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Beware of Young, Innocent-Looking Cumulus Clouds

Gemini Sparkle

Key Takeaways:

  • Veteran pilot Bob Buck's 1940s research highlighted that even small, innocent-looking cumulus clouds in their early stages can contain very strong turbulence and static fields.
  • Modern pilots using Nexrad must remember that radar images are delayed by several minutes, meaning a clear screen doesn't guarantee calm skies, especially when conditions are prime for rapid thunderstorm development.
  • While radar is an invaluable strategic tool for avoiding intense weather and tracking movement, it should not be considered a real-time guarantee of calm conditions against rapidly forming storms.
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Some things never change, and the danger of flying into the wrong thunderstorm is one of those things. In Bob Buck’s superb 2002 memoir, North Star Over My Shoulder, the veteran pilot recalled flying a B-17 Flying Fortress all over the globe seeking out convective activity and performing research for the military on thunderstorms and static discharge within the atmosphere. An inspirational writer as well as a historically great pilot, Buck died last year in his 90s. His recollections from the 1940s are as vital to pilots today as they were to the wartime aviators for whom the research was intended. Starting with a quote from his wartime logbook, he then added parenthetical insight from subsequent years’ experience:

“Flew through a small shower near Mt. Pocono, Pennsylvania, top estimated at 15,000 feet-innocent looking, but very high [static] fields and very, very rough.” (This was probably a thunderstorm in the process of creation. This, we found, is the time the turbulence is often strongest, the primary stage of a thunderstorm. Lesson: don’t think a pretty, white cumulus cloud building is innocent; it may pack a very hard punch.)

Mark Phelps

Mark Phelps is a senior editor at AVweb. He is an instrument rated private pilot and former owner of a Grumman American AA1B and a V-tail Bonanza.

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