Update Friday, 9 a.m.
Crews made significant progress on the Zenon Fire last night, pushing containment to 70 percent and keeping the blaze at 47 acres.
Update, 7:50 p.m.
Cal Fire reports that the Zenon Fire is no longer threatening homes on the Nipomo Mesa.
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Update, 7:20 p.m.
Crews continue to make gains on the Zenon Fire on the Nipomo Mesa. The fire is now at 47 acres and 40 percent contained.
Update, 4:30 p.m.
The Zenon Fire is now 25 percent contained, and GPS from the air shows the fire has grown to about 25 acres, according to Cal Fire.
Forward progress on the brush fire has slowed, according to Cal Fire spokesman Chris Elms.
Elms said 12 homes are still considered threatened near Calle Laguna in the Black Lake Ranch Estates. Evacuations orders have been lifted.
San Luis Obispo County Fire, Five Cities Fire, Santa Maria Fire, Santa Barbara County Fire and the U.S. Forest Service are on scene working with Cal Fire.
Elms said the blaze moved quickly because of steep terrain and heavy vegetation in the area. He expected that crews would stay on scene throughout the night.
The fire will be under investigation to determine the cause, Elms said.
Firefighters are battling a 7-acre brush fire that broke out around the 800 block of Zenon Way near Nipomo on Thursday afternoon.
The fire was reported about 2:15 p.m., according to the police scanner. By about 2:30 p.m., the fire was “high-intensity,” according to the scanner.
Cal Fire tweeted about 2:52 p.m. that structures are threatened.
“We’re really having a tough time with it right now,” Cal Fire Capt. David Kay said.
This story will be updated.