Yet another storm system dumped rain across the Southland Thursday, making for a wet afternoon in most areas while prompting evacuation orders in some Orange County canyons due to fears of debris flows in the recent Bond Fire burn zone.

A voluntary evacuation warning took effect at 8 a.m. in the Silverado, Williams and Modjeska canyons in Orange County’s Bond Fire burn area, but by mid-afternoon it was upgraded to a mandatory evacuation order taking effect at 8 p.m.

“Canyon residents are strongly encouraged to evacuate prior to 8 p.m.,” according to a statement from the county. “Hard road closures will be in effect at 8 p.m. and access in and out of the canyon will be restricted to public safety and public works vehicles.”

People with disabilities or who need assistance evacuating were asked to contact the sheriff’s department at 714-647-7000.

The county activated its Emergency Operations Center Thursday morning to help expedite the response to any flooding or debris flows.

“We’re expecting at least a half-inch of rain,” Orange County CEO Frank Kim said, adding that with the ground already saturated from an earlier storm, officials are concerned.

“Even a quarter-inch on saturated ground can lead to a mudslide,” Kim said.

The National Weather Service issued a flood watch that will be in effect from Thursday night until Friday morning for coastal and inland Orange County. Forecasters said some mountain areas could receive 3 to 6 inches of rain from the “atmospheric river,” with the heaviest downpours expected after midnight through Friday morning.

The rain will persist intermittently — perhaps heavy at times — through the holiday weekend, according to the National Weather Service.

“Unsettled weather will prevail across the area with periods of rain through Sunday morning, heaviest Thursday into early Friday,” according to the weather service.

“Snow levels will remain quite high (Thursday) but will drop significantly Friday night into Saturday. Temperatures will be significantly below normal across the region.”

Snow levels will initially be around 9,000 feet, but will fall below 8,000 by Friday afternoon, bringing some light snow to about 5,000 feet by Friday night into Saturday morning.

The forecast came with the usual cautions for travelers.

“Moderate rain could create slick roads and travel delays along with high mountain snow accumulations and gusty winds,” forecasters said. “Additional rain and lowering snow levels could impact travel this holiday weekend.”

A wind advisory will be in effect until 9 a.m. in the Los Angeles County mountains, excluding the Santa Monica range, with gusts of up to 50 mph possible.

“Gusty winds will blow around unsecured objects and make driving difficult, especially for high-profile vehicles,” according to the NWS. “Tree limbs could be blown down and a few power outages may result.”

Daytime temperatures should be in the upper 50s to mid-60s Thursday, the mid-50s to lower 60s Friday and the mid-50s to around 60 on Christmas Day.

The Angeles National Forest tweeted Wednesday that due to the rain and low snow levels, the following roads have been closed:

— 3N17 from BD to Mill Creek;

— 4N33 Moody;

— 4N37 Indian Canyon passable in 4×4 only;

— 4N24 Bear Trap;

— 7N23 Sawmill/Liebre area – 4×4 only;

— 7N08 Maxwell truck trail;

— 7N22 Knapp ranch large wash out.

Forest officials also urged people to pick another day for hiking.

“With snowy conditions in high elevations and rain in lower elevations, we are suggesting that today is not the day to go into the forest,” according to the ANF. “Driving and hiking conditions will be extremely dangerous for even expert hikers. We suggest going after the storm has passed.”

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