`` The coldest outbreak of arctic air '' since this weekend may threaten Gulf Coast . Meanwhile , a Canadian cold front will drop over the Great Plains to the Gulf of Mexico by Sunday morning , the service projected . Snow , freezing rain will fall in Northern Rockies , the Great Plains , toward Northern Plains . Tornadoes could hit New England as rains should soak Southeast .
`` The coldest outbreak of arctic air '' since this weekend may threaten Gulf Coast . Snow , freezing rain will fall in Northern Rockies , the Great Plains , toward Northern Plains . Tornadoes could hit New England as rains should soak Southeast .