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Fire Weather Index Calculator

Calculate Fire Weather Index



Formula

The formula to calculate the Fire Weather Index (FWI) is:

FWI=0.434ln(ISI)+0.537ln(BUI)1.233

Where:

Definitions

Example

Let's say the Initial Spread Index (ISI) is 10, and the Buildup Index (BUI) is 20. Using the formula:

FWI=0.434ln(10)+0.537ln(20)1.233

We get:

FWI1.38

So, the Fire Weather Index is approximately 1.38