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First atmospheric river of fall deluges parts of B.C. south coast, southern Interior

Darpan News Desk The Canadian Press, 18 Oct, 2023 01:21 PM
  • First atmospheric river of fall deluges parts of B.C. south coast, southern Interior

British Columbia's south coast is weathering its first atmospheric river of the fall and the province's Ministry of Emergency Management and Climate Readiness, Bowinn Ma, says residents should prepare for increased rainfall and the chance of flooding.

Rainfall warnings cover most of Vancouver Island, as well as the Sunshine Coast, Howe Sound, Whistler and Metro Vancouver as Environment Canada pinpoints a firehose-like band pumping moisture from the subtropics directly at the B.C. coast.

More than 200 millimetres of rain could fall along sections of western Vancouver Island, while 80 to 110 millimetres are forecast across the Howe Sound, Whistler and Sea-to-Sky regions before the storm is expected to ease late in the day.

Up to 80 millimetres could drench Metro Vancouver, and the weather office says localized flooding in low-lying areas is possible everywhere the warnings are posted.

The rain-shadow effect will protect much of the Interior from heavy downpours, but a special weather statement covers the West Columbia region of southeast B.C., which could see as much as 50 millimetres of rain by early Thursday.

High streamflow advisories are in effect for Vancouver Island and the inner south coast, as well as the North and South Thompson and Upper Columbia regions of the Interior, while both the emergency management and forests ministries warn the rain could complicate wildfire recovery in regions such as the Shuswap.

"Following a season of severe drought and wildfire, rainfall on impacted areas can generate high surface water run-off and erosion due to a lack of vegetation, leading to a possibility of localized flooding and landslides," the province's statement says.

It also says widespread or severe impacts are not expected as part of the latest atmospheric river system, but officials are urging all residents, no matter where they live, to take steps to prepare for seasonal storms.

B.C.'s worst atmospheric river hit the south coast and southern Interior on Nov. 14, 2021, bringing two days of intense precipitation that killed five people, cut all road and rail links with the rest of the province and Canada, and caused devastating landslides and floods in communities including Merritt, Princeton and Abbotsford.

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