# What a Red Flag Warning and a Fire Weather Watch mean Published November 9, 2026, 12:01 AM ET By Ryan Hall, Y'all Written by our automated news desk from National Weather Service data. A Fire Weather Watch means critical fire weather conditions are possible but not imminent or occurring. A Red Flag Warning means there is high confidence that local Red Flag criteria will be met within 48 hours or are already being met. Local offices set the criteria with land managers, combining dry fuels with weather such as strong wind, very low humidity, lightning or dry thunderstorms. ## Key points - **Fire Weather Watch:** a high potential for a Red Flag event, flagged ahead of time. Be prepared. - **Red Flag Warning:** a high degree of confidence that Red Flag conditions are happening or will happen within 48 hours or less. Take action. - **The ingredients:** dry fuels (grass, brush, trees) plus weather that spreads fire, such as strong wind, very low humidity or dry thunderstorms. - **The rules are local:** each National Weather Service office sets its Red Flag criteria with the land management agencies in its area, so there is no single national number. A Red Flag Warning means the weather and the dryness of the fuels are lined up for extreme fire danger, either right now or within the next 48 hours. A Fire Weather Watch is the heads-up before that: the setup looks likely, but it isn't here yet. Both are the National Weather Service's own definitions, and both are about how easily fires start and how hard they are to control. ## Fire Weather Watch A Watch goes out when there is a high potential for a Red Flag event, 18 to 96 hours before the conditions are expected to begin. That gives people at least a day of lead time. A Watch is not a hedge. It is not issued for low confidence or borderline conditions. It means critical fire weather is possible but not imminent or occurring. The upcoming weather could lead to extensive wildland fire or extreme fire behavior, and the Watch tells land managers and the public to get ready. ## Red Flag Warning A Warning is the next step up. It means there is a high degree of confidence that weather and fuel conditions meeting the local Red Flag criteria will occur in 48 hours or less. It also covers conditions that are already happening. The point of the Warning is the combination of fuels and weather. Together they can support widespread new fires starting, or problems controlling fires that are already burning. Either one could threaten life and property. The Warning is issued in conjunction with land management agencies when those conditions are ongoing or expected shortly. Once in a while, local criteria are greatly exceeded or near record levels. When that happens, the office says so in the headline and text of the warning, sometimes calling it a particularly dangerous situation. It is still a Red Flag Warning. It just carries stronger wording. ## Who sets the criteria and what goes into them Red Flag criteria are local. Each National Weather Service office works them out with the land management agencies in its area, because what counts as critical in one landscape may not in another. Two places can both be under a Red Flag Warning for different weather. The criteria pair two things: - **How dry the fuels are.** The criteria consider the dryness of grass, brush and trees. - **Weather that pushes fire along or starts it.** That can be lightning, a significant dry cold front, strong winds, very low relative humidity, or dry thunderstorms. Dry fuels alone don't trigger the alert, and neither does wind alone. It is the pairing that matters. ## What to do **Fire Weather Watch: be prepared.** You have at least a day's notice. Use it to get ready. **Red Flag Warning: take action.** Be extremely careful with open flames. The combination of fuels and weather can support widespread new fires or problems controlling fires already burning. Because the criteria are local, read the alert for your area. You can also sign up for free [Y'all Alerts](/alerts) to get notified. To see which of these alerts are active right now, check our [live warnings](/warnings). More on: [Weather explainers](https://ryanhallyall.com/news/topic/weather-explainers) ## Sources - [NWS Instruction 10-401, "Fire Weather Services Product Specification" (August 25, 2025), section 3](https://www.weather.gov/media/directives/010_pdfs/pd01004001curr.pdf), NOAA National Weather Service, issued August 24, 2025, 8:00 PM ET - [NWS safety page "Understanding Wildfire Warnings, Watches and Behavior"](https://www.weather.gov/safety/wildfire-ww), NOAA National Weather Service - [NWS Glossary, "Red Flag Warning"](https://forecast.weather.gov/glossary.php?word=red%20flag%20warning), NOAA National Weather Service --- Canonical: https://ryanhallyall.com/news/what-a-red-flag-warning-means From Ryan Hall, Y'all (https://ryanhallyall.com). Always follow official warnings from the National Weather Service.