The third atmospheric river in the past 7 days is affecting British Columbia, Canada since early Tuesday morning (LT), November 30, 2021, bringing heavy rain and mountain snow.
Significant precipitation continues to overspread coastal and southern portions of British Columbia, as the last in a series of atmospheric rivers affects the region, The Weather Network (TWN) reports.1
A slew of rainfall warnings, snowfall warnings, and special weather statements are in effect as the moisture washes over the province.
The precipitation could lead to additional flooding, mudslides, and avalanches, potentially exacerbating an already precarious situation, TWN warns.
Widespread rainfall totals of 40 to 120 mm (1.6 to 4.7 inches) are expected by the end of the storm.
The highest totals are likely on western Vancouver Island and at higher elevations, where 100 – 200+ mm (3.9 – 7.9 inches) of rain is possible. Storm totals of 40 – 70 mm (1.6 – 2.7 inches) are possible around Metro Vancouver.
Image credit: NOAA/GOES-17, RAMMB/CIRA, TW. Acquired at 20:00 UTC on November 30, 2021
Environment Canada and Climate Change has issued special weather statements and rainfall warnings for the North, Central and South coasts, as well as the Lower Mainland.1
Snowfall warnings are in effect for Fort Nelson and the Yellowhead, while winter storm warnings are in effect for inland sections of the North Coast, including Stewart.
Runoff from snowmelt and a risk for avalanches will become a concern through Wednesday, December 1 as freezing levels quickly rise.
Continued snowmelt will further swell B.C.’s rivers, exacerbating the risk for flooding at lower elevations.
Evacuation orders remain in effect for properties near waterways in the Fraser Valley and in the Thompson-Nicola Regional District.2
The mayors of two Fraser Valley communities that have been hit hard by flooding this fall3, 4 say they are confident their residents can make it through these next two days of rain.
"I am pleased to share that at this point, we are holding our own," Mayor Henry Braun of Abbotsford said. "Unless we get a 200 mm [7.9 inches] dump Tuesday and Wednesday — that's a whole different ball game then," he said.
1 Heavy rain, high avalanche danger as atmospheric river washes over B.C. – The Weather Network
2 Storm brings another round of heavy rain to B.C.'s soaked southwest – CBC
3 Atmospheric river hits British Columbia, causing major floods and landslides, Canada – The Watchers
4 Agricultural disaster after record rains cause catastrophic floods in British Columbia, Canada – The Watchers
Featured image credit: NOAA/GOES-17, RAMMB/CIRA, TW. Acquired at 20:00 UTC on November 30, 2021
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