Thunderstorms developed in the vicinity of a frontal boundary and an upper level disturbance. Some of the storms were severe with large hail and damaging winds. Most of the large hail was in the penny to quarter size range, but hail as large as golf ball size fell near Lac du Flambeau (Vilas Co.). Thunderstorm winds downed power lines and hundreds of trees, tore the roof from a mobile home, and heavily damaged a metal outbuilding. Microburst winds, estimated near 80 mph, downed nearly 200 trees in southwest Marathon County.  A weak tornado briefly touched down in the Wausau area (Marathon Co.).

Hail in MARATHON, WISCONSIN
From 09-APR-17 23:35:00 to 09-APR-17 23:35:00 (CST-6)
Location: ROZELLVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail fell near Stratford.

Hail in MARATHON, WISCONSIN
From 09-APR-17 23:55:00 to 09-APR-17 23:55:00 (CST-6)
Location: WAUSAU
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Nickel size hail fell west of Wausau.

Hail in LINCOLN, WISCONSIN
From 10-APR-17 00:15:00 to 10-APR-17 00:15:00 (CST-6)
Location: MERRILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced nickel size hail and wind gusts to 50 mph as they passed through Merrill.

Hail in WOOD, WISCONSIN
From 10-APR-17 00:53:00 to 10-APR-17 00:53:00 (CST-6)
Location: NEKOOSA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Nickel size hail fell near Nekoosa.

Hail in KEWAUNEE, WISCONSIN
From 10-APR-17 05:55:00 to 10-APR-17 05:55:00 (CST-6)
Location: ROSTOK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter size hail fell north of Kewaunee.

Thunderstorm Wind in ONEIDA, WISCONSIN
From 09-APR-17 22:30:00 to 09-APR-17 22:30:00 (CST-6)
Location: WOODRUFF
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds downed trees in Woodruff. The time of this report is estimated.

Thunderstorm Wind in MARATHON, WISCONSIN
From 10-APR-17 00:05:00 to 10-APR-17 00:05:00 (CST-6)
Location: WAUSAU
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds snapped and uprooted trees, and downed power lines in the vicinity of Horseshoe Springs Road and Sylvan Street in Wausau. The storms also produced pea size hail.

Thunderstorm Wind in VILAS, WISCONSIN
From 09-APR-17 22:35:00 to 09-APR-17 22:35:00 (CST-6)
Location: ARBOR VITAE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed numerous trees around Arbor Vitae.

Thunderstorm Wind in FOREST, WISCONSIN
From 10-APR-17 00:00:00 to 10-APR-17 00:00:00 (CST-6)
Location: HILES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds downed several trees and power lines northeast of Hiles.

Thunderstorm Wind in MARATHON, WISCONSIN
From 09-APR-17 23:45:00 to 09-APR-17 23:45:00 (CST-6)
Location: EDGAR
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds heavily damaged a metal outbuilding and downed several trees and power lines near Edgar.

Thunderstorm Wind in VILAS, WISCONSIN
From 09-APR-17 22:28:00 to 09-APR-17 22:28:00 (CST-6)
Location: LAC DU FLAMBEAU
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds uprooted and damaged dozens of trees near Lac du Flambeau.

Hail in MARATHON, WISCONSIN
From 10-APR-17 00:05:00 to 10-APR-17 00:05:00 (CST-6)
Location: WAUSAU
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell in Wausau.

Thunderstorm Wind in MARATHON, WISCONSIN
From 09-APR-17 23:26:00 to 09-APR-17 23:26:00 (CST-6)
Location: MANN
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Nearly 200 trees were toppled, most uprooted, by a thunderstorm microburst with winds estimated near 80 mph.

Tornado in MARATHON, WISCONSIN
From 09-APR-17 23:54:00 to 09-APR-17 23:55:00 (CST-6)
Location: TAEGESVILLE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief and fast moving tornado developed in association with a
small line of severe thunderstorms in Marathon County. Straight-line wind damage
occurred with the severe thunderstorm in addition to the tornado. Two structures sustained significant storm damage. One had several windows broken and some roofing material ripped off (DI 2, DOD 2 and 3). The other had a garage door blown in and some roof damage (DI 2, DOD 2 and 4). There was minor damage to several others (DI 2, DOD 2). Around 100 mature pine trees were snapped (DI 28, DOD 3 and 4).

Thunderstorm Wind in MARATHON, WISCONSIN
From 09-APR-17 23:39:00 to 09-APR-17 23:39:00 (CST-6)
Location: MANN
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds tore the roof from a mobile home and downed numerous trees.

Hail in LINCOLN, WISCONSIN
From 09-APR-17 17:06:00 to 09-APR-17 17:06:00 (CST-6)
Location: SPIRIT FALLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell near Tripoli.

Hail in MARINETTE, WISCONSIN
From 09-APR-17 17:25:00 to 09-APR-17 17:25:00 (CST-6)
Location: ATHELSTANE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Nickel size hail fell near the Caldron Falls Dam.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:30:00 to 09-APR-17 17:30:00 (CST-6)
Location: CASSIAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail fell north of Tomahawk.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:35:00 to 09-APR-17 17:35:00 (CST-6)
Location: HARSHAW
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail fell at Harshaw.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:45:00 to 09-APR-17 17:45:00 (CST-6)
Location: RHINELANDER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail fell near Rhinelander.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:48:00 to 09-APR-17 17:48:00 (CST-6)
Location: MC NAUGHTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell in Newbold.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:52:00 to 09-APR-17 17:52:00 (CST-6)
Location: RHINELANDER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Penny size hail fell about 4 miles north of Rhinelander.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 17:55:00 to 09-APR-17 17:55:00 (CST-6)
Location: SUGAR CAMP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell at Sugar Camp.

Hail in VILAS, WISCONSIN
From 09-APR-17 22:28:00 to 09-APR-17 22:28:00 (CST-6)
Location: LAC DU FLAMBEAU
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Golf ball size hail fell near Lac du Flambeau, covering the ground.

Hail in VILAS, WISCONSIN
From 09-APR-17 22:30:00 to 09-APR-17 22:30:00 (CST-6)
Location: LAC DU FLAMBEAU
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorms produced quarter size hail and winds estimated at 40 to 45 mph as they passed south of Lac du Flambeau.

Hail in VILAS, WISCONSIN
From 09-APR-17 23:02:00 to 09-APR-17 23:02:00 (CST-6)
Location: CONOVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell at Conover.

Hail in LINCOLN, WISCONSIN
From 09-APR-17 23:08:00 to 09-APR-17 23:08:00 (CST-6)
Location: JERSEY CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail fell near Tomahawk.

Hail in ONEIDA, WISCONSIN
From 09-APR-17 23:30:00 to 09-APR-17 23:30:00 (CST-6)
Location: RHINELANDER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Penny size hail fell west of Rhinelander.