Southern California Braces for Rain, Snow, and Potential Flooding with New Atmospheric River
Despite the warm weekend temperatures, Southern Californians will need to prepare for rain, snow, and possible flooding this week as forecasters predict two cold storms, including a powerful atmospheric river, will impact the region.
The first storm is expected to arrive Monday evening, bringing a 70% chance of light showers on Tuesday, along with gusty winds in areas south of Point Conception, according to the National Weather Service. A more intense atmospheric river is forecast to hit early Wednesday, delivering heavy rain along the coast and impacting mountain regions as it moves eastward through the week.
Robbie Munroe, a meteorologist with the National Weather Service in Oxnard, noted that “no area will likely escape moderate to heavy rain,” with some areas potentially experiencing isolated heavy showers. Rainfall of 1 to 2 inches is expected in the valleys and 2 to 4 inches in higher elevations, with a flood watch in effect from 6 p.m. Wednesday to 6 p.m. Thursday.
The storm also poses a risk of heavier showers and thunderstorms in southwest-facing mountains and foothills, areas particularly vulnerable to such weather patterns. Munroe emphasized that “everyone will experience some part of this storm.”
In burn scar areas, there is an increased risk of flash flooding, debris flows, and mudslides. Local authorities have ramped up preparedness efforts.
“We are confident in our ability to manage debris flows and are working closely with the fire and sheriff’s departments to coordinate potential evacuations in areas that lack debris basins,” said Mark Pestrella, director of Los Angeles County Public Works.
Impact on Coastal, Valley, and Mountain Areas
Coastal and Valley Areas:
Rainfall in coastal and valley areas is expected to range from 1 to 2 inches between Wednesday and Thursday. A 10% to 20% chance of thunderstorms could lead to heavy downpours and significant flooding, especially in areas affected by recent wildfires. Wind gusts of 30 to 50 mph are also possible, which may cause downed tree branches and power outages.
If you experience a power outage:
– Stay indoors, as streetlights may be out, and flying debris can be dangerous.
– Avoid opening refrigerators or freezers as food can remain safe for up to four hours without power.
– Never use candles due to fire risks—use a battery-powered flashlight.
– Unplug electronics not connected to surge protectors.
– Conserve phone and laptop batteries for emergency use.
Mountain and Desert Areas:
In mountain regions, 2 to 4 inches of rain is forecast, while desert areas may receive about 1 inch of rain. Some mountain areas are also expected to receive heavy snow. The risk of flooding and debris flows is heightened in regions near recent burn scars, including areas affected by the Palisades, Hurst, Kenneth, Sunset, and Eaton fires.
The National Weather Service warns of hazardous travel conditions due to rain, snow, and gusty winds in these areas.
Snow Levels:
Snow is expected at elevations between 3,000 and 4,000 feet on Wednesday, potentially dropping as low as 2,500 feet by Thursday. The San Bernardino and Riverside County mountains could see snow at 6,000 feet, while snow may reach 6,500 feet in the San Diego County mountains.
Northern California and the Sierra Nevada will also experience heavy snow and strong winds, with gusts ranging from 40 to 60 mph.
Travel Warnings:
Several highways may be impacted by snow between Wednesday night and Thursday morning, including:
– The 5 Freeway near Tejon Pass
– Highway 14 through the Antelope Valley foothills near Acton
– Highway 33 north of Ojai
– Upper portions of Highway 154 in Santa Barbara County
If you need to travel in snow or rain, Caltrans advises:
– Check road conditions and chain control requirements before leaving.
– Ensure your vehicle has a full tank of gas in case of delays or route changes.
– Allow extra time for travel, as weather conditions may cause delays.
As the storms develop, authorities urge residents to stay updated and follow safety precautions to avoid potential hazards.