(Corrects typo "we're" in 12th paragraph)

By Mary Wisniewski

WASHINGTON, Ill., Nov 17 (Reuters) - A fast-moving storm system triggered multiple tornadoes on Sunday that killed at least five people and flattened large parts of a town in Illinois as it tore across the Midwest, authorities said.

The storm also forced the Chicago Bears to halt their game against the Baltimore Ravens and the NFL fans at Soldier Field to seek shelter as menacing clouds rolled in. Chicago's two major airports briefly stopped traffic while the metropolitan area was under a tornado watch.

A National Weather Service survey team confirmed preliminary EF-4 tornado damage in Washington County in southern Illinois, with winds of 166 to 200 miles (267-322 km) per hour.

A small farmhouse there took a direct hit, according to the NWS survey team report. "The homestead was totally destroyed with only the foundation remaining," the NWS report said.

A total of 80 tornado reports were received along with 358 reports of damaging winds and 40 reports of large hail, according to Rich Thompson, a lead forecaster with the weather service's Storm Prediction Center in Norman, Oklahoma.

The storm moved dangerously fast, tracking eastward at 60 miles per hour (97 kph) and Thompson said the bulk of the tornado damage from the storm occurred over a period of about five hours.

"We'll still have a wind damage threat across Pennsylvania and New York into the overnight hours," Thompson said late on Sunday.

Sunday night, along with about 100,000 Michigan residents, due to storm-related outages, according to utility providers.

About 50,000 outages were also reported in Indiana and some 3,000 people were without power in Kentucky.

DEVASTATION

The town of Washington, Illinois, 145 miles (233 km) southwest of Chicago, was hit especially hard by the tornadoes that Thompson said had ripped through Indiana and Kentucky as well as Illinois and a small corner of Ohio.

"It's a sad day in Washington. The devastation is just unbelievable," said Washington Mayor Gary Manier.

"I can't imagine people walked away from these places. Some people were sitting in their living rooms. They stayed but their house left," Manier later added.

Manier said hundreds of homes had been destroyed in the town of 15,000 people.

The state Emergency Management Agency said one person was killed in Washington. Thirty-one people injured by the storm were being treated at St. Francis Medical Center, one of the main hospitals in nearby Peoria, according to hospital spokeswoman Amy Paul. Eight had traumatic injuries.