A blanket of snow swept the eastern half of the continental U.S. Wednesday after more than 90 million Americans were under winter weather advisories or warnings.

At least 4-8 inches of snow fell across eastern Iowa, southern Wisconsin, northern Illinois and the Lower Peninsula of Michigan, according to the National Weather Service.

AccuWeather forecasters warned Chicago, Detroit and Kansas City, Missouri would be the hardest hit areas by a second major storm set to strike this week.

The first storm brought just over 6 inches of snow at Ronald Reagan Washington National Airport and 12 inches in parts of Virginia and West Virginia.

AccuWeather warned the second storm would cause snow to span nearly 2,000 miles, from Colorado to Michigan and New England through Wednesday and Thursday. Several inches of snow are also forecast in Washington, D.C. and in Maine.

Sub-zero temperatures reached the northern and central Plains overnight, with the weather service reporting temperatures between -20 to -30 degrees in North Dakota. On Thursday, heavy rainfall in the Southeast will forge severe flash flooding risks across Georgia into South Carolina and northern Florida, the weather service reported.

Here's how much snow has fallen near you and what to expect Thursday.

You can use the USA TODAY snowfall accumulation map to see how much snow has fallen near you.

The map below shows the probability that an area could receive more than 4 inches of snow. Use the slider at the top left to toggle by day. You can see the full version of the forecast using the USA TODAY winter weather forecast tracker.

National weather radar

Contributing: John Bacon, Gabe Hauari, Christopher Cann and Minnah Arshad

This article originally appeared on USA TODAY: How much did it snow? Track totals, maps for winter storm