California is expected to receive more rainfall by Friday from an atmospheric river storm than what Lake Mead in Nevada—the largest reservoir in the U.S.—can hold, meteorologists have said, as the state continues to face the threat of flooding.
The parade of atmospheric rivers that pounded California for three weeks finally faded on Monday, enabling the state to begin lengthy repairs to roads and levees as the White House announced President Biden planned to survey the damage.
California saw no relief from drenching rains early Tuesday as the latest in a relentless string of storms continued to swamp roads and batter coastlines with high surf, turning rivers into gushing flood zones and forcing the evacuation of thousands in towns with histories of deadly mudslides. At least 14 people have died since the storms began last week.
Thousands of residents were under evacuation and shelter-in-place orders early Tuesday after heavy rains unleashed mudslides in a mountain area east of Los Angeles that burned two years ago, sending boulders and other debris across roads.
Firefighters went street by street in the community of Forest Falls Monday night to make sure no residents were trapped. Eric Sherwin, spokesperson for the San Bernardino County Fire Department, said crews hadn’t found anyone who needed to be rescued and no one was reported missing. Crews would canvas the neighborhoods again and begin cleanup efforts after sunrise, he said.
A robust atmospheric river storm started to taper off Tuesday morning in the Bay Area after shuttering highways due to flooding and prompting evacuation warnings in areas left scarred by wildfires and susceptible to mudslides and debris flows.
A massive storm barreled toward Southern California on Monday after flooding highways, toppling trees, cutting power and causing rock slides and mud flows in areas burned bare by wildfires across the northern half of the state.
Drenching rains and strong winds accompanied the weekend arrival of an atmospheric river — a long plume of Pacific moisture — into the drought-stricken state.
Rainfall records were shattered and heavy snow pounded high elevations of the Sierra Nevada. The National Weather Service issued numerous flash flood warnings.
The fire that rampaged through the San Lorenzo Valley in August and September burned hotter and destroyed more acreage than anyone in these rugged, rural and breathtaking mountains can remember.
The mudslides that follow wildfires in Southern California can be deadly and difficult to predict. New research can help officials identify areas prone to these mudslides and respond before disaster occurs, according to scientists.
Mudslides, or debris flows, can occur when rainfall washes away the buildup of sediment in mountain channels. Roughly equal parts water and sediment, debris flows are strong enough to carry large boulders downhill and threaten communities on or near the mountains.
With parts of California yet again burned by severe fires, the state is facing a new winter of mudslides.
Why do mudslides happen so often in California?
Mudslides have always been at the heart of the peril of living close to the mountains in California. All it can take is an intense amount of rain in a short amount of time to create damaging flows of mud and debris that can kill people and destroy buildings.
In Mendocino County, emergency staffers waited for a supervisor to show up before they warned residents of a growing fire siege in 2017. In Santa Barbara County, officials hesitated to issue blanket evacuation orders before mudslides ripped through Montecito in 2018 because they worried they might trigger a panic. And in Butte County in November, whole neighborhoods in Paradise were never told to evacuate as the Camp fire swept toward town. In each case, local emergency preparedness agencies failed to adequately warn communities that death was approaching. Experts say the failures point to an approach to emergency management — administered by individual counties — that has proved outdated in an era of massive, fast-moving wildfires and other extreme weather events.
The Water News Network is San Diego County’s source for water news and information.
