Dangerously cold conditions are forecast tonight through Tuesday morning. Cold Weather Advisories and a Warning (Fallon County) have been issued for tonight, with wind chills of -20 to -45F forecast. Actual air temperatures tonight will drop to -15 to -30 degrees, with locally colder possible in low lying areas and along river valleys. Limit outdoor exposure and dress in layers. In these conditions, frostbite and hypothermia can occur on exposed skin in a matter of minutes.