The National Weather Service has issued a Wind Chill Advisory for the greater Capital Region and Mid-Hudson Valley, including western Columbia, Greene and Ulster counties 5 p.m., Wed., Jan. 7 through 10 a.m., Thurs., Jan. 8. Dangerously low cold wind chill values as low as 15 to 25 below zero are expected. The combination of cold temperatures and brisk northwesterly winds will combine to create dangerously cold conditions. Without considering the wind, temperatures are expected to fall below zero in many area overnight.