Published: Sun, December 17, 2017
Worldwide | By Isabel Fisher

Low Humidity, Dry Conditions Trigger Red Flag Warning Across Bay Area

Low Humidity, Dry Conditions Trigger Red Flag Warning Across Bay Area

San Diego County will be under a red flag warning on Sunday beginning at 8 a.m., the National Weather Service said Friday. "Between low humidity and high winds that poses a danger, that's why we are on alert", said Santa Rosa battalion fire chief, Ken Sebastiani.

By late Saturday into Sunday, the pattern shifts to a Santa Ana (north easterly winds).

The National Weather Service's warning runs from 8 8 p.m. Sunday for gusty winds around 55 miles per hour - with isolated gusts up to 70 miles per hour - and low humidity. Relative humidity readings of 10 to 20 percent are forecast for Saturday afternoon, while humidity values of 10 to 30 percent are expected Saturday night.

Firefighting agencies urge residents to be ready to evacuate. Flames burned less than one acre before Cal Fire put it out.

Red-flag warnings are also in place for much of Southern California, the Sierra Nevada foothills and the northern two-thirds of the Central Valley.

Los Angeles County was under red flag warnings for 12 straight days until Friday, but the risk of wildfire is not yet over. The blaze has burned more than 250,000 acres, or almost 400 square miles, destroyed more than 900 structures and killed two people.

Winter fire weather warnings are unusual but not unprecedented in the Bay Area.

Fire conditions will improve Sunday and Monday as winds decrease and humidity slightly increases.

"High pressure over the Great Basin will bring a period of offshore flow", the weather service said.

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