An atmospheric river headed toward the B.C.'s South Coast will bring significant rainfall to parts of the Lower Mainland. The storm has prompted Environment and Climate Change Canada to issue an orange warning, under its new colour-coded warning system , for parts of the Fraser Valley.

People living in the central and eastern Fraser Valley — including Chilliwack, Hope, and western sections of Highway 3 from Hope to Princeton — can expect rainfall amounts between 70 to 100 millimetres between Tuesday night and Wednesday evening.

"Warm air with the system will cause freezing levels to rise and snowmelt combined with the already saturated ground and heavy rain, will likely result in high streamflows and localized flooding," the warning reads.

Metro Vancouver and the western portion of th

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