Red Flag Warning
A Red Flag Warning also known as a Fire Weather Warning, is a forecast warning issued by
the United States National Weather Service to inform area firefighting and land management
agencies that conditions are ideal for wildland fire ignition, and rapid spread.
After drought conditions, and when humidity is very low, and especially when high or erratic winds which
may include lightning are a factor, the Red Flag Warning becomes a critical statement for
firefighting agencies.
These agencies often alter their staffing and equipment resources dramatically to accommodate the forecast risk. To the public, a Red Flag Warning means high fire danger with increased probability of a quickly spreading vegetation fire in the area within 24 hours.
The weather criteria for fire weather watches and red flag warnings vary with each Weather Service Office’s warning area based on the local vegetation type, topography, and distance from major water sources. They usually include the daily vegetation moisture content calculations, expected afternoon high temperature, afternoon minimum relative humidity and daytime wind speed.
Some things the public can do to be more mindful on Red Flag Warning days per the National
Weather Service, Reno, NV office:
- Safety chains on trailers should be properly secured
- Don’t drive over dry grass or vegetation
- Postpone target shooting
- Avoid yard work or welding near dry vegetation
- Report any fire, smoke or unsafe activity which could lead to a fire
For additional information the status of Red Flag Warnings, please visit the Nevada Weather Service - Reno, Nevada. For information on regulations and ordinances preventing work during red flag warnings, please visit Nevada State Fire Marshal or review the NWS Red Flag Warning Video.