The mercury plummeted 30 degrees in 10 minutes in Wyoming’s capital Wednesday, and Southeast governors declared states of emergency as much of the U.S. grapples with a historic winter storm.
The temperature in Cheyenne dropped 43 degrees in one hour — a record — on Wednesday, while Denver International Airport saw its biggest one-hour drop, 37 degrees, according to the National Weather Service.
Georgia Gov. Brian Kemp declared a state of emergency before the temperatures plummet into the teens and roads ice over this week.
“Communities across the state are about to see temperatures that they haven’t experienced in a decade or more,” Mr.