Blizzard Watch
A Blizzard Watch is an advisory issued by the National Weather Service of the United States which means winds greater than 35 miles per hour (30 kn; 56 km/h), mixed with falling or blowing snow, and visibilities of 1⁄4 mile (0.4 km) or less is forecast for a period of 3 hours or more. A blizzard watch is issued 12 to 48 hours before an expected blizzard event. As the forecast solidifies, a blizzard watch will either be downgraded to a Winter Storm Warning or Winter Weather Advisory for blowing snow (depending on accumulation amounts) or upgraded to a Blizzard Warning.
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