EXTREME COLD WARNING: A multi-day episode of very cold wind chills continues throughout northern Alberta, and Environment Canada said wind chill values of minus 40°C or colder are expected to continue into the weekend. Some improvement may occur during the afternoon hours. An extreme cold warning – issued when temperatures or wind chills are forecast to reach levels ranging from minus 30°C to minus 55°C for at least two hours – is currently in effect. On Monday, January 13, cold weather forced cancellation of all public school buses. School buses are cancelled when temperatures dipped to minus 40°C excluding wind chill, or minus 48°C with wind chill.