Crews responded to the Hollister Ranch area, near Gaviota State Park in Santa Barbara County, just after 11:32 a.m. They included aircraft and firefighters with the Santa Barbara County Fire Department and the Vandenberg Fire Department.
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The Hollister Fire has already scorched at least 100 acres, but erratic winds mean there is the potential to grow to several hundred acres.
The fire is 40 percent contained as of Sunday evening.
No injuries have been reported. At least one structure is threatened as officials called for people to evacuate the area as a precaution.
An evacuation order was issued for the communities near the fire on Saturday, but that order has since turned into an evacuation warning.
The evacuation warning is expected to be lifted Monday at 8 a.m., according to Santa Barbara County Fire spokesman Daniel Bertucelli.
Officials say the fire is burning towards a drainage route. The California Highway Patrol closed Gaviota Beach Road from the 101 Freeway.
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No further details were immediately known.
The cause of the fire is under investigation.