FAA Part 107 Remote Pilot (UAG)WeatherMedium
During a pre-flight weather briefing, a pilot notices towering cumulus (TCU) clouds building rapidly to the west of the operating area. What is the primary concern this cloud type presents?
- ATowering cumulus are associated exclusively with reduced visibility from ground fog
- BTowering cumulus indicate stable air and pose minimal hazard to operations
- CTowering cumulus indicate the potential for rapid development into thunderstorms with turbulence and wind shear
- DTowering cumulus typically only produce light, steady drizzle with no turbulence
Show answer & explanationAnswer & explanation
Correct answer: C. Towering cumulus indicate the potential for rapid development into thunderstorms with turbulence and wind shear
Towering cumulus (TCU) clouds represent clouds of vertical development driven by strong, unstable updrafts. They are a precursor stage to cumulonimbus (thunderstorm) clouds and signal the potential for rapidly developing turbulence, gusty winds, wind shear, and lightning as the cell matures.
Why the other options are wrong
- A. TCU form aloft from convective lifting and are unrelated to ground fog formation.
- B. TCU clouds form from strong vertical (unstable) motion, not stable conditions.
- D. TCU are linked to showery, often heavy precipitation and turbulence, not light steady drizzle.
Clouds of Vertical Development
Cumulus and towering cumulus clouds form from strong convective updrafts and can develop into cumulonimbus thunderstorms.
- TCU is a transitional stage before cumulonimbus formation
- Indicates unstable air and strong vertical motion
- Associated hazards: turbulence, wind shear, lightning, hail
Memory trick: 'Low, Middle, High, and Towering' — remember clouds by their altitude family, plus the vertical growers.