Blizzard warning

A Blizzard Warning (SAME code: BZW) is an advisory issued by the National Weather Service of the United States which means sustained winds or frequent gusts of 35 mph / 15 m/s or greater with heavy snow is forecast for a period of 3 hours or more. A blizzard tends to reduce visibilities to 1/4 of a mile (400 m) or less. A Severe Blizzard Warning is a variation issued in some cases of winds above 45 mph / 20 m/s and temperatures below 10 °F/-12 °C. Most local weather offices will activate and broadcast the SAME alarm tone on relevant NOAA Weather Radio stations for both varieties of warning.

In Canada, comparable warnings are issued by Environment Canada. These are the main two types of Canadian blizzard warnings as of 2010:

The same warnings are issued by Weatheradio Canada and re-issued by media outlets like The Weather Network.

The following is an example of a Blizzard Warning issued by the National Weather Service Office in Upton, New York.

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