The wildfire has primarily moved east through sparsely populated territory last burned in 2020. No structures have been lost and containment stood at 7% late Friday.

A heat advisory for the area is in effect until 9 p.m. Saturday. Temperatures in Calistoga are expected to reach a low of around 59 degrees Friday night and a high of near 91 degrees on Saturday, with 5 to 7 mph winds. The chances of dry lightning are low but "not zero," the weather service said in its forecast discussion.