The first of two anticipated “pineapple express” storms has made its way into Southern California, following a powerful bout of rain that wreaked havoc across the San Francisco Bay Area. This storm system, characterized by warm, moist air originating from Hawaii, is expected to bring significant rainfall, though meteorologists predict it will be less intense than the recent deluge that set records in Northern California.
As the storm approached Southern California, it brought with it a series of challenges, particularly in areas already saturated from previous storms. In Sonoma County, a hillside gave way, causing a house to collapse into the Russian River, prompting evacuations in low-lying regions downstream, including towns like Guerneville. Flooding was reported across various roadways, including U.S. 101 and Interstate 5, leading to hazardous travel conditions.
Power outages affected approximately 15,000 customers early Wednesday as the storm intensified. While the storm is expected to ease up in Southern California by late Wednesday morning, it has raised concerns about potential flooding and rockslides, particularly in the mountainous regions where rainfall could trigger landslides.
Meteorologists noted that while the storm could lead to localized flooding, it is also viewed as beneficial, particularly for Los Angeles and Ventura counties, as it may help mitigate the risk of wildfires in the wake of a dry winter. The National Weather Service has indicated a 5% to 10% chance of significant debris flow in areas recently affected by wildfires, including the burn areas from the 2024 Lake fire.
Wind gusts in the region are expected to reach between 15 to 30 mph, with potential peaks of up to 50 mph in the high desert. These winds could lead to delays at Los Angeles International Airport and isolated power outages. Stronger gusts are likely in Santa Barbara and San Luis Obispo counties, raising concerns about falling trees and power lines.
In the wake of the first storm, a second, albeit weaker, storm is projected to arrive on Thursday, bringing additional rain and the possibility of further disruptions. The cumulative rainfall from both storms is expected to be modest, with downtown Los Angeles forecasted to receive less than 1.5 inches combined from both systems. This amount falls short of the 2 to 4 inches typically needed to significantly alleviate fire season risks.
Officials are preparing for potential landslides and mudflows, particularly in areas that have recently experienced wildfires. Roads, including a stretch of Pacific Coast Highway, have already been closed as a precaution against debris flows. The situation remains fluid, with forecasts indicating a mix of rain and dry conditions in the days to come.
As the storms unfold, residents are urged to remain vigilant and prepared for rapidly changing conditions, especially in areas prone to flooding and debris flows. The weather service continues to monitor the situation closely, providing updates as necessary.