Starting with an ice and snow storm Thursday, a series of winter systems is forecast to slam parts of the Midwest, Northeast and Mid-Atlantic with dangerous travel conditions through the middle of next week,

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

A storm is expected to bring wintry precipitation to central Pennsylvania from just after midnight until Thursday morning.

A winter storm warning has been issued for four states amid a snow storm that could bring up to 34 inches of snow to some areas on Thursday and Friday. Freezing temperatures may pose health risks, particularly for vulnerable groups such as infants and older adults.

Places to the south of the Great Lakes will see the highest risk of disruptive ice from late on Wednesday into Thursday On the northern side of the storm, the precipitation will mainly be falling as snow but the most dangerous conditions are expected through portions of western Maryland,