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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 3 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.〔http://www.nws.noaa.gov/os/notification/old/pns08cca_winter_weather.txt〕 The Winter Weather Advisories for Snow, for Sleet, for Blowing Snow, and for Snow and Blowing Snow, respectively, have since replaced them. ==Types== Because of the changes with the 2008-09 winter storm season, several varieties have been noted throughout the US. *Winter Weather Advisory for Snow (Replaced the Snow Advisory) *Winter Weather Advisory for Snow and Blowing Snow (Replaced Blowing Snow Advisory, when conditions are not close enough to blizzard to warrant a Winter Storm Warning for Heavy Snow and Blowing Snow) *Winter Weather Advisory for Sleet (Replaced the Sleet Advisory) *Winter Weather Advisory for Sleet and Freezing Rain (or for Freezing Rain and Sleet) (When both the criteria for a WWA for sleet and an Freezing Rain Advisory are met) 〔http://mesonet.agron.iastate.edu/vtec/#2011-O-NEW-KILN-WS-W-0003/USCOMP-N0Q-0〕 *Winter Weather Advisory for Freezing Rain (When the criteria for a Freezing Rain Advisory are met, and some other mentionable winter weather hazards prevent the issuance of a pure freezing rain product) Also to be noted: *Winter Storm Watch is given when a winter storm is likely to occur. *Winter Storm Warning is given when a winter storm is moving into the area and that the public should take protective action. *Also, the generic term, Winter Weather Advisory, may be used on its own, typically to indicate that ''all three'' winter precipitation types are expected in moderate amounts. However, the generic term may be used at the forecaster's discretion regardless of whether or not the condition applies 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Winter Weather advisory」の詳細全文を読む スポンサード リンク
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