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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 experiences significant delays, rendering it unsuitable for precise navigation through or between storm cells; it should be used for broad weather avoidance only.
  • Even "modest-looking" thunderstorms on radar can contain extreme turbulence, icing, and hail, posing a deadly threat to aircraft, particularly at mid-level altitudes.
  • Mountainous terrain can generate severe, localized turbulence and powerful vertical air currents (e.g., gravity waves) that are often unpredictable and can exceed forecasts, even on clear, calm conditions at lower altitudes.
  • These accidents highlight the critical importance of pilot judgment in assessing weather risks, understanding technology limitations, and not underestimating environmental hazards, especially when presented with conflicting or delayed information.
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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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