While air quality in San Francisco on Friday remained good, that may be changing as the cloud of smoke from the Kincade Fire near Geyserville grows and shifts tonight into Saturday.

Officials at San Francisco International Airport said that air quality there was expected to change by evening and may begin having an impact on flights due to poor visibility. As the SF Business Times reports, the FAA will be making that determination come Friday evening.

The National Weather Service tweeted the GIF below on Friday morning of the expected movement of the smoke cloud, which shows it descending on San Francisco Bay by around 4 or 5 p.m. Friday, with air quality worsening as the night goes on.

A Smoke Health Advisory has already been issued in Sonoma County, where pregnant women and the elderly are being told to limit outdoor activity.

The Chronicle also has a real-time air-quality map, which still shows most of the Kincade Fire smoke blowing out to sea.

Due to the smoke, a Spare the Air Day has been called, but hopefully no one was planning on lighting any fires in fireplaces in this weather. Beach bonfires, though, area also out.

Related: Kincade Fire Reaches 5 Percent Containment, Burns 21,900 Acres