'Life-threatening' windstorm to hit US state as East braces for cold

Tens of millions of Americans have been put under weather warnings as deadly winds head for the West Coast and an Arctic blast freezes the East.

Officials have warned residents in Southern to brace for Santa Ana winds of up to 100mph that could increase the risk of wildfires and power .

, Orange, San Diego, Riverside, Ventura and San Bernardino counties can expect 50 to 70mph gusts, with wind gusts up to 100mph possible.

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