Cold/Wind Chill in Massac, Illinois

A Siberian airmass and an area of high pressure allowed for an extended period of sub freezing temperatures that began on the 19th in the aftermath of a major snowstorm. A northwest wind between 6 to 11 mph and fresh snowpack allowed for wind chills between -5 to -10 beginning late at night into the morning hours of the 20th. The coldest wind chill of locally -11 occurred in Jackson and Saline County. Warming shelters were open in advance as southern Illinois experienced its most dangerous cold temperatures of the season. One fatality due to hypothermia occurred in West City in Franklin County.