Canada: Severe weather forecast over western regions through at least July 24

Thunderstorms and heavy rainfall are forecasted across parts of western Canada through at least July 24. Strong winds and hail are possible during storms. As of early July 23, Environment Canada has issued red heavy rainfall warnings (the highest level on a three-tier scale) for parts of northern British Columbia, southwestern Northwest Territories, and southeastern Yukon. Red severe thunderstorm warnings have been issued for parts of northeastern British Columbia, and yellow severe thunderstorm watches are in place for parts of northwestern Alberta and eastern and northeastern British Columbia. 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 located downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly areas, especially where heavy rainfall has saturated the soil.

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

Severe weather may trigger flight delays and cancellations at airports across the affected region. 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 could occur in flood-hit areas; some businesses might not operate at full capacity because of damage to facilities, possible evacuations, and some employees' inability to reach work sites. Strong winds could also cause power outages.