Thursday winter weather forecast: What to know as snow is forecast from Minnesota to Maine

More than 24 million Americans were under a winter weather advisory Thursday as a snowstorm that hammered Denver with the biggest two-day snowfall in more than 30

years slowly pushed eastward. "Winter storm continues for the Upper Midwest (and) Great Lakes Thursday with heavy, blowing snow leading to dangerous travel

conditions," the National Weather Service's Weather Prediction Center said in a statement.   Additional snowfall totals of around 6-12 inches are forecast for

portions of the Upper Great Lakes, with locally higher totals over a foot possible, the statement said. Much of the snowfall is expected to occur over a period of a few hours,

with snowfall rates of 1-2" per hour and gusty winds "making travel difficult to impossible." Start the day smarter. Get all the news you need in your inbox each

morning. Some sleet and a glaze of freezing rain may mix in for some areas, generally from central Wisconsin into the northern Lower Peninsula of Michigan, the

weather service said. The snow will begin to taper off from west to east through early Friday morning. Other weather developments: ►Sections

of I-70 in Colorado remained closed Thursday after a pileup involving nine semi-trucks and 12 passenger vehicles on Wednesday shut down a 160-mile stretch of the interstate in

both directions from Aurora to the Kansas state line.