Wind chills in the minus 30s are expected overnight Sunday and Monday morning. Temperatures are forecast to drop into the minus 20s overnight and early Monday morning. Light to moderate winds will combine with these cold temperatures to give wind chill values into the minus 30s.
Frostbite (damage, sometimes permanent, to skin and body tissue due to freezing) and hypothermia (a life threatening drop in body temperature) will occur if adequate precautions are not taken when outdoors. These can occur within minutes.