Severe thunderstorms produced high winds, large hail, and a tornado across central and northeast Wisconsin on May 22, 2011.  Unstable air combined with a surface boundary and an upper air disturbance to produce thunderstorms.  Storms became severe during the afternoon and early evening, causing numerous incidents of large hail and isolated straight-line wind damage.  A long-track tornado moved from western Wisconsin into the central part of the state, snapping or uprooting many hundreds of trees and damaging several buildings and farm equipment.

Hail in CALUMET, WISCONSIN
From 22-MAY-11 16:20:00 to 22-MAY-11 16:20:00 (CST-6)
Location: HIGH CLIFF
Magnitude: 1.50 
Reported by: NWS Employee

Ping pong ball size hail fell southeast of Appleton.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:21:00 to 22-MAY-11 16:21:00 (CST-6)
Location: KAUKAUNA
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell in Kaukauna.

Hail in BROWN, WISCONSIN
From 22-MAY-11 16:29:00 to 22-MAY-11 16:29:00 (CST-6)
Location: WRIGHTSTOWN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Wrightstown.

Hail in KEWAUNEE, WISCONSIN
From 22-MAY-11 16:39:00 to 22-MAY-11 16:39:00 (CST-6)
Location: DYCKESVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Dyckesville.

Hail in BROWN, WISCONSIN
From 22-MAY-11 16:40:00 to 22-MAY-11 16:40:00 (CST-6)
Location: ALLOUEZ
Magnitude: 0.88 
Reported by: Amateur Radio

Nickel size hail fell near De Pere.

Hail in WOOD, WISCONSIN
From 22-MAY-11 16:55:00 to 22-MAY-11 16:55:00 (CST-6)
Location: BABCOCK
Magnitude: 1.00 
Reported by: Law Enforcement

Quarter size hail fell in Babcock.

Thunderstorm Wind in WAUPACA, WISCONSIN
From 22-MAY-11 14:41:00 to 22-MAY-11 14:41:00 (CST-6)
Location: WAUPACA
Magnitude: 52.00 EG
Reported by: Trained Spotter

A thunderstorm produced penny size hail and strong winds.  The winds from the storm downed tree branches in Waupaca.

Hail in WOOD, WISCONSIN
From 22-MAY-11 17:08:00 to 22-MAY-11 17:08:00 (CST-6)
Location: NEKOOSA
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Nekoosa.

Hail in WOOD, WISCONSIN
From 22-MAY-11 17:14:00 to 22-MAY-11 17:14:00 (CST-6)
Location: ALEXANDER SOUTHWD AR
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell near Wisconsin Rapids.

Hail in WOOD, WISCONSIN
From 22-MAY-11 17:23:00 to 22-MAY-11 17:23:00 (CST-6)
Location: ALEXANDER SOUTHWD AR
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell east of Wisconsin Rapids.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 17:36:00 to 22-MAY-11 17:36:00 (CST-6)
Location: PLOVER
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Plover, covering the ground.

Hail in WAUPACA, WISCONSIN
From 22-MAY-11 14:41:00 to 22-MAY-11 14:41:00 (CST-6)
Location: WAUPACA
Magnitude: 0.75 
Reported by: Trained Spotter

A thunderstorm produced penny size hail and strong winds. The winds from the storm downed tree branches in Waupaca.

Funnel Cloud in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:45:00 to 22-MAY-11 15:45:00 (CST-6)
Location: KAUKAUNA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was reported by the public over Kaukauna.

Funnel Cloud in KEWAUNEE, WISCONSIN
From 22-MAY-11 16:55:00 to 22-MAY-11 16:55:00 (CST-6)
Location: ALGOMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm spotter reported a funnel cloud over the west side of Algoma.

Hail in WOOD, WISCONSIN
From 22-MAY-11 13:30:00 to 22-MAY-11 13:30:00 (CST-6)
Location: MARSHFIELD
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Marshfield.

Hail in WAUSHARA, WISCONSIN
From 22-MAY-11 14:20:00 to 22-MAY-11 14:20:00 (CST-6)
Location: WAUTOMA ARPT
Magnitude: 1.00 
Reported by: Law Enforcement

Quarter size hail fell south of Wautoma.

Thunderstorm Wind in BROWN, WISCONSIN
From 22-MAY-11 16:05:00 to 22-MAY-11 16:05:00 (CST-6)
Location: GREEN BAY
Magnitude: 52.00 EG
Reported by: Trained Spotter

A storm spotter estimated thunderstorms wind gusts of 60 mph in Green Bay.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 17:30:00 to 22-MAY-11 17:30:00 (CST-6)
Location: KELLNER
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell in Kellner.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 17:35:00 to 22-MAY-11 17:35:00 (CST-6)
Location: ARNOTT
Magnitude: 1.50 
Reported by: Trained Spotter

Ping pong ball size hail fell in Arnott.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 14:38:00 to 22-MAY-11 14:38:00 (CST-6)
Location: AMHERST
Magnitude: 0.75 
Reported by: Storm Chaser

Penny size hail fell in Amherst.

Hail in WAUPACA, WISCONSIN
From 22-MAY-11 18:00:00 to 22-MAY-11 18:00:00 (CST-6)
Location: IOLA
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell north of Scandinavia.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 17:35:00 to 22-MAY-11 17:35:00 (CST-6)
Location: PLOVER
Magnitude: 3.00 
Reported by: Public

Thunderstorms produced hail up to three inches in diameter in Plover.

Thunderstorm Wind in BROWN, WISCONSIN
From 22-MAY-11 16:18:00 to 22-MAY-11 16:18:00 (CST-6)
Location: CORMIER
Magnitude: 52.00 EG
Reported by: Trained Spotter

Thunderstorm winds downed a power pole at the intersection of Mason Street and Packerland Drive in Green Bay.

Hail in WAUSHARA, WISCONSIN
From 22-MAY-11 14:45:00 to 22-MAY-11 14:45:00 (CST-6)
Location: POY SIPPI
Magnitude: 2.00 
Reported by: Trained Spotter

Lime size hail fell southwest of Poy Sippi.

Hail in WAUSHARA, WISCONSIN
From 22-MAY-11 14:47:00 to 22-MAY-11 14:47:00 (CST-6)
Location: BORTH
Magnitude: 1.50 
Reported by: Storm Chaser

Ping pong ball size hail fell in Borth.

Hail in PORTAGE, WISCONSIN
From 22-MAY-11 14:50:00 to 22-MAY-11 14:50:00 (CST-6)
Location: AMHERST
Magnitude: 1.00 
Reported by: Amateur Radio

Quarter size hail fell in Amherst.

Hail in WAUSHARA, WISCONSIN
From 22-MAY-11 14:51:00 to 22-MAY-11 14:51:00 (CST-6)
Location: POY SIPPI
Magnitude: 0.88 
Reported by: Trained Spotter

Nickel size hail fell south of Poy Sippi.

Hail in WAUPACA, WISCONSIN
From 22-MAY-11 15:01:00 to 22-MAY-11 15:01:00 (CST-6)
Location: SHERIDAN
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail fell on U.S. Highway 10 south of Sheridan.

Hail in WINNEBAGO, WISCONSIN
From 22-MAY-11 15:05:00 to 22-MAY-11 15:05:00 (CST-6)
Location: WINCHESTER
Magnitude: 4.25 
Property damage: 5.00K
Reported by: Law Enforcement

Hail, larger than softball size, fell at the intersection of U.S. Highways 10 and 45.

Tornado in WOOD, WISCONSIN
From 22-MAY-11 17:03:00 to 22-MAY-11 17:20:00 (CST-6)
Location: CRANMOOR
Tornado F-scale: EF1
Property damage: 1.02M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado moved out of Juneau County at 6:03 pm CDT (1703 CST) and moved east-northeast across southern Wood County.  The storm hit a campground on the east shore of the Wisconsin River about three miles south of Nekoosa.  Over 100 pine trees were snapped and uprooted on the campground, some two feet in diameter (DI 28 DOD 4).  Several camper vehicles were damaged by fallen trees.  The tornado was seen by campground visitors just before 6:15 pm.  The tornado continued east-northeast and snapped or uprooted hundreds of additional trees south of Wisconsin Rapids.  The storm damaged at least six homes and several other outbuildings about six miles south-southeast of Wisconsin Rapids.  One of the houses lost the entire roof of a garage (DI 2, DOD 4).  A woman in the garage at the time sustained injuries when the garage fell on the truck that she was taking shelter in.  This area experienced high-end EF1 damage with winds at least 95 to 105 mph.  The tornado entered Portage County at 6:20 PM CDT (1720 CST).

Tornado in PORTAGE, WISCONSIN
From 22-MAY-11 17:20:00 to 22-MAY-11 17:46:00 (CST-6)
Location: KELLNER
Tornado F-scale: EF1
Property damage: 1.80M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado entered Portage County from Wood County at 6:20 pm CDT (1720 CST) mainly over farmland.  The twister continued to snap trees (DI 28, DOD 4) and overturn agricultural irrigation systems.  About six miles south of Plover, a nearly half-mile long row of power poles were bent over (DI 24, DOD 3).  The tornado crossed Interstate 39 at Coddington Road two miles west of Keene.  The tornado grew to nearly 700 yards wide as it passed just north of Keene and heavily damaged a farmstead.  A silo was damaged and barn flattened (DI 1, DOD 6).  Several outbuildings were also damaged or destroyed.  Along the path, at least two dozen irrigation systems were overturned and damaged (resulting in over $1 million in losses) and many hundreds of trees snapped or uprooted.  This area also experienced high-end EF1 damage with winds of 100 to 110 mph.  The tornado dissipated about nine miles southeast of Plover at about 6:46 pm (1746 CST).  The average path width was 300 yards.

Hail in WAUPACA, WISCONSIN
From 22-MAY-11 15:06:00 to 22-MAY-11 15:06:00 (CST-6)
Location: SCANDINAVIA
Magnitude: 1.00 
Reported by: Trained Spotter

Penny to quarter size hail fell in Scandinavia.

Hail in WINNEBAGO, WISCONSIN
From 22-MAY-11 15:06:00 to 22-MAY-11 15:06:00 (CST-6)
Location: LAKE POYGAN
Magnitude: 1.00 
Reported by: Amateur Radio

Quarter size hail fell in Lake Poygan.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:07:00 to 22-MAY-11 15:07:00 (CST-6)
Location: DALE
Magnitude: 1.25 
Reported by: Amateur Radio

Half dollar size hail fell near Dale.

Hail in WINNEBAGO, WISCONSIN
From 22-MAY-11 15:07:00 to 22-MAY-11 15:07:00 (CST-6)
Location: WINCHESTER
Magnitude: 1.50 
Reported by: Trained Spotter

Ping pong ball size hail fell northwest of Larsen.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:12:00 to 22-MAY-11 15:12:00 (CST-6)
Location: GREENVILLE
Magnitude: 1.50 
Reported by: Trained Spotter

Ping pong ball size hail fell near Greenville.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:26:00 to 22-MAY-11 15:26:00 (CST-6)
Location: DALE
Magnitude: 1.25 
Reported by: Amateur Radio

Half dollar size hail fell in Dale.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:30:00 to 22-MAY-11 15:30:00 (CST-6)
Location: NEW LONDON
Magnitude: 1.75 
Reported by: Emergency Manager

Golf ball size hail fell southeast of New London.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:33:00 to 22-MAY-11 15:33:00 (CST-6)
Location: NEW LONDON
Magnitude: 1.75 
Reported by: Emergency Manager

Golf ball size hail fell east of New London.

Thunderstorm Wind in DOOR, WISCONSIN
From 22-MAY-11 17:08:00 to 22-MAY-11 17:08:00 (CST-6)
Location: FAIRLAND
Magnitude: 52.00 EG
Reported by: Public

Thunderstorm winds downed trees and power lines in Brussels.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:03:00 to 22-MAY-11 16:03:00 (CST-6)
Location: GREENVILLE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Grand Chute.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 15:45:00 to 22-MAY-11 15:45:00 (CST-6)
Location: BLACK CREEK
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell at Black Creek.

Funnel Cloud in PORTAGE, WISCONSIN
From 22-MAY-11 17:27:00 to 22-MAY-11 17:27:00 (CST-6)
Location: BANCROFT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported a funnel cloud over Bancroft.

Funnel Cloud in VILAS, WISCONSIN
From 22-MAY-11 17:55:00 to 22-MAY-11 17:55:00 (CST-6)
Location: LAC DU FLAMBEAU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter saw a funnel cloud near Lac du Flambeau.

Hail in WINNEBAGO, WISCONSIN
From 22-MAY-11 15:58:00 to 22-MAY-11 15:58:00 (CST-6)
Location: OSHKOSH
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell in Oshkosh.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:03:00 to 22-MAY-11 16:03:00 (CST-6)
Location: APPLETON
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell at Fox Valley Technical College.

Hail in WINNEBAGO, WISCONSIN
From 22-MAY-11 16:05:00 to 22-MAY-11 16:05:00 (CST-6)
Location: MENASHA
Magnitude: 0.88 
Reported by: Trained Spotter

Nickel size hail fell in Menasha.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:06:00 to 22-MAY-11 16:06:00 (CST-6)
Location: APPLETON
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell at Fox Valley Technical College.

Hail in BROWN, WISCONSIN
From 22-MAY-11 16:10:00 to 22-MAY-11 16:10:00 (CST-6)
Location: CORMIER
Magnitude: 1.50 
Reported by: Law Enforcement

Ping pong ball size hail fell in the Village of Howard.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:11:00 to 22-MAY-11 16:11:00 (CST-6)
Location: APPLETON
Magnitude: 1.50 
Reported by: Trained Spotter

Ping pong ball size hail fell at the campus of Lawrence University.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:12:00 to 22-MAY-11 16:12:00 (CST-6)
Location: APPLETON
Magnitude: 1.00 
Reported by: Emergency Manager

Dime to quarter size hail fell in Appleton.

Hail in CALUMET, WISCONSIN
From 22-MAY-11 16:15:00 to 22-MAY-11 16:15:00 (CST-6)
Location: HIGH CLIFF JCT
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell southeast of Darboy.

Hail in OUTAGAMIE, WISCONSIN
From 22-MAY-11 16:15:00 to 22-MAY-11 16:15:00 (CST-6)
Location: APPLETON
Magnitude: 1.00 
Reported by: Trained Spotter

Thunderstorms produced quarter size hail near Darboy.

Hail in WAUSHARA, WISCONSIN
From 22-MAY-11 14:35:00 to 22-MAY-11 14:35:00 (CST-6)
Location: REDGRANITE
Magnitude: 4.25 
Property damage: 5.00K
Reported by: Emergency Manager

Thunderstorms produced hail that covered the ground in Redgranite.  Some of the hail was larger than softball size.