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 cold, dense air spreading out from thunderstorms, and are identifiable on surface analysis charts.
These low-level events pose significant hazards to aviation, including severe turbulence, dangerous low-level convective wind shear, and strong surface winds, particularly when moving in advance of active convection.
Pilots should use METARs, ground-based radar (being mindful of potential overshooting), and visible satellite imagery for detection, as datalink weather systems often filter out gust fronts due to their low reflectivity.

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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.