Canada: Severe weather forecast across southwestern British Columbia through at least early Nov. 5

Severe weather is forecast over southwestern parts of British Columbia through at least early Nov. 5. A weather system moving in from the Pacific Ocean is forecast to bring rainfall, strong winds, and snow over higher elevations to parts of the region. Flooding is possible in areas where heavy rainfall occurs. Hazardous travel conditions are likely in areas where more wintry precipitation falls due to slippery roads and reduced visibility caused by blowing snow. Strong winds may cause property damage and power outages in parts of the affected area.

As of early Nov. 5, Environment Canada has issued red strong wind warnings (the highest level on a three-tier scale) across Haida Gwaii Island, much of Vancouver Island, and parts of the western mainland coast; winds gusting up to 110 kph (68 mph) are possible in these areas. Grey special weather statements for strong winds and heavy rainfall have been issued across parts of Vancouver Island and far southwestern parts of the province, including Metro Vancouver. Red winter storm warnings and grey special weather statements are in effect for sections of Highway 3 due to hazardous travel conditions caused by strong winds and reduced visibility due to blowing snow. Officials could update and extend the coverage of weather alerts over the coming hours.

The storm system could produce rounds of heavy precipitation, including rain and snow, and strong winds across the affected area. Where precipitation falls as rain, flash and areal flooding is possible. Such flooding is possible in low-lying communities near watercourses and other large bodies of water, as well as in urban areas with easily overwhelmed stormwater drainage systems. Sites located downstream of large reservoirs may be subject to flash flooding after relatively short periods of intense rainfall. Precipitation could fall as snow in parts of the affected area over the coming days. Wind gusts could cause blowing and drifting snow; decreased visibility is likely in these areas.

Floodwaters and related debris may render some bridges, rail networks, or roadways impassable, impacting overland travel in and around the affected area. Flooding in urban areas could also result in significant traffic congestion. Heavy snow will likely make driving hazardous in some areas; authorities could implement temporary road closures or detours in such locations.

The disruptive weather will likely cause some delays and cancellations at airports in the region. Flooding or snow could block regional rail lines; freight and passenger train delays and cancellations are possible in areas that see heavy rainfall and potential track blockages.

Disruptions triggered by inclement weather and resultant hazards, such as flooding or strong winds, could persist well after conditions have improved - it could take days before any floodwaters recede and/or officials clear debris. If there is severe damage to infrastructure, repair or reconstruction efforts may result in residual disruptions.