Wildland Firefighting Practice Exam

Where do the majority of whirlwinds observed by firefighters typically occur?

1. Leeward sides of ridges, near the bottom

2. Windward sides of ridges, near the top

3. Leeward sides of ridges, near the top

4. Windward sides of ridges, near the bottom

The correct answer is: Leeward sides of ridges, near the top

The majority of whirlwinds observed by firefighters typically occur on the leeward sides of ridges, near the top. This phenomenon is largely due to the behavior of wind as it interacts with topographical features. When wind flows over a ridge, it can create turbulent air patterns on the leeward side due to the downward flow of air. This often results in the formation of whirlwinds in this specific area. Ridges can significantly influence wind dynamics, and when the wind descends from the peak of the ridge, it loses its energy. The combination of reduced wind speed and the upward motion of warm air generated from the heat of the fire contributes to the development of these whirlwinds. These whirlwinds can lead to unpredictable fire behavior, making it crucial for firefighters to be aware of their locations and potential impacts while managing wildfires. Understanding this dynamic is essential for safety and effective firefighting strategy, as whirlwinds can carry embers and heat into new areas, complicating firefighting efforts.