BISMARCK, N.D.—Harsh cold descended on the nation’s midsection Monday as a polar vortex gripped the Rockies and Northern Plains on the heels of weekend storms that pummeled the Eastern U.S. with floods, killing at least 13 people.
The National Weather Service warned of “life-threatening cold” as wind chills dropped to minus 60 Fahrenheit in parts of North Dakota on Monday and minus 50 F in parts of Montana. Tuesday morning was forecast to be even colder.
