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Severe thunderstorms are expected to cross southern Wisconsin later Thursday into early Friday, bringing winds gusting to 60 mph, possible 1-inch diameter hail and heavy rain that may cause localized flooding, according to forecasters.
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Tornadoes are one of the most powerful and violent weather phenomena. Although the details of tornado formation are still being researched, there are a few general steps to their formation.
From the archives: Deadly tornado leveled Barneveld in 1984
Barneveld aerial, 1984
A tornado ripped through Barneveld in the middle of the night on June 8, 1984. In the morning light, it became visible that most of the town had been demolished.
Barneveld car lot, 1984
The Barneveld tornado turned a used car lot into rubble, but the bell tower (in background) remained unscathed.
Lutheran church in Barneveld, 1984
A bell tower survived at the Lutheran church.
Barneveld tornado wreckage, 1984
Barneveld tornado, view of downtown, 1984
An aerial view of the downtown looking south. Highway 18-151 runs in the center of the photo.
Barneveld aftermath, 1984
Barneveld was devastated by a tornado that killed nine, injured scores and damaged 90 percent of the town's buildings.
Barneveld tornado rescue, 1984
Barneveld tornado devastation, 1984
Barneveld tornado, 1984
Barneveld power line, 1984
Barneveld aerial view, 1984
Aerial photo of Barneveld, Wis. after a tornado leveled the town in June of 1984.
Barneveld damage, 1984
Barneveld lay in ruins after a tornado leveled the town in June 1984.
Barneveld tornado aerial, 1984
A scene of devastation greets the dawn in Barneveld the morning of June 8, 1984, after a monster tornado roared through after midnight.
Barneveld town meeting, 1984
A town meeting begins with people holding hands and the Rev. Bob Twiton and the Rev. Jann Weaver leading them in prayer.
Arneson home, 1984
Lois Arneson is comforted by a friend, Doug Carden, while her husband, Carl, shows the strain of the long day. Their house is behind.
Sweep through town, 1984
Just after dawn on June 8, 1984, rescue workers begin a second sweep of Barneveld to see if anyone else had been injured or killed in the F5 tornado. Nine people died and some 100 were injured.
Barneveld tornado wreckage, 1984
Barneveld tornado devastation, 1984
Barneveld power line, 1984
Sweep through town, 1984
Just after dawn on June 8, 1984, rescue workers begin a second sweep of Barneveld to see if anyone else had been injured or killed in the F5 tornado. Nine people died and some 100 were injured.
Barneveld tornado wreckage, 1984
Barneveld aftermath, 1984
Barneveld was devastated by a tornado that killed nine, injured scores and damaged 90 percent of the town's buildings.
Barneveld tornado, 1984
Barneveld tornado aerial, 1984
A scene of devastation greets the dawn in Barneveld the morning of June 8, 1984, after a monster tornado roared through after midnight.
Sweep through town, 1984
Just after dawn on June 8, 1984, rescue workers begin a second sweep of Barneveld to see if anyone else had been injured or killed in the F5 tornado. Nine people died and some 100 were injured.

