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The Severe Storm

Keri Decker captured the landing on video YouTube screen shot
Gemini Sparkle

Key Takeaways:

  • Thunderstorms are caused by atmospheric instability (warm, moist air rising into cold air), best quantified by CAPE, and their severity, especially for organized storms and tornadoes, is significantly enhanced by vertical wind shear and helicity.
  • Key storm features include powerful updrafts, downdrafts that can lead to dangerous microbursts (predictable with DCAPE), and outflow boundaries that can influence storm propagation or dissipation.
  • Pilots can visually assess storm strength by observing features like the rain-free base, cloud tops, and lightning activity (e.g., anvil crawlers), and should utilize resources like the Storm Prediction Center (SPC), satellite imagery, and radar for enhanced situational awareness.
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Strong thunderstorms are one of the places aviation and fear often intersect. And for good reason: severe storms have led to countless disasters, perhaps the most famous one being the Delta L-1011 crash at DFW Airport in 1985. That tragedy brought far-reaching consequences to flight training programs and ATC equipment, and led to advances in the field of meteorology.

You can read a lot about thunderstorms online and see all sorts of storm video and tornado footage on YouTube, but in this article I’ll draw on my experience as a flight forecaster, my radar and forecast training, and my decade-long foray into storm chasing, which gave me a look at things under the hood. I’ve distilled here some of the most useful fundamentals that are useful to pilots. Hopefully you’ll come away with a more detailed knowledge of what you’re up against when things are looking rough out there.

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