Update 7:10 p.m. There was a flash flood warning in effect from the Wrightwood area, northeast to the Adelanto area in the high deserts, National Weather Service meteorologist Jimmy Taeger tells KPCC. Some thunderstorms in that area were likely producing flash flooding, Taeger said. The flash flood warning was set to remain in effect for that area until 8:45 p.m.
"Additionally we have an urban and small stream flood advisory out running from the high desert area of Victorville, all the way towards the San Bernardino County Mountains near Running Springs and Lake Arrowhead from additional previous thunderstorms," Taeger said.
The flash flood warning in that area was set to be in effect until 7:30 p.m. There were some minor flooding reports across the area, but the National Weather Service hasn't received any major flooding reports in the high desert, Taeger said.
— KPCC staff
5:59 p.m. A series of storms and high rain rates have San Bernardino County on alert for flash floods. A warning was issued for the area 1:30 p.m. Wednesday and will go into the evening. Later in the afternoon, a warning was also issued for the Antelope Valley.
Another flash flood warning was issued shortly before 6 p.m. through 7:30 p.m. near the Pines burn area in the San Gabriel Mountains.
National Weather Service meteorologist Brett Albright said residents should follow warnings sent by the NWS.
"You want to pay attention when we issue those warnings ... if you don't have to travel or go outside if there is one for your area, try to avoid that," said Albright.
A road closure for Highway 18 was in effect due to flooding, California Highway Patrol Officer Robert Grieve told KPCC.
"Highway 18 in the Lucerne Valley area is currently flooded with debris and rocks that have washed down from the mountains above," Grieve said.
He added that several CHP units and supervisors on the scene waiting for Caltrans to arrive to clear the debris.
"Several cars have been stopped because of the flood," Grieve said.
The time the road would reopen was up in the air.
The National Weather Service said that Thursday will see a slightly higher chance for flash flooding in San Bernardino County. Wednesday's events could be more of an isolated case.
"We do expect this kind of weather pattern to continue through at least the next 48 to 54 hours, so through the day on Friday," Albright said.
The Antelope Valley flash flood warning is in effect until 6:15 p.m. Wednesday.
This story has been updated.