A Winter Weather Advisory is issued by the National Weather Service of the United States when a low pressure system produces a combination of winter weather (snow, freezing rain, or sleet) that presents a hazard, but does not meet warning criteria. A Winter Weather Advisory is similar to significant weather advisory, but a winter weather advisory is an official product. A similar warning is issued by Environment Canada's Meteorological Service of Canada offices.
The advisory criteria vary from area to area. For example, any measurable snow will constitute the advisory in Florida, while up to 5 inches will do so in New England. If other forms of wintry precipitation are expected, then a Winter Weather Advisory or winter storm warning can be issued, also depending on the amount of precipitation that is expected.
Prior to the 2008-09 winter storm season, there was the Snow Advisory, specific for when snow was the only hazard expected in the advised area, the Sleet Advisory, specific for when sleet was the only hazard expected in the advised area, the Blowing Snow Advisory, specific for when blowing snow was the only hazard expected in the advised area, and the Snow and Blowing Snow Advisory, specific for when snow and blowing snow were the only hazards expected in the advised area. The Winter Weather Advisories for Snow, for Sleet, for Blowing Snow, and for Snow and Blowing Snow, respectively, have since replaced them.
Read more about Winter Weather Advisory: Types
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