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SAN DIEGO — Heavy fog was affecting some flights at San Diego’s Lindbergh Field Monday night.

Fog began rolling into the area around 8 p.m., an airport operations spokesman said.

By 10:30 p.m. visibility was at a quarter-mile, with a 100-foot ceiling, the spokesman said.

The airport’s website showed four departing flights delayed.

The spokesman said a Southwest Airlines flight had arrived at 10:09 p.m., but other arriving flights had been diverted. The spokesman did not know where those flights had been diverted to.

The ground stop was lifted as fog had cleared up by Tuesday morning.