Thousands of flights have been canceled, including more than 400 out of Atlanta’s Hartsfield-Jackson airport – the nation’s busiest airport – where a ground delay has been issued.

A significant winter storm is ongoing Friday morning across the South after producing snowy and icy weather in the Dallas Metroplex and the southern Plains.

The winter storm that knocked out power and brought plunging temperatures to other parts of the country moves into metro Atlanta and north Georgia this weekend, and state officials are urging residents to avoid unnecessary travel.