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Traffic is snarled in Chicago. The city is bracing for three more rounds of snow over the weekend. Image Credit: AP

Chicago: A winter storm that pounded the US midwest region caused at least two deaths on Friday, authorities said, while closing schools and forcing the cancellation of hundreds of flights.

Snow-related crashed snarled highways across southern Michigan, with one person killed when a semitrailer struck the rear of a car stopped in traffic on US 23 near Flint, police said.

A Michigan State Police trooper was hospitalised after a pickup truck lost control and slammed into his stopped squad on Interstate 94 northeast of Detroit. A pileup on the same highway just east of Kalamazoo in southwestern Michigan involved 38 vehicles, including 16 semitrailers, in the eastbound lanes on Friday afternoon, but only minor injuries were reported.

In Naperville, Illinois, just west of Chicago, a man in his 60s died after suffering a heart attack while shovelling snow on Friday morning, Edward Hospital spokesperson Keith Hartenberger told the Chicago Tribune.

The National Weather Service reported at least 25 centimetres of snow on the ground on Friday afternoon in suburban Chicago and 28 centimetres near South Bend, Indiana. Chicago was forecast to receive as much as 35 centimetres of snow with Detroit expecting up to 23 centimetres.

Chicago mayor Rahm Emanuel said the city was gearing up for three more rounds of snow through the weekend.

More than 1,000 flights were cancelled at Chicago’s O’Hare International Airport and more than 300 were cancelled at Midway, the Chicago Department of Aviation reported on Friday afternoon. More than 260 flights were cancelled at Detroit Metropolitan Airport in Romulus, Michigan.

Three northern Indiana counties posted travel watches, recommending only essential travel.

Thousands of children got a snow day after school districts in Chicago, Detroit and Milwaukee cancelled classes. Schools across Nebraska and Iowa also closed or delayed the start of classes.

It made for a great day for children to go sledding, make snow angels and play with pets outside instead of reading, writing and arithmetic. Angela Lekkas took her children sledding in Chicago’s Lincoln Park neighbourhood.

“The kids couldn’t wait to get out today,” she said. “This is the first true snowfall of the season.”

The Indiana Department of Transportation resorted to sending teams of as many as four snow ploughs simultaneously to clear some highways. Chicago Department of Streets and Sanitation Commissioner John Tully said 300 salt-spreading ploughs hit the streets late on Thursday and would continue their work through the weekend.