Winter Storm Watch vs Warning vs Winter Weather Advisory
What each National Weather Service winter alert means, and which ones matter for an HVAC or plumbing shop. ForecastBooked watches these alerts for every ZIP you serve and builds a ready-to-edit kit when a winter storm is on the way.
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The winter alerts, lowest to highest
| Alert | What it means | NWS says |
|---|---|---|
| Winter Weather Advisory | Snow, blowing snow, ice or sleet is expected, but not bad enough to meet warning criteria. Expect winter driving and possible travel trouble. | Be aware. |
| Winter Storm Watch | Conditions are favorable for a significant winter storm: heavy snow, heavy sleet, an ice storm, or heavy snow with blowing snow. | Be prepared. |
| Winter Storm Warning | Issued for a significant winter weather event: snow, ice, sleet or blowing snow, or a mix. Travel may become difficult or impossible. | Take action. |
| Ice Storm Warning | Usually issued for about 1/4 inch of ice or more. Travel becomes dangerous or impossible, and power lines and tree branches are likely to come down. | Take action. |
| Blizzard Warning | Frequent gusts of 35 mph or more with falling or blowing snow, often cutting visibility below 1/4 mile, for 3 hours or more. | Take action. |
From the NWS winter warnings, watches and advisories page, read Oct 21, 2026. Exact criteria vary by local office.
The amount of snow for a warning depends on where you are
Winter alerts come from your local NWS office, and each office uses local criteria. The NWS gives this example: the snow that sets off a Winter Storm Warning in the Northern Plains is usually much higher than the amount needed in the Southeast. If you serve ZIPs in two regions, the same storm can bring a warning in one and an advisory in the other.
Alerts you won't see anymore
Since October 1, 2024, Wind Chill Watches are Extreme Cold Watches, Wind Chill Warnings are Extreme Cold Warnings, and Wind Chill Advisories are Cold Weather Advisories. The NWS said the change makes clear that cold can be dangerous with or without wind. The current NWS alert list also has no Ice Storm Watch or Blizzard Watch. The NWS Winter Storm Watch definition includes an ice storm and heavy snow with blowing snow.
What it means for an HVAC or plumbing shop
A watch is the earlier alert. Conditions are favorable for a significant storm, but it hasn't arrived, so customers still have time to book a furnace check or ask how to protect their pipes. Once a warning is out, the message shifts to staying safe and what to do if something breaks.
Ice storms bring down power lines and tree branches, per the NWS. For a heating customer, that can mean a cold house even when the furnace is fine. Remind them what to do if the power goes out, and how to reach you after the storm.
How ForecastBooked handles it
- Every 3 hours we check the NWS forecast and active alerts for each ZIP you serve.
- Winter storm kit: an active Winter Storm Watch, Winter Storm Warning, Blizzard Warning or Ice Storm Warning for one of your ZIPs.
- Winter Weather Advisories, Extreme Cold and Cold Weather alerts don't start a kit. A hard-freeze kit runs on the forecast instead: a low of 28°F or colder.
- ForecastBooked builds a ready-to-edit kit on your private kit page: a customer email, a text script, a Google post and a social post. You check it and send it to your own opted-in customers.
- Plans are $19, $39, $79 a month by number of ZIPs, after a 14-day free trial. See how triggers work.
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 is issued for a significant winter weather event. The NWS puts it as be prepared for a watch, and take action for a warning.
- Is a Winter Weather Advisory worse than a Winter Storm Warning?
- No. An advisory is the lower level. The NWS issues it when snow, ice or sleet is expected but conditions should not be hazardous enough to meet warning criteria.
- Why did my area get a warning for less snow than another area?
- Each local NWS office issues winter alerts based on local criteria. The NWS gives the example that the snow needed for a Winter Storm Warning in the Northern Plains is usually much higher than in the Southeast.
- Is there an Ice Storm Watch or a Blizzard Watch?
- Not in the current NWS alert list. On Oct 21, 2026, api.weather.gov listed Ice Storm Warning and Blizzard Warning, but no Ice Storm Watch or Blizzard Watch. The NWS Winter Storm Watch definition includes an ice storm and heavy snow with blowing snow.
- What happened to Wind Chill Warnings?
- Since October 1, 2024, the NWS calls them Extreme Cold Warnings. Wind Chill Watches became Extreme Cold Watches, and Wind Chill Advisories became Cold Weather Advisories.
- Which winter alerts start a ForecastBooked kit?
- Winter Storm Watch, Winter Storm Warning, Blizzard Warning and Ice Storm Warning start a winter storm kit for a ZIP you serve. Winter Weather Advisories, Extreme Cold alerts and Cold Weather Advisories don't, but a hard-freeze kit fires on a forecast low of 28°F or colder, with or without an alert. ForecastBooked builds a ready-to-edit kit; you send it to your own opted-in customers.
Cold alerts: Freeze Watch vs Freeze Warning vs Frost Advisory. Pipe risk this week: pipe-freeze checker by ZIP.
Sources
- NWS: winter weather warnings, watches and advisories (storm definitions, read Oct 21, 2026; this page still lists the older Wind Chill alerts)
- NWS Baltimore/Washington (Sterling, VA): warnings defined (current alert names, read Oct 21, 2026)
- NWS: cold hazard simplification (Oct 1, 2024) (read Oct 21, 2026)
- api.weather.gov: alert types (read Oct 21, 2026)
- Data: NOAA/NWS. ForecastBooked is not affiliated with or endorsed by NOAA or the NWS.