Smoke from the Sites Fire in Colusa County has led Bay Area regulators to extend an air quality advisory through Thursday. The fire, which started on Monday and has burned nearly 16,000 acres with only 5 percent containment according to Cal Fire, is causing smoke to drift southward.

“Smoke primarily from the Sites Fire is anticipated to continue affecting portions of Sonoma, Napa, and Solano counties until tomorrow,” officials from the Bay Area Air Quality Management District stated in a Wednesday news release.

While individuals, particularly those with health concerns, young children, and seniors, are advised to minimize exposure to smoky air, conditions are not expected to exceed the national 24-hour health standard, so no regional Spare the Air Alert has been issued.

For local impacts, people can monitor the U.S. Environmental Protection Agency’s fire and smoke map at https://fire.airnow.gov/.

The smoky conditions will coincide with a warming trend that will raise temperatures into the 80s to low 100s in the region’s interior valley areas away from the coast, according to the National Weather Service.

Peak heat is anticipated on Saturday, and while other areas will experience temperatures above average, they are not expected to reach hazardous levels.

Coastal regions can expect temperatures ranging from the 60s to the 70s, whereas communities along the Bay, particularly in the East Bay, will experience temperatures reaching the 80s during that time.