FLYING Magazine News Pilot Proficiency Weather

How to Decipher Flight-Level Weather

Here are some tips for finding the smoothest air to fly in.

Friday, November 01, 2024 at 09:32 AM ET

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Most pilots have access to a ton of weather guidance, but if you are routinely flying in the flight levels, here’s one more product to add to your list—constant pressure charts. [iStock]

Key Takeaways:

Constant pressure charts provide critical upper-air weather insights for pilots in flight levels, complementing surface charts by revealing overall system intensity, evolution, and optimal flight paths to minimize headwinds and turbulence.
These charts depict surfaces of constant pressure where varying geopotential heights identify upper-level lows (troughs, associated with cold air and adverse weather like turbulence) and upper-level highs (ridges, linked to warm air and fair weather).
The 500 mb chart is a crucial diagnostic tool for understanding atmospheric behavior and extended forecasts, helping pilots anticipate severe clear air turbulence by recognizing specific patterns like split-flow or sharp V-shaped meridional flow.

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Understanding the big weather picture is key to making good operational decisions. Most pilots have access to a ton of weather guidance, but if you are routinely flying in the flight levels, here’s one more product to add to your list—constant pressure charts.

Constant pressure charts not only help you with the quantitative aspects of your flight, such as finding the best altitude to minimize your headwind component, but they also help you with a few qualitative aspects, such as minimizing your exposure to uncomfortable clear air turbulence if you know what to look for.

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.