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Winter storms in California cause mudslides, with heavy snow forecast

An unusually cold and wet Californian winter has caused mudslides, damaged infrastructure – and topped up the state’s depleted reservoirs

By Carissa Wong

1 March 2023

Homes damaged by a mudslide in La Cañada, California, during a winter storm

A mudslide on 28 February that was triggered by a powerful storm passing through La Cañada, a city in the foothills of the Verdugo Mountains in Los Angeles

David McNew/Getty Images

Powerful storms have lashed California in recent days, causing mudslides that have damaged homes. Heavy snow, strong winds and rain since 24 February have toppled trees and power lines across the state, without electricity.

Blocked mountain roads mean people living in San Bernardino County, southern California, are stranded with dwindling food and fuel supplies, causing a local emergency to be declared. So far, no deaths or injuries due to the storm have been reported, although at least 22 people died in storms California experienced in January.

The storm is causing “extremely dangerous to impossible driving conditions” and “widespread road closures & infrastructure impacts”, .

It has also broken several records. The temperature in San Francisco dipped to 4°C (39°F) on 24 February, its lowest in 132 years. Meanwhile, Los Angeles International Airport saw a on 25 February. A blizzard warning was announced by the National Weather Service in San Diego, southern California, for the first time ever.

Over the next few days, heavy snow is forecast to fall in northern California, where the National Weather Service has predicted it to accumulate at 51 mm per hour amid wind gusts of up to .

Before this most recent storm, the state was already experiencing an unusually cold and rainy winter that has already caused flooding and mudslides.

One upside of the gloomy weather is that it may help ease the droughts that California experiences, at the National Weather Service . Reservoirs have been replenished – although groundwater supplies remain low.

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