Fire Weather Index Calculator

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:

Fire Weather Index (FWI): A meteorological tool used to estimate the risk or danger of wildfires in a specific area. It takes into account various factors such as temperature, humidity, wind speed, and recent rainfall to calculate the potential intensity of a wildfire.

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