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And the Thunder Rolls: Convective Weather Season Is Upon Us

Flying high gives pilots the best opportunity for unlimited visibility and safe conditions.

Pulse-type convection can develop quickly during the afternoon hours and be very scattered or isolated. It is usually easy to see and avoid. [Courtesy: Scott Dennstaedt]
Gemini Sparkle

Key Takeaways:

  • Pilots need to move beyond basic thunderstorm knowledge, understanding that "deep, moist convection" is driven by three key ingredients: instability, moisture, and a lifting source, with an emphasis on difficult-to-measure vertical atmospheric motion.
  • Thunderstorms manifest in various organizational forms, including linear squall lines, large nocturnal mesoscale convective systems (MCSs), banding around tropical systems, and "pulse-type" convection, each with distinct characteristics and hazards.
  • Effective in-flight thunderstorm avoidance relies on advanced weather equipment (onboard radar, datalink), flying high to maintain visual separation above haze, and understanding that while convective activity peaks in the afternoon/evening, strong systems can occur outside this window.
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Most people like to swallow the bad news first and then wash it down with the good news. The bad news is that most of what you might have learned about thunderstorms is probably worthless—not to mention all the useless banter you hear from your local TV weather personality or read on internet aviation forums. So, in my best British accent, it is often littered with bloody misconceptions, and in some cases, outright poppycock.

The good news is that I got your attention. It is very obvious that the FAA requires a pilot to have a rudimentary knowledge when thunderstorms are a flight risk. However, being able to regurgitate the three stages of the thunderstorm lifecycle, for example, is as useful as the Washington, D.C., Air Defense Identification Zone (ADIZ) is to a general aviation pilot. 

Scott Dennstaedt, Ph.D

Scott resides in Charlotte, North Carolina, and flies regularly throughout the Mid-Atlantic and Southeast U.S. He is a CFI and former NWS meteorologist. Scott is the author of "The Skew-T log (p) and Me: A Primer for Pilots" and the founder of EZWxBrief.

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