What is the general behavior of fire on South slopes as compared to North slopes?

Fires on South slopes experience higher rates of spread due to several environmental factors. South-facing slopes in the Northern Hemisphere receive more direct sunlight throughout the day, leading to warmer and drier conditions. This increased solar radiation promotes a lower moisture content in both the soil and the vegetation, causing fuels to become more susceptible to ignition and combustion. As a result, when a fire ignites on a South slope, the combination of drier and warmer conditions tends to facilitate a faster rate of fire spread.

Conversely, North slopes generally receive less direct sunlight, often resulting in cooler temperatures and higher moisture levels. This environmental difference can lead to slower rates of fire spread in comparison to South slopes. Understanding these dynamics is critical for fire management and firefighting strategies, as they significantly influence fire behavior and the potential for rapid fire growth.