A winter storm that brought snow, sleet and freezing rain to a large swath of the Midwest swept into the mid-Atlantic and Northeast on Thursday, causing treacherous travel conditions, prompting school delays and closures and potential power outages for millions of Americans.

Winter weather advisories for all 21 counties are in effect with ice and up to 3 inches of snow possible in spots.

Of all the precipitation types, freezing rain is by most measures the worst because it can weigh heavily on trees and power lines.

Snow, freezing rain and ice are likely Wednesday in the Lansing area, and driving could become hazardous by Wednesday night, forecasters said.

Rain is next on our weather radar for Indianapolis with possible thunderstorms and freezing rain tonight. Here's what you can expect in Indianapolis.

Forecasters are warning of possibly significant ice accumulations in several mid-Atlantic states that could cause widespread power outages and disrupt travel

Storms spawned at least one tornado, sent creeks over their banks and caused flash flooding Thursday in portions of West Virginia and Kentucky, while a wintry mix coated trees and roads in ice and even dropped “thunder ice” in several states.