A Red Flag Warning is a term used by fire-weather forecasters to call attention to limited weather conditions that may result in extreme burning conditions. Red Flag criteria occurs whenever a geographical area has been in a dry spell for a week or two, or for a shorter period , if before spring green-up or after fall color, and the National Fire Danger Rating System (NFDRS) is high to extreme.
A Red Flag Warning is issued during an on-going fire event or when the fire weather forecaster has a high degree of confidence that Red Flag criteria will occur within 24 hours.
