Frontal systems
Ask FLYINGHow Should I Use the Location of Troughs Information in Flight Planning?
An aviation meteorologist explains why troughs are important enough to depict on prog charts.
Scott Dennstaedt![](https://www.flyingmag.com/uploads/2022/08/Prog-Chart.png?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
![](https://www.flyingmag.com/uploads/2022/09/Pilot-and-copilot_adobe-stock-rs.jpg?auto=webp&auto=webp&optimize=high&quality=70&width=1440)
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