National Weather Service United States Department of Commerce
 
  • Red Flag Warning: Take Action. Be extremely careful with open flames. NWS issues a Red Flag Warning, in conjunction with land management agencies, to alert land managers to an ongoing or imminent critical fire weather pattern. NWS issues a Red Flag Warning when fire conditions are ongoing or expected to occur shortly.
  • Fire Weather Watch: Be Prepared. A Watch alerts land managers and the public that upcoming weather conditions could result in extensive wildland fire occurrence or extreme fire behavior. A watch means critical fire weather conditions are possible but not imminent or occurring.
  • Extreme Fire Behavior: This alert implies a wildfire likely to rage of out of control. If is often hard to predict these fires because such they behave erratically, sometimes dangerously.One or more of the following criteria must be met:
    • Moving fast: High rate of spread
    • Prolific crowning and/or spotting
    • Presence of fire whirls
    • Strong convection column