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A winter storm watch is issued by the National Weather Service of the United States when there is a possibility of heavy snow or potential of significant ice accumulations, without meeting a specific other winter criteria. The watch is typically issued 12 to 48 hours before the storm's expected arrival in the given area.[1] The criteria for this watch can vary from place to place, which is true with other winter weather warning and advisories.[citation needed]
As the event of the storm draws nearer in time and confidence in the occurrence of significant winter weather conditions and accumulation is increased, the weather watch will be upgraded to a winter storm warning or blizzard warning, depending on whether blizzard conditions will be met. If there is considerable confidence in significant ice accumulations with little to no snow, the watch will be upgraded to an ice storm warning. When confidence increases in the occurrence of winter like conditions that are not expected to reach warning or other winter criteria, a winter weather advisory will be issued instead. A watch could be discontinued altogether if neither warning nor advisory-level conditions are expected to be met and when the possibility of a winter storms fade. Generally, a watch is not issued when only advisory-level conditions are expected.[2][3] Watches generally go into effect when the chance of meeting warning criteria ranges from 50% to 80% of snow.[3]
^Service, US Department of Commerce, NOAA, National Weather. "Watch/Warning/Advisory Definitions". www.weather.gov. Retrieved 2016-10-27.{{cite web}}: CS1 maint: multiple names: authors list (link)
^Page, NWS Winter Storm Watches and its Warnings; Service, US Department of Commerce, NOAA, National Weather. "NWS Winter Storm Watches and Warnings Home Page". www.nws.noaa.gov. Retrieved 2016-10-27.{{cite web}}: CS1 maint: multiple names: authors list (link)
^ abService, US Department of Commerce, NOAA, National Weather. "National Weather Service Expanded Winter Weather Terminology". www.weather.gov. Retrieved 2016-10-27.{{cite web}}: CS1 maint: multiple names: authors list (link)
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