Canada: Severe weather forecast across parts of far southern British Columbia through at least early June 4

Severe weather is forecast across far southern British Columbia through at least early June 4. Heavy downpours may trigger flash flooding and water pooling on roads. As of late June 2, Environment Canada has issued red rainfall warnings (the highest level on a three-tier scale) across Fraser Valley and Metro Vancouver through early June 3; rainfall of up to 6 cm (2.5 inches) is forecast. Grey special weather statements for mixed precipitation over high elevation passes across the Coquihalla Highway from Hope to Merritt and Highway 3 from Hope to Princeton via Allison Pass are in place through early June 3 and across the Okanagan Connector from Merritt to Kelowna and Highway 3 from Paulson Summit to Kootenay Pass through early June 4. Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming hours.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where heavy rain has saturated the soil. Disruptions to electricity and telecommunications services may occur where significant flooding, landslides, or strong winds impact utility networks.

Floodwaters and debris flows could render some bridges, rail networks, or roadways impassable, impacting overland travel around affected areas. Ponding on road surfaces may cause hazardous driving conditions on regional highways. Authorities could temporarily close some low-lying routes that become inundated by floodwaters.

Severe weather could also trigger intermittent flight delays and cancellations at regional airports, though these are unlikely to be severe or prolonged. Authorities may temporarily suspend port operations if strong winds trigger hazardous sea conditions, impacting freight and passenger maritime traffic. Flooding could block regional rail lines; freight and passenger train delays and cancellations are possible in areas with heavy rainfall and potential track inundation. Localized business disruptions may occur in low-lying areas.