Arctic air plunges south as residents of the Pacific Northwest remain on guard after severe flooding
An arctic air blast is plunging south from Canada, spreading into the northern United States. Meanwhile, residents of the Pacific Northwest are bracing for possible mudslides and levee failures as floodwaters slowly recede. Thousands of people have been evacuated. In the nation's heartland, big cities like Chicago and Minneapolis are preparing for dangerous wind chills. On Saturday, Grand Forks, North Dakota, it felt like minus 36 degrees. The cold air mass is pushing south and east, with winter advisories as far as Alabama and Georgia.
