The West Coast is in for a turbulent week as back-to-back storms bring heavy rainfall, mountain snow, and an increasing risk of flooding and landslides. After a relatively dry January, the sudden shift in weather patterns is expected to drench the region with significant precipitation, particularly in California and Oregon.
The first system, driven by an atmospheric river known as the Pineapple Express, has already begun delivering heavy rain to southern Oregon and Northern California. This moisture-laden system, which pulls tropical moisture from the Pacific, has dumped widespread rainfall of 2-4 inches in mountainous areas, with some locations approaching a foot of rain.
The intense rainfall has already caused water buildup on roads, minor flooding along streams, and travel delays. Meteorologists warn that continued downpours could lead to more significant flooding, landslides, and hazardous travel conditions. Cities such as Redding and Santa Rosa are expected to receive between 4-8 inches of rain more than a typical February’s worth of precipitation. In the northern Sierra Nevada, localized areas could see as much as 24 inches of rain by the time the storm subsides.
After a brief break in precipitation midweek, a second storm system is forecast to arrive late Wednesday into early Friday. Unlike the first storm, which primarily delivered rain to lower elevations, this next system will bring colder air, allowing snow to fall at lower elevations.
In northern California, snow levels will initially remain above 4,000 feet but are expected to drop to 1,000 feet over the Siskiyou Mountains by Thursday night. The Sierra Nevada will see heavy snowfall accumulation, with some locations receiving 1-2 feet of fresh snow. This will impact travel through the mountain passes, making conditions treacherous for motorists.
Southern California is not escaping the stormy weather, though rainfall amounts will be lower than in the northern part of the state. Los Angeles is expected to receive 0.25-0.50 inches of rain, while Santa Barbara could see up to an inch. While the rain will provide much-needed moisture to help reduce wildfire risks, it could also trigger mudslides in burn scar areas from recent wildfires.
Another round of lighter rain and drizzle is expected in Southern California late Thursday into Friday as the second system moves through.
With both storm systems hitting in quick succession, flood risks will continue to rise, particularly in northern California’s foothills and valleys. Landslides and road closures may also become a concern as saturated soils struggle to absorb additional rainfall. Travelers and residents should stay alert for weather advisories and be prepared for rapidly changing conditions.
While this wet pattern brings some relief from the dry start to the year, the sheer volume of precipitation over a short period poses significant challenges. As the storms unfold, residents along the West Coast should take necessary precautions to stay safe and informed.
