The threat of mud and debris flows prompted Riverside County public safety officials Thursday to issue a voluntary evacuation warning to neighborhoods in Lake Elsinore and the Temescal Valley.
The Emergency Management Department advised residents along Alberhill Ranch Road, Amorose Street, Glen Eden Road south of Corona, portions of the Glen Ivy Hot Springs and Horsethief Canyon communities and the area around McVicker Park to relocate until the runoff hazards abated.
Heavy downpours in the Cleveland National Forest triggered the warning, which could be followed by a mandatory evacuation order, officials said.
All of the locations abut the forest, where the 23,000-acre Holy Fire in August denuded hillsides, raising the potential for damaging flash floods, mud and debris flows.
The same areas were placed under a mandatory evacuation a week ago, when the region’s first major winter storm produced thunderstorms and intense rainfall that resulted in flooding and mud flows. Several homes were damaged, but no one was injured or trapped.
The National Weather Service issued a flood advisory that is in effect until 12:30 p.m. for western Riverside County.
“NWS radar indicated showers moving into Orange County and this activity will increase through noon. Showers will be heavy at times with rainfall rates of .15 to .25 per hour,” NWS forecasters said in a statement.
“Showers will also move into the western Inland Empire. The rainfall will cause urban flooding in low lying areas, poor drainages and swift water through channels,” forecasters said.
In a 24-hour period ending around 9 a.m., the metropolitan Riverside area received .20 of an inch of rainfall, the San Gorgonio Pass near Banning received .39 of an inch, Corona received .29 of an inch, .71 of an inch of rain fell near Silverado and Palm Springs received .19 of an inch, according to the NWS.
Meteorologists say the storm will drop up to a half-inch of rain in the Riverside metropolitan area Thursday, up to four-10ths of an inch in the San Gorgonio Pass near Banning and around a quarter-inch in the Coachella Valley.
Lake Elsinore could see up to three-quarters of an inch of rain, and the county mountains are expected to get up to an inch of rain, forecasters said.
Light snow could drop above 6,500 feet in the San Bernardino Mountains.
High temperatures Thursday are expected to reach 58 degrees in Riverside, 49 in the county mountains, 57 in the San Gorgonio Pass near Banning and 62 in the Coachella Valley.
Public safety officials told the Riverside County Board of Supervisors Tuesday that evacuations will be a reoccurring possibility for the duration of rainy season.
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