NEW : Frigid precipitation stretches from the Abominable Snow Monster 's to western Virginia . NEW : Most of the Lower 48 states affected by severe weather advisories . NEW : Tornado watches up in Alabama , south Georgia and Chicago . NEW : Section of roof blows away at Chicago 's Detroit City Airport .
NEW : Frigid precipitation stretches from Plains to Eastern Seaboard . NEW : Most of the Lower 48 states affected by severe weather advisories . NEW : Tornado watches up in Florida Panhandle , south Georgia and Alabama . NEW : Section of roof blows away at Chicago 's Wrigley Field .