27 Apr 2022 | 11:06 AM UTC
Canada: Adverse weather forecast across western Alberta and northeastern British Columbia through at least April 29
Heavy rainfall and snowfall forecast across parts of western Canada through April 29. Possible transport, business, and utility disruptions.
Event
Adverse winter weather, including heavy snow and heavy rainfall, is forecast across parts of western Alberta and northeastern British Columbia through at least April 29. Snowfall accumulation of up to 20 cm (8 inches) and rainfall totals of up to 3 cm (1 inch) are expected across parts of the affected area. The rainfall may trigger flooding and landslides, especially in areas where frozen ground reduces the ability to absorb rainwater. Heavy snowfall and strong winds will lead to hazardous driving conditions due to slippery roads and reduced visibility.
As of early April 27, the Meteorological Service of Canada has issued the following warnings and advisories across the affected area:
Red snowfall warnings (the highest level on a three-tier scale): Peace River-Fairview-High Prairie-Manning and Whitecourt-Edson-Fox Creek-Swan Hills in Alberta; and B.C. Peace River, Fort Nelson, and Muncho Lake Park-Stone Mountain Park in B.C.
Red rainfall warnings: Grande Prairie-Beaverlodge-Valleyview, Peace River-Fairview-High Prairie-Manning, and Whitecourt-Edson-Fox Creek-Swan Hills in Alberta.
Special weather statements for a mix of snow and rain: B.C. Peace River and Williston in B.C.
Officials could update and possibly extend the coverage of the relevant weather alerts over the coming days.
Hazardous Conditions
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 across parts of the affected area over the coming days, especially over higher ground. Wind gusts could cause blowing and drifting snow; decreased visibility is likely in mountainous areas. Rain-induced landslides cannot be discounted in areas of elevated terrain; there is also the possibility of avalanches in mountainous areas where the snowpack has become unstable due to heavy snowfall. Power outages could occur throughout the affected area.
Transport
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. Mountain passes and tunnels could be closed as a precautionary measure during periods of intense snowfall.
Advice
Monitor local media for weather-related updates and advisories. Confirm all transport reservations and business arrangements before traveling in the affected area. Seek updated information on road conditions before driving or routing shipments through areas where severe weather is forecast; plan for possible supply chain disruptions throughout the affected areas. Stay away from elevated streams, creeks, and other watercourses that are prone to flash flooding. Do not attempt to navigate flooded roadways. Exercise caution in elevated terrain due to the threat of landslides, as well as mountainous regions where avalanches pose a threat. Charge battery-powered devices in the case of prolonged electricity outages.
