Weather alerts are in effect across the Pacific north-west this week as a series of atmospheric rivers are forecast to deliver multiple rainfall events and heavy mountain snow from western British Columbia in Canada , to Washington and Oregon in the US.

More than 200mm (8ins) of rainfall is expected across the western half of Washington state and north-west Oregon by Friday, with between 100-150mm expected in cities such as Seattle and Portland. About 400mm are possible on the western side of the Cascades, while more than a foot of snow is expected above 1,800-2,100 metres.

The National Weather Service has issued a flood watch for north-west and central Washington state where urban and river flooding is likely. Sharp rises to river levels are possible on rivers that flow off the Casc

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