Fire Weather Index Calculator

Calculate Fire Weather Index



Formula

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

\[ FWI = 0.434 \cdot \ln(ISI) + 0.537 \cdot \ln(BUI) - 1.233 \]

Where:

Definitions

Example

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

\[ FWI = 0.434 \cdot \ln(10) + 0.537 \cdot \ln(20) - 1.233 \]

We get:

\[ FWI \approx 1.38 \]

So, the Fire Weather Index is approximately 1.38

Extended information about "Fire-Weather-Index-Calculator"

Fire Weather Index (FWI)

Definition: The Fire Weather Index (FWI) is a numerical rating of fire intensity based on weather conditions.

Formula: \( \text{FWI} = \text{ISI} \times \text{BUI} \)

Example: \( \text{FWI} = 10 \times 20 \)

Fire Danger Index Calculator

Definition: The Fire Danger Index (FDI) is a measure of the potential for fire spread and intensity.

Formula: \( \text{FDI} = \text{FWI} \times \text{Wind Speed} \)

Example: \( \text{FDI} = 200 \times 15 \)

Rate of Fire Calculator

Definition: The rate of fire is the speed at which a fire spreads.

Formula: \( \text{Rate of Fire} = \frac{\text{Distance}}{\text{Time}} \)

Example: \( \text{Rate of Fire} = \frac{500}{2} \)

Global Fire Weather Index

Definition: The Global Fire Weather Index (GFWI) is a measure of fire potential based on global weather conditions.

Formula: \( \text{GFWI} = \text{FWI} \times \text{Global Factor} \)

Example: \( \text{GFWI} = 150 \times 1.2 \)