
The Federal Aviation Administration issued a ground stop Wednesday at the San Diego International Airport as a gray haze of fog closed in on downtown San Diego and its surrounding areas .
The ground stop was issued at about 7:15 a.m. and lasted until 8:30 a.m. due to low ceilings at the airport, the FAA said.
The aviation agency estimated anywhere from 30-60 flights could be affected by the ground stop. According to the flight tracking website FlightAware, 32 flights were delayed as of 8:30 a.m. with no cancelations when the stop was lifted.
A dense fog advisory issued by the National Weather Service was set through 9 a.m. Low visibility was possible up and down the San Diego County coastline with visibility in some areas less than a quarter-mile, the NWS said.
Get top local stories in San Diego delivered to you every morning. Sign up for NBC San Diego's News Headlines newsletter.
The same weather pattern was expected to continue through Friday.
This is a developing story. Details may change as information is released.