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Beware of Young, Innocent-Looking Cumulus Clouds

Gemini Sparkle

Key Takeaways:

  • Veteran pilot Bob Buck's research from the 1940s highlighted that even "innocent-looking" cumulus clouds in their primary stage can be unexpectedly turbulent and dangerous.
  • Modern pilots should be aware that Nexrad radar data is delayed by 4-5 minutes, meaning a clear screen does not guarantee calm skies as storms can develop rapidly.
  • While radar is a valuable strategic tool for avoiding intense weather, its inherent delay means it should not be relied upon for real-time tactical decisions, especially when conditions favor rapid thunderstorm development.
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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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