FLYING Magazine Pilot Proficiency Weather

Know Your Convective Outflow Boundaries

Pay particular attention to those strong, gusty winds before attempting a landing at an airport when storms are approaching.

Thursday, September 19, 2024 at 12:50 PM ET

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As a thunderstorm evolves, it will bring in warm, moist air to feed the intense updraft providing fuel for it to intensify. [iStock]

Key Takeaways:

Convective outflow boundaries, or gust fronts, are mesoscale cold fronts formed by air spreading from thunderstorms, capable of causing severe turbulence, dangerous low-level wind shear, and strong surface winds, especially when moving in advance of convection.
These low-level events are detectable on surface analysis charts, NEXRAD Doppler radar (as low-reflectivity lines), and sometimes visible satellite imagery, but radar can often overshoot them, making consistent detection challenging.
Pilots should be aware that common datalink weather broadcasts often filter out gust fronts; therefore, monitoring METARs, ground-based radar, and visible cues is crucial for identifying and avoiding these potentially hazardous phenomena.

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Surface analysis charts are issued every three hours by meteorologists at the Weather Prediction Center (WPC). On some you may have seen a tan dashed line with a label “OUTFLOW BNDRY” nearby. This is what meteorologists call a convective outflow boundary.

This Article First Appeared in FLYING Magazine

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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.