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Winter storm watch
A winter storm watch is a warning in the United States issued by the National Weather Service when there is a possibility of heavy snow or potential of significant ice accumulations at least 24 hours before a storm that has a risk of being hazardous.
The watch is typically issued 12 to 48 hours before the storm's expected arrival in the given area.
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.[citation needed]
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 storm fades. Generally, a watch is not issued when only advisory-level conditions are expected. Watches generally go into effect when the chance of meeting warning criteria ranges from 50% to 80% of snow.
The following is an example of a Snowstorm Watch issued by the National Weather Service Office in Pleasent hill,MO
URGENT - WINTER WEATHER MESSAGE National Weather Service Hanford CA 150 AM PDT Mon Apr 20 2026
CAZ323-326>328-330-201715- /O.CON.KHNX.WS.A.0004.260421T0900Z-260423T0000Z/ Yosemite NP outside of the valley-Upper San Joaquin River-Kaiser to Rodgers Ridge-Kings Canyon NP-Sequoia NP- Including the cities of Wawona, Shaver Lake, Lake Thomas Edison, Cedar Grove, Devils Postpile, Tuolumne Meadows, Florence Lake, Lodgepole, Huntington Lake, Giant Forest, and Lake Wishon 150 AM PDT Mon Apr 20 2026
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY AFTERNOON...
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Winter storm watch
A winter storm watch is a warning in the United States issued by the National Weather Service when there is a possibility of heavy snow or potential of significant ice accumulations at least 24 hours before a storm that has a risk of being hazardous.
The watch is typically issued 12 to 48 hours before the storm's expected arrival in the given area.
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.[citation needed]
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 storm fades. Generally, a watch is not issued when only advisory-level conditions are expected. Watches generally go into effect when the chance of meeting warning criteria ranges from 50% to 80% of snow.
The following is an example of a Snowstorm Watch issued by the National Weather Service Office in Pleasent hill,MO
URGENT - WINTER WEATHER MESSAGE National Weather Service Hanford CA 150 AM PDT Mon Apr 20 2026
CAZ323-326>328-330-201715- /O.CON.KHNX.WS.A.0004.260421T0900Z-260423T0000Z/ Yosemite NP outside of the valley-Upper San Joaquin River-Kaiser to Rodgers Ridge-Kings Canyon NP-Sequoia NP- Including the cities of Wawona, Shaver Lake, Lake Thomas Edison, Cedar Grove, Devils Postpile, Tuolumne Meadows, Florence Lake, Lodgepole, Huntington Lake, Giant Forest, and Lake Wishon 150 AM PDT Mon Apr 20 2026
...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY AFTERNOON...