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An atmospheric river is exactly what it sounds like – it’s a long, narrow river of water vapour in the lower atmosphere.
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These rivers in the sky transport moisture from the subtropics to the mid-latitudes.
Rainfall intensity will vary across regions, with central B.C.’s coastline east of Haida Gwaii expected to experience an AR3 event, while southern Vancouver Island will see AR1 to AR2 conditions.
This rainfall will provide much-needed relief for ongoing wildfires and dry conditions in parts of the B.C. coastline, ranging from moderate drought to abnormally dry.
A month’s worth of rain: Accumulations could be significant
Rainfall accumulations could be significant, with Vancouver Island’s western regions and the central coastline forecast to receive over 100 mm.
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The North Shore and Lower Mainland are expected to total 30-60+ mm. Many areas could see a month’s worth of rain in just two to three days.