The differences between Red Flag conditions and Elevated Fire Danger from the National Weather Service.
Red Flag Conditions
All of the following criteria must be met to be considered Red Glag Conditions (plus discussion with Land Management Officials)
- Sustained winds averaging greater than or equal to 20 mph for at least 3 hours AND
- Relative humidity greater than or higher than 25% AND
- 10 hour fuels (grass, brush, etc) less than or equal to 8% (Indiana and Ohio only) OR air temperature 75 degrees or greater (Michigan only)
In these situations, a Fire Weather Watch or Red Flag Warning is issued.
Elevated Fire Danger
Covers those “borderline” situations where ALL criteria are not met, but the fire danger still exists.
Examples include:
- Relative humidity 25-35%
- Sustained winds more variable (15 to 20 mph with gusts to 30 mph)
In these situations, we utilize the following to highlight the danger:
- Special Weather Statements
- Hazardous Weather Outlook
- Weather Story
- Social Media Posts
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