Mixed rain and snow Sunday; watch for icy spots Details >
Dec 4, 2013; 6:29 AM ET Cold air from the Northern Plains will eventually reach the East Coast, but it won't happen at once.
Austin Mahone, Icona Pop, and Avril Lavigne and more rocked the red carpet at Philadelphia's annual pop music festival.
A swath of ice and a wintry mix later this week threatens to slow travel and cut power from parts of Texas to Kentucky.
A swath of snow and wintry mix with slippery travel will develop from St. Louis to Albany, N.Y., prior to the weekend.