISCONSIN
From 25-MAY-08 14:35:00 to 25-MAY-08 14:35:00 (CST-6)
Location: EAGLE RIVER ARPT
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in VILAS, WISCONSIN
From 25-MAY-08 14:37:00 to 25-MAY-08 14:37:00 (CST-6)
Location: EAGLE RIVER
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in VILAS, WISCONSIN
From 25-MAY-08 14:05:00 to 25-MAY-08 14:05:00 (CST-6)
Location: LAC DU FLAMBEAU STN
Magnitude: 2.00 
Reported by: Public

A research meteorologist, from the University of Wisconsin Space Science and Engineering Center, reported vehicle damage caused by lime size hail on the east end of Middle Sugarbush Lake.

Hail in FLORENCE, WISCONSIN
From 25-MAY-08 15:13:00 to 25-MAY-08 15:13:00 (CST-6)
Location: TIPLER
Magnitude: 2.00 
Reported by: Trained Spotter

Large hail fell near Tipler but there was little rain or wind with it.

Hail in FLORENCE, WISCONSIN
From 25-MAY-08 16:05:00 to 25-MAY-08 16:05:00 (CST-6)
Location: LONG LAKE
Magnitude: 1.00 
Reported by: Public

Hail in FLORENCE, WISCONSIN
From 25-MAY-08 16:25:00 to 25-MAY-08 16:25:00 (CST-6)
Location: SPREAD EAGLE
Magnitude: 0.88 
Reported by: Trained Spotter

A spotter observed nickel size hail that stripped leaves and small twigs from trees. The hail was two inches deep.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 25-MAY-08 19:40:00 to 25-MAY-08 19:40:00 (CST-6)
Location: MERRILL MUNI ARPT
Magnitude: 52.00 EG
Reported by: Amateur Radio

Hail in MARATHON, WISCONSIN
From 25-MAY-08 19:25:00 to 25-MAY-08 19:25:00 (CST-6)
Location: ROZELLVILLE
Magnitude: 1.00 
Reported by: Fire Department/Rescue

Hail in MARATHON, WISCONSIN
From 25-MAY-08 19:20:00 to 25-MAY-08 19:20:00 (CST-6)
Location: ROZELLVILLE
Magnitude: 0.88 
Reported by: COOP Observer

Hail in MARINETTE, WISCONSIN
From 25-MAY-08 16:30:00 to 25-MAY-08 16:30:00 (CST-6)
Location: NIAGARA
Magnitude: 0.88 
Reported by: Trained Spotter

A spotter reported nickel size hail coving the ground.

Hail in PORTAGE, WISCONSIN
From 25-MAY-08 18:09:00 to 25-MAY-08 18:09:00 (CST-6)
Location: PLOVER
Magnitude: 1.50 
Reported by: COOP Observer

Hail in PORTAGE, WISCONSIN
From 25-MAY-08 20:25:00 to 25-MAY-08 20:25:00 (CST-6)
Location: PARK RIDGE
Magnitude: 0.75 
Reported by: Trained Spotter

Hail in VILAS, WISCONSIN
From 25-MAY-08 15:14:00 to 25-MAY-08 15:14:00 (CST-6)
Location: ST GERMAIN
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in WOOD, WISCONSIN
From 25-MAY-08 17:54:00 to 25-MAY-08 17:54:00 (CST-6)
Location: PORT EDWARDS
Magnitude: 0.75 
Reported by: Law Enforcement

Hail in WOOD, WISCONSIN
From 25-MAY-08 18:01:00 to 25-MAY-08 18:01:00 (CST-6)
Location: WISCONSIN RAPIDS
Magnitude: 0.88 
Reported by: Storm Chaser

Hail in FOREST, WISCONSIN
From 25-MAY-08 15:05:00 to 25-MAY-08 15:05:00 (CST-6)
Location: NELMA
Magnitude: 1.75 
Reported by: COOP Observer

Golf ball size hail dented several cars near Alvin.

Thunderstorm Wind in MARATHON, WISCONSIN
From 25-MAY-08 19:24:00 to 25-MAY-08 19:24:00 (CST-6)
Location: SPENCER
Magnitude: 56.00 MG
Reported by: Trained Spotter

Hail in MARATHON, WISCONSIN
From 25-MAY-08 19:24:00 to 25-MAY-08 19:24:00 (CST-6)
Location: SPENCER
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorm Wind in MARATHON, WISCONSIN
From 25-MAY-08 19:25:00 to 25-MAY-08 19:25:00 (CST-6)
Location: ROZELLVILLE
Magnitude: 70.00 EG
Reported by: Law Enforcement

A barn was damaged, trees blown down, and three silo tops sustained damage as strong thunderstorm winds hit just south of Stratford.

Tornado in MARATHON, WISCONSIN
From 25-MAY-08 20:00:00 to 25-MAY-08 20:01:00 (CST-6)
Location: KNOWLTON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A weak tornado briefly touched down about five miles southeast of Mosinee. Several apple trees were damaged (DI 27, DOD 2) in a narrow path.  A pine tree fell on a shed as well.  The tornado was on the ground for less than 30 seconds.