UPDATE: More than 2 Inches of Rain Near Yucaipa Ridge, Burn Areas a Concern

Update 1:55 p.m. Snow falling in the San Bernardino Mountains made for slippery roads Thursday, a San Bernardino County Fire spokeswoman tweeted.

"Carry snow chains, blankets & water in car," Tracey Martinez advised.

Update 7:45 p.m. For flooding Thursday south of Redlands and west of Beaumont see

UPDATE: Flooding at San Timoteo and Live Oak, Firefighters Rescue Trapped Motorist

Update 7:11 p.m. More than 2 inches of rain fell on mountains north of the San Gorgonio Pass by 6 p.m. Thursday Nov. 21, and more rain Friday could be a concern for anyone who lives below burn areas in the San Jacinto Mountains, according to the National Weather Service.

Rainfall estimates Thursday evening included 2.67 inches at Rimforest, 2.55 inches at Lake Arrowhead, 2.24 inches at Crestline Ridge, 2 inches near Cabazon, and 1.93 inches at Crafton Reservoir east of Redlands.

A flash flood watch for Friday afternoon through Saturday afternoon stated:

A low pressure system moving over southwest California will create light to heavy showers over the desert mountain slopes Friday afternoon through Saturday afternoon. These showers will create the possibility of flash flooding along the desert mountain slopes into the lower deserts and Coachella Valley.

Areas that will be more prone to flash flooding are the recent burn scars on the desert mountain slopes. Showers will decrease in coverage by Saturday evening.

For more info visit www.southerncaliforniaweatherauthority.com.

Posted 2:35 p.m. More than one inch of rain had fallen near Yucaipa Ridge as of 1 p.m. Thursday and snow levels in the mountains on both sides of the San Gorgonio Pass were expected to drop to 5,000 feet by Friday, according to the National Weather Service.

The slow-moving storm system was bringing rain and snow to the mountains of San Bernardino and Riverside counties, including the towns of Angelus Oaks, Forest Falls, Pine Cove and Idyllwild.

As of 2 p.m. the precipitation in Forest Falls was coming down as rain and Valley of the Falls Drive was open, Bristyl Lindquist at Elkhorn General Store told Patch in a phone interview.

A winter storm warning was in effect for elevations above 5,000 feet until 10 p.m. Saturday, according to the Weather Service. Snow accumulations could reach 6 to 10 inches in some locations.

Southwest winds on of 10 miles per hour to 15 mph on Thursday were expected to become northeasterly and increase to 15 mph to 20 mph with gusts to 35 mph Friday morning through Saturday morning.

Visibility in the mountains could be reduced to one mile or less due to snow, blowing snow and fog.

"This weather could be deadly for unprepared campers and hikers," the Weather Service advised Thursday afternoon.

For more info visit www.southerncaliforniaweatherauthority.com.