A Code Blue Weather Emergency goes into effect at noon on Friday, November 21st for all of Montgomery County.
It will end at noon on Monday, November 24th.
A Code Blue alert goes out when winter conditions pose a threat of serious harm or death to people who don't have shelter.
A Code Blue in this case means the air temperature and wind chill factor combined, will make it 20 degrees or below, which is dangerously cold.
