Southern California is gearing up for a powerful atmospheric river storm that is anticipated to bring heavy rainfall, mountain snow, and strong winds. This weather event, described by the National Weather Service (NWS) as “the largest storm of the season,” poses potential risks of flooding and other life-threatening impacts.

Weather Forecast: What to Expect

The storm is set to hit Southern California, with rain expected as early as Saturday evening and lasting through Tuesday and Wednesday. The NWS warns of the possibility of 48 hours of continuous rain. The forecast highlights key timings:

• Saturday 7 p.m.: Showers in Ventura County, potential snow in mountain areas.
• Sunday 5 a.m.: Light to moderate showers in Los Angeles and Orange counties.
• Sunday 12 p.m.: Heavier rain and possible lightning across Los Angeles and Orange counties, reaching San Bernardino County.
• Sunday 11 p.m.: Continuation of heavy rain in Southern California.
• Monday to Tuesday: Persistent storm, raising concerns of flooding.

Snowfall in Southern California Mountains

Mountain areas are expected to experience snow starting Sunday night, with heavy snowfall anticipated on Monday and Tuesday. The combination of heavy rain and snow raises the risk of flooding in mountain communities.

Understanding Atmospheric Rivers

The storm is a result of a cold front from Alaska colliding with an atmospheric river moving across the Pacific. Atmospheric rivers are common ahead of cold fronts, causing heavy rain along coastal and inland regions. According to National Weather Service forecaster Bob Oravec, the storm may intensify due to a process known as bombogenesis, resulting in a bomb cyclone.

Rainfall Projections

The NWS forecasts 24 to 36 hours of continuous rain, with Los Angeles and Orange counties expecting up to 5 inches. Valleys and the Inland Empire could see 3 to 7 inches, while mountain communities may experience 6 to 12 inches, possibly 15 inches. The high desert could see 2 to 3 inches of rain.

Snow Accumulation in Mountains

Mountain communities at 6,000 feet elevation might see 2 to 4 feet of snow, adding to the challenges posed by the storm.

Impending Danger: Why the Storm Is Considered Risky

The intensity of the storm raises concerns about mudslides and dangerous flooding in Southern California. The highest threat is anticipated on Sunday and Monday, particularly for Ventura and Santa Barbara counties. Strong winds, a high surf advisory, and potential power outages further contribute to the storm’s dangerous nature.

California’s Preparations

In response to the impending storm, the California Governor’s Office of Emergency Services has activated its operations center, deploying personnel and equipment to areas at highest risk. Brian Ferguson, the office’s deputy director of crisis communications, emphasizes the broad sweep of threats across California over the next 10 to 14 days.

Storm Preparedness Tips

As the storm approaches, the NWS advises residents to charge batteries and phones, secure outdoor objects, and exercise caution near the open ocean.

Conclusion

With Southern California on high alert, preparations are underway to mitigate the significant threats posed by this powerful storm. Residents are urged to stay informed, take necessary precautions, and be ready for an extended period of adverse weather conditions. The potential for life-threatening impacts necessitates a collective effort in ensuring the safety of Californians across the affected regions. Stay tuned for the latest updates as the storm unfolds.