When operating near large bodies of water, especially on the west coast of the United States, you might encounter the “Fog Monster” from the excellent article by Tim Vasquez in the May, 2013 IFR. Since I’ve spent over 20 years under the spell of this weather pattern, I’ve learned that fog is only a symptom of the marine layer that spawns it. So, the monster could be actual fog or low, dense clouds.
Tame the Fog Monster
Key Takeaways:
- The "Fog Monster" refers to the West Coast marine layer, an unpredictable and rapidly changing phenomenon of low clouds or fog that can quickly reduce visibility from VMC to IMC.
- Anticipating marine layer activity requires observing multi-day weather patterns, monitoring temperature/dew point spread, onshore breezes, and satellite imagery due to its swift and localized changes.
- Coastal flight operations demand careful planning; for arrivals, pilots should thoroughly review IAPs and secure alternate airports, while departures generally recommend an IFR clearance over VFR options.
- VFR legality in controlled airspace relies on official surface visibility reports, which can be deceptive as the marine layer often creates significant localized visibility differences across an airport.
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