California is about to be hit by a powerful storm, according to the National Weather Service. The agency predicts that temperatures in some areas may drop by as much as 20 degrees Fahrenheit, with rain expected to start in Northern California on Wednesday night and expand southward into Southern California by Thursday morning. Due to the storm, the opening day of the Mammoth Mountain ski resort for this season will be delayed.
The weather in California this year has been characterized by extreme fluctuations, with temperatures soaring to as high as 90 degrees Fahrenheit (about 32 degrees Celsius) in some parts of Southern California in November. However, in the coming days, temperatures are expected to plummet suddenly.
This intense storm is forecasted to continue through the weekend, bringing not only lower temperatures but also widespread rain, strong winds, mountain snow, and high surf along the coast. Coastal and valley areas are expected to receive 1 to 2 inches (about 25 to 50 millimeters) of rain, while higher elevations and mountain slopes could see 2 to 5 inches (about 50 to 125 millimeters). Flood warnings may be issued in the event of heavy rainfall and thunderstorms.
Furthermore, areas in Santa Barbara County, Ventura County, and Los Angeles County that have been affected by wildfires may experience mudslides and debris flows. Rainfall rates of half an inch per hour are enough to pose a significant risk of mudslides.
Meteorologists from the National Weather Service say that with the arrival of this powerful storm, temperatures could drop by as much as 20 degrees Fahrenheit from Tuesday to Friday. Afternoon highs in inland and coastal communities will dip to around 60 degrees Fahrenheit (about 15.5 degrees Celsius), while mountain areas could see temperatures around 40 degrees Fahrenheit (about 4 degrees Celsius). Shallow marine layers and fog may develop along the coast and over the ocean.
According to the models from the National Weather Service, an atmospheric river will first hit Northern California before moving southward, spreading to Los Angeles, Riverside County, San Bernardino County, Orange County, and Ventura County by Thursday morning. Early Friday morning, Southern California is expected to experience heavy rainfall, impacting the morning commute. Rain and showers are expected to persist over the weekend.
The forecast indicates a 10% to 20% chance of thunderstorms, so residents in Southern California should prepare for brief periods of heavy rainfall, small hail, gusty winds, and lightning. Commuters should allow extra time and watch out for localized flooding on roads.
The National Weather Service specifically advises against driving on flooded roads during rainy days, as just a few inches of water can cause a vehicle to lose control and drift. If thunder is heard, seek shelter indoors immediately. Given the ongoing weather instability in the coming days, the meteorological agency will continue to monitor and provide updates.
The Mammoth Mountain ski resort has also postponed its opening day for the season due to the approaching storm.
In a statement, the resort said, “In order to make the most of the new snowfall, we have decided to postpone the official opening day until November 15th. This will allow Mother Nature and our operations team enough time to prepare the ski facilities and deliver an exciting first day on the slopes for everyone. We look forward to celebrating the start of the 2025-26 ski season with everyone this Saturday.”