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 air spreading out from thunderstorms, posing risks of severe turbulence, strong winds, and low-level wind shear, particularly when moving ahead of convection.
These boundaries can be identified on surface analysis charts, ground-based NEXRAD radar (which detects density changes and debris rather than precipitation), visible satellite imagery (if moisture is present), and by observing strong wind gusts in METARs.
Datalink weather broadcasts often filter out gust fronts as they typically don't produce significant precipitation reflectivity; therefore, pilots must actively use multiple sources like METARs, full radar mosaics, and visible satellite imagery for detection and avoidance.

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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.