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Weather Report: Flying with Parcel Acceleration and Vertical Wind Sheers

The National Transportation Safety Board archives reveal some serious considerations for general aviation pilots who venture out into ANY unfamiliar condition. Lets examine a couple of noteworthy accidents using some of the highest caliber weather products available to meteorologists. Using these tools, well try to figure out where things went wrong. Unfortunately, todays tools and the expertise behind them werent available to the pilots involved in the accidents. But we can use this knowledge to find lessons that can be learned for pilots who might someday find themselves immersed in similar predicaments.

Gemini Sparkle

Key Takeaways:

  • Datalink radar imagery has significant delays (10-15 minutes), making it unreliable for precise storm navigation and suitable only for broad weather avoidance, as storm cells can shift dramatically.
  • Pilots can easily underestimate weather hazards, as seen when a pilot flew into a deceptively "ordinary-looking" but deadly thunderstorm, and Steve Fossett encountered extreme, localized mountain turbulence amplified by terrain on a seemingly calm day.
  • Mountains can generate powerful, localized vertical air motions (gravity waves, funneling effects) due to terrain interaction with winds, often exceeding forecasts even on clear days, emphasizing the need for comprehensive weather assessment and extra caution with speed and altitude.
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Sifting through NTSB archives has long been one of my interests. This is partly from a career of aviation weather forecasting and partly from crossing paths with Macarthur Job’s legendary Air Disaster book series that went beyond sensationalism, into the engineering and cockpit management aspects of important accidents. (Sadly, Mr. Job recently passed away.)

In that spirit, let’s examine a couple of noteworthy accidents using some of the highest caliber weather products available to meteorologists. Using these tools, we’ll try to figure out where things went wrong. Unfortunately, today’s tools and the expertise behind them weren’t available to the pilots involved in the accidents. But we can use this knowledge to find lessons that can be learned for pilots who might someday find themselves immersed in similar predicaments.

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