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 generated by thunderstorm downdrafts, posing risks like severe turbulence and low-level wind shear, particularly when moving in advance of the storm.
These are low-level events, typically below 6,500 feet AGL, detectable by NEXRAD radar (showing low reflectivity from density changes or debris, not necessarily precipitation), visible satellite imagery (if moisture is present), and surface observations (METARs for strong, gusty winds).
Pilots should be aware that datalink weather broadcasts often filter out gust fronts due to their low reflectivity, making alternative detection methods crucial for safely recognizing and avoiding them.

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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.