Key Terms

Blizzard warning: Issued for sustained or gusty winds of 35 mph or more, and falling or blowing snow creating visibilities at or below a quarter mile; these conditions should persist for at least three hours.

Wind chill advisory: Issued when wind chill temperatures are expected to be a significant inconvenience to life with prolonged exposure, and, if caution is not exercised, could lead to hazardous exposure.

Wind chill warning: Issued when wind chill temperatures are expected to be hazardous to life within several minutes of exposure.

Winter storm warning: Issued when hazardous winter weather in the form of heavy snow, blizzard conditions, heavy freezing rain, or heavy sleet is imminent or occurring. Winter storm warnings are usually issued 12 to 24 hours before the event is expected to begin.

Winter storm watch: Alerts the public to the possibility of a blizzard, heavy snow, heavy freezing rain, or heavy sleet. Winter storm watches are usually issued 12 to 48 hours before the beginning of a winter storm.

Winter weather advisories: Issued for accumulations of snow, freezing rain, freezing drizzle, and sleet, which will cause significant inconveniences and, if caution is not exercised, could lead to life-threatening situations.

It is important to check weather conditions before performing any work outdoors.

To learn more about Cold Stress Safety visit our Cold Stress, Illness & Injury Safety Online Training web page.