Autumn Transitions

By the time September arrives, most pilots in the northern hemisphere are tired of picking their way past cumulus clouds, dodging thunderstorms and dealing with diminished performance from high density altitudes. But with the arrival of autumn, things are about to change. Its not just a season where things get colder and we have to review icing. There is a lot in the details that can help your flight planning. …

Key Takeaways:

• Autumn weather in the Northern Hemisphere is characterized by stronger upper-level winds and intensified weather systems due to increased temperature contrasts, alongside a significant lowering of freezing levels which heightens icing risks.
• Regional impacts include the Gulf Coast facing tropical cyclone remnants, low-level jets, and surprise stratus/fog, while the West Coast experiences a transition from clear skies to potential Santa Anas and persistent valley fog.
• The Great Lakes region sees enhanced "lake effect" precipitation and deep low-pressure systems, and the Appalachians are prone to foehn winds following strong cold fronts, with an overall increased likelihood of widespread fog after rain.

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