(CNN) — A blizzard warning remains in effect in parts of Iowa, Wisconsin and Minnesota where heavy snow caused the roof of the Metrodome in Minneapolis, Minnesota, to collapse, a spokesman for the Minnesota State Patrol said Sunday.
The National Weather Service issued an alert Sunday for parts of the three states and regions along the Mississippi River, warning travelers of hazardous conditions caused by heavy snow, fierce winds and subzero temperatures.
In Minneapolis, the roof of the city’s 64,000-seat football stadium caved in, its iconic dome no longer visible after more than 17 inches of snow blanketed the Twin Cities since Friday.
Concerns about the stadium’s Teflon-covered inflatable dome surfaced Friday night, prompting officials to postpone a football game between the New York Giants and the Minnesota Vikings.
iReport: Treacherous conditions in Minnesota 
The Giants were stranded at Kansas City International Airport in Missouri on Saturday, unable to get to Minnesota because of the snow, said team spokesman Peter John-Baptiste.
A blizzard warning, issued by the National Weather Service, stretched from South Dakota to Wisconsin and down to Missouri and Illinois. The storm was expected to dump between 15 and 20 inches of snow in some locales.
“It’s looking very frightening,” said Amrita Mukherjee of Minneapolis, Minnesota. “It’s terrible. Since morning, it’s been snowing heavily and the wind is really strong. And each hour, it’s getting even worse.”
Scores of roads in Wisconsin, Minnesota and Iowa are closed, according to those states’ transportation departments.
