What is Wind chill advisory?

A wind chill advisory is a hazardous weather statement issued by Weather Forecast Offices of the National Weather Service in the United States to alert the public that wind chills are forecast to reach values low enough that it poses a threat to human health and life if adequate protection is not taken against hypothermia and frostbite. The exact criteria meriting the issuance of an advisory varies from state to state, and areas prone to colder temperatures will often require the wind chill to be lower before issuing an advisory.