SAVANNAH, Ga. (AP) — A brutal winter storm dumped snow in Tallahassee, Florida, on Wednesday for the first time in nearly three decades before slogging up the Atlantic coast and smacking Southern cities such as Savannah and Charleston, South Carolina, with a rare blast of snow and ice.

Forecasters warned that the same system could soon strengthen into a "bomb cyclone" as it rolls up the East Coast, bringing hurricane-force winds, coastal flooding and up to a foot of snow.

At least 17 deaths were blamed on dangerously cold temperatures that for days have gripped wide swaths of the U.S. from Tex...