A wind chill advisory was issued by the National Weather Service on Saturday at 3:24 a.m. valid for Sunday between midnight and 9 a.m. for Choctaw, Washington, Clarke, Wilcox, Monroe, Conecuh, Butler, Crenshaw and Covington counties.

According to the weather service, “You are urged to stay indoors until conditions improve. If you must go outside, several layers of clothes will keep you warmer than a single heavy coat. A hat is also important as half your body heat loss can be from the head.”

Advance Local Weather Alerts is a service provided by United Robots, which uses machine learning to compile the latest data from the National Weather Service.