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 created by cold, dense air spreading out from thunderstorm downdrafts, posing risks of severe turbulence, strong winds, and low-level wind shear, particularly when advancing ahead of the main convection.
These are low-level atmospheric events characterized by abrupt, jarring shifts in vertical air motion that can severely impact aircraft, even in the absence of precipitation, and are often dangerous as they move away from weakening thunderstorm cores.
Pilots can detect gust fronts using surface analysis charts, METARs, ground-based radar (though radar can overshoot distant fronts), and visible satellite imagery; however, datalink weather broadcasts often filter them out, requiring pilots to rely on other observations for 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.