The polar vortex hit its peak across much of America on Wednesday, with an icy grip that made Arctic Greenland seem like a toasty vacation spot in comparison. Even Mars has been warmer than North Dakota this week.
But there's hope. Some of the coldest parts of the United States are forecast to see as much as a 90-degree warmup early next week, before the expected return of yet another polar plunge of freezing air the first week in March, meteorologists said.
