Kansas City International Airport, for example, has an 85% chance of snowfall exceeding .1 of an inch, according to data from the weather service. The probability of higher snowfall totals drops rapidly, with only a 50% chance of snowfall exceeding 1 inch. The chance of 2 inches or more of snow is less than 10%.

A powerful winter storm that unleashed heavy snowfall and coated roads with ice across much of Texas and Oklahoma has pushed into the South, leading governors to declare states of emergency and prompting widespread school closures.