When do downslope winds typically occur?

Downslope winds typically occur at night due to the cooling of the air as temperatures drop. As the sun sets and the ground loses heat, the air above the surface cools more rapidly. The cooler, denser air then sinks down the slopes of mountains or hills, creating these winds. This phenomenon is especially prevalent in mountainous regions, where the terrain facilitates the downward movement of cooler air.

In contrast, during the daytime, the sun heats the air, causing it to rise and generating updrafts. This leads to a different wind pattern, making the occurrence of downslope winds less likely. Therefore, nighttime cooling and the resulting air dynamics are key factors that define the occurrence of downslope winds. This understanding is crucial for those studying fire behavior, as downslope winds can significantly affect fire spread and intensity.