The FBI is a numeric value indicating fire danger level. Higher values mean more dangerous conditions. The rating thresholds are: Moderate (12-23), High (24-49), Extreme (50-99), Catastrophic (100+).
Haines Index
Measures atmospheric stability and dryness. High values (5-6) indicate conditions conducive to large fire development and erratic fire behaviour. A flag indicates elevated concern.
Wind Change Danger Index
Indicates the potential danger from wind changes. Higher values mean greater risk from wind shifts that can rapidly change fire direction and intensity.
Mixing Height
The height to which smoke and hot air from fires will rise and mix. Higher mixing heights can lead to more unpredictable fire behaviour.
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