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Dangerous Radar Data

This is the NEXRAD image from the exact time of the crash.
Gemini Sparkle

Key Takeaways:

  • In-cockpit weather displays (like XM Weather/NEXRAD) have significant latency, showing where weather *was* rather than current conditions, leading to potentially dangerous misjudgments of fast-moving or rapidly developing storms.
  • Pilots must obtain complete weather briefings before takeoff and use in-cockpit weather to *avoid* thunderstorm areas entirely, as all thunderstorms present serious aviation hazards that cannot be reliably assessed visually or navigated through.
  • Clear indicators of danger, such as rapid storm forward motion, intense reflectivity, or specific storm shapes, should prompt pilots to delay flights, even if official severe weather warnings have not been issued.
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Another season of turbulent spring weather is just ahead, so it’s a good time to go over storm safety. We’ll do that once again by discussing a pertinent weather-related accident. Although at first glance the lessons might seem obvious, we’ll use this fateful ride-along to discuss some key concepts I’ve observed as a meteorologist, and point out some techniques that you might find useful someday during a rough ride.

Not the Best Day

Our case study takes us to the pre-dawn hours of a stormy March morning in western Tennessee. The accident aircraft was a Eurocopter AS350, registered to a regional hospital network. The helicopter was state of the art, equipped with MFDs, EGPWS, and night vision equipment. During this unsettled night, it arrived at Jackson-Madison County General Hospital with a patient airlifted from a nearby town. After dropping the patient off, the pilot prepared for the westward return flight to its home base in Brownsville, Tennessee, 23 miles away. The time was 0540L (0540 local).

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