polar vortex, cold and arctic

Louisiana is forecasted to have a potential winter storm bringing a surge of cold air late Sunday into early next week.
People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...
A polar vortex that hit much of the U.S. with ice and snow has dealt a glancing blow to Florida and its manatee population.
Winter weather is aiming at Delaware again. Where the snow will hit is the biggest question. Here's what we know.
A polar vortex that has hit much of the U.S. with ice and snow has dealt a glancing blow to Florida and its manatee ...