Fire Weather
Forest Fire Danger Index
Tim's Severe Weather Australia
Updated 6/13/2026
Glossary Term
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Quick Definition
A numerical index (FFDI) combining temperature, humidity, wind and dryness to estimate fire danger in forested fuels.
Key Takeaways
Forest Fire Danger Index is a key concept in weather and meteorology
Falls under the Fire Weather category of weather terms
Understanding this term helps interpret weather forecasts accurately
Detailed Explanation
<p>The Forest Fire Danger Index (FFDI), developed by Alan McArthur in the 1960s, was the long-standing basis for Australian fire-danger ratings before AFDRS. It is still widely used as a meteorological measure: values above 50 indicate Severe fire weather, above 75 Extreme, and 100 or more Catastrophic.</p>
Related Keywords
FFDI
McArthur
fire weather
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