San Francisco International Airport once again experienced flight delays Monday morning as thick fog and low clouds covered the Bay Area. The Federal Aviation Administration (FAA) issued a ground delay program to manage the reduced visibility, which slowed flights coming into SFO from across the U.S. and parts of Canada.
FAA officials began spacing out plane arrivals shortly after 8 a.m. due to “weather/low ceilings,” according to an advisory. The arrival rate at SFO was reduced to just 36 planes per hour.
Delays Stretch to Over an Hour
Because of the restricted landing rate, travelers faced delays averaging 36 minutes. Some passengers had to wait as long as 82 minutes before their flights were cleared to land.
Why Ground Delay Programs Are Used
Ground delay programs are commonly used during foggy or low-visibility conditions. Instead of sending planes into holding patterns above the Bay, air traffic controllers keep flights on the ground at their departure airports. This ensures aircraft only arrive in San Francisco when it is safe for them to land.
Foggy, Gloomy Weather Continues Across California
Monday’s delays came during a long stretch of gray, fog-heavy mornings across California. A dense fog advisory remained active for parts of the Central Valley and foothills, where visibility dropped to a quarter mile or less. Drivers were warned of hazardous conditions.
Meteorologists say a strong, persistent high-pressure ridge — often called the “ridiculously resilient ridge” — is blocking storm systems. As a result, tule fog and low marine clouds continue to develop overnight and linger into the morning.
When Will Conditions Improve?
The Bay Area forecast predicts more fog through the week. The next meaningful chance of rain isn’t expected until around December 15.
The National Weather Service said there was a slight chance of clearing Monday afternoon in the North Bay and East Bay, with better chances for clearing in San Francisco and the South Bay. However, low clouds are expected to return overnight and create more fog Tuesday morning.
Airlines Advise Travelers to Plan Ahead
Airlines urged passengers to check their flight status early and arrive at the airport with extra time in case delays continue.
Reporting assistance by Anthony Edwards.
Conclusion
Fog continues to disrupt flights at SFO as low clouds reduce visibility and force the FAA to manage arrivals more carefully. With more foggy mornings expected throughout the week, passengers flying through San Francisco should stay alert, check updates frequently, and prepare for possible delays.
