As of noon, no structures were threatened or had been damaged, and no injuries had been reported, according to Alameda County fire spokeswoman Aisha Knowles.
Knowles said the main problem firefighters face Saturday is a shift in wind direction.
"What that does is decrease relative humidity, which has the potential to drastically increase fire behavior," she said. "The change in wind direction is of concern for firefighters today."
The fire started Thursday afternoon at Corral Hollow east of Livermore and spread to the southeast overnight. No evacuation orders have been issued and the fire has largely consumed grass, brush and oak woodland.
- VIDEO: Livermore fire 11:00 a.m. Friday video
- VIDEO: Livermore fire 11:00 p.m. Thursday video
- VIDEO: Livermore fire 9:00 p.m. Thursday video
- RAW VIDEO: Livermore fire
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