The impending arrival of a major winter storm has much of the U.S. playing the waiting game – waiting for snow, ice, frigid temperatures and possible power outages.

A severe winter storm is expected to bring a glaze of ice, dangerously cold temperatures, and potentially a foot of snow to Oklahoma City over the weekend.

More than 800 flights within, into, or out of the US were already delayed or cancelled on Friday in advance of the storm, including at airports in Dallas, Atlanta and Oklahoma, according to the flight...