Use a watch to get ready. For a warning, delay travel until conditions improve. For a blizzard warning, do not travel. Thresholds vary by region because local NWS offices set them.
| Alert | What it means | What the NWS says to do |
|---|---|---|
| Winter storm watch | Conditions are favorable for a significant winter storm (heavy sleet, heavy snow, ice storm or a combination). | Be prepared. |
| Winter storm warning | A significant event involving snow, ice, sleet or blowing snow. Travel can become difficult or impossible. | Delay travel until conditions improve. |
| Blizzard warning | Frequent gusts of at least 35 mph with falling or blowing snow that reduces visibility to under 1/4 mile for three hours or more. | Do not travel. If travel is unavoidable, carry a winter survival kit. If stranded, stay with your vehicle and wait for help. |
| Ice storm warning | Usually issued for about 1/4 inch or more of ice. Expect dangerous or impossible travel, snapped power lines and falling branches. | Travel is strongly discouraged. |
| Winter weather advisory | Snow, blowing snow, ice or sleet is expected but not hazardous enough to meet warning criteria. | Be prepared for winter driving conditions and possible travel difficulties, and use caution when driving. |
Watches and warnings are local
Local NWS offices issue these products using local criteria, so thresholds vary by region. For example, the snowfall needed for a winter storm warning is much higher in the Northern Plains than in the Southeast. Read the actual alert for your area and time.
Wind chill alerts
A wind chill watch means there is potential for dangerously low wind chill values. A wind chill warning means dangerously low wind chill is expected, which can cause frostbite and hypothermia, and the NWS says to avoid going outdoors if possible. A wind chill advisory means low wind chill is expected but below warning criteria, and you should take precautions against frostbite and hypothermia.
Prepare before the storm
See our guide on what to keep in a winter car kit, and our guide on what to do if you are stranded in snow.
A winter weather advisory is not a minor alert to ignore. It means snow, ice or sleet is expected and driving may be difficult, so use caution.
Check your own location
See current official alerts and the impact for your ZIP code.
Common questions
What is the difference between a winter storm watch and a winter storm warning?
A winter storm watch means conditions are favorable for a significant winter storm. A winter storm warning means a significant event involving snow, ice, sleet or blowing snow is occurring or expected, and travel can become difficult or impossible.
Should I travel in a blizzard warning?
No. In a blizzard warning, do not travel. If you must, carry a winter survival kit. If you get stranded, stay with your vehicle and wait for help.
Sources
Reviewed by the Storm Incoming editorial team on October 26, 2026. Follow local emergency officials if their instructions differ.