Which cloud type is most closely associated with standing waves produced by wind flowing over mountainous terrain?

Which cloud type is most closely associated with standing waves produced by wind flowing over mountainous terrain?

• A. Lenticular clouds
• B. Mammatus clouds
• C. Cirrus
• D. Stratocumulus

Answer: (A)

Standing mountain waves occur when stable air flows over a mountain barrier, setting up a series of vertical oscillations in the lee. When the air is moist enough, the crests of these waves cool to the dew point and condense, forming lenticular clouds. These lens-shaped clouds often line up downstream of the mountains and can appear stationary relative to the terrain, signaling an active mountain-wave pattern and potential turbulence at the wave crests. This makes lenticular clouds the cloud type most closely tied to wind flowing over mountains. Mammatus clouds form from sinking air beneath strong thunderstorm anvils and aren’t related to mountain waves. Cirrus clouds are high, wispy ice crystals that don't indicate standing wave activity. Stratocumulus clouds are low, layered formations from general atmospheric stratification rather than the wave-induced processes produced by terrain.

Standing mountain waves occur when stable air flows over a mountain barrier, setting up a series of vertical oscillations in the lee. When the air is moist enough, the crests of these waves cool to the dew point and condense, forming lenticular clouds. These lens-shaped clouds often line up downstream of the mountains and can appear stationary relative to the terrain, signaling an active mountain-wave pattern and potential turbulence at the wave crests. This makes lenticular clouds the cloud type most closely tied to wind flowing over mountains.

Mammatus clouds form from sinking air beneath strong thunderstorm anvils and aren’t related to mountain waves. Cirrus clouds are high, wispy ice crystals that don't indicate standing wave activity. Stratocumulus clouds are low, layered formations from general atmospheric stratification rather than the wave-induced processes produced by terrain.