Canada: Severe weather forecast across parts of northern and western British Columbia and southeastern Yukon through at least early Nov. 7

Severe weather is forecast over southwestern parts of northern and western British Columbia and southeastern Yukon through at least early Nov. 7. A weather front is forecast to bring rainfall to parts of western British Columbia and snowfall and freezing rain are expected in areas further north. Rainfall totals of 7-13 cm (2.8-5.1 inches) are possible in areas where heavy downpours occur and snowfall accumulations of around 20 cm (8 inches) are possible in some northern parts of British Columbia. Flooding is possible in areas where heavy rainfall occurs and hazardous travel conditions are likely in areas where more wintry precipitation falls due to slippery roads and reduced visibility caused by blowing snow.

As of early Nov. 6, Environment Canada has issued red heavy rainfall warnings (the highest level on a three-tier scale) for parts of the North Coast and adjacent inland forecast districts in British Columbia. Red snowfall warnings are in place for the Dease Lake Forecast District in British Columbia and red freezing rain warnings are in place for Wtason Lake forecast districts in far northern British Columbia and southeastern Yukon. 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.