Explosive cyclogenesis leads to atmospheric river in British Columbia

Cyclone brings heavy rain, snow to much of British Columbia

Environment and Climate Change Canada has issued a rainfall warning for Metro Vancouver, Fraser Valley and Howe Sound, with up to 100 millimeters of rain expected by Saturday morning, Dec. 3

An atmospheric river has hit British Columbia, bringing heavy rain and snow to the province. Environment and Climate Change Canada has issued a rainfall warning for Metro Vancouver, Fraser Valley and Howe Sound, with up to 100 millimeters of rain expected by Saturday morning.

The atmospheric river is being caused by a powerful low-pressure system, or cyclone, that is moving up the coast of British Columbia. The cyclone is expected to bring strong winds and heavy precipitation to the province, with the heaviest precipitation expected over the mountains.

The rainfall warning is in effect for Metro Vancouver, including the cities of Vancouver, Burnaby, Richmond and Coquitlam. The Fraser Valley, including the cities of Abbotsford, Chilliwack and Langley, is also under a rainfall warning. Howe Sound, including the communities of Squamish and Lions Bay, is also under a rainfall warning.

Environment and Climate Change Canada is urging people in the affected areas to be prepared for flooding and other hazardous conditions. The agency is also advising people to avoid driving in flooded areas and to be aware of potential power outages.

The atmospheric river is expected to continue to affect British Columbia through the weekend. The heaviest precipitation is expected to occur on Friday and Saturday, with the precipitation gradually tapering off on Sunday.