Canada: Adverse weather forecast across southern Alberta and far southwestern Saskatchewan through at least early May 8

Severe weather is forecast across parts of southern Alberta and far southwestern Saskatchewan through at least early May 8. As of late May 6, Environment Canada has issued the following warnings:

• Red rainfall warnings (the highest level on a three-tier scale): southern Alberta and far southwestern Saskatchewan. Rainfall of 5-7.5 cm (2-3 inches) is forecast through early May 8.

• Red wind warnings: Brooks, Drumheller, Strathmore, Three Hills, and Vulcan in southwestern Alberta. Northerly winds with gusts of up to 90 kph (56 mph) are forecast to develop early May 7 before slowly weakening the late afternoon to early evening the same day.

Officials may update and extend the coverage of weather alerts 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 or mountainous areas, especially where heavy rain has saturated the soil.

Authorities could issue mandatory evacuation orders for flood-prone communities over the coming days. Disruptions to electricity and telecommunications services are possible where significant flooding or landslides impact utility networks.

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 may temporarily close low-lying routes that become inundated by floodwaters.

Severe weather could cause 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 may occur in flood- or tornado-hit areas; some businesses might not operate at full capacity because of damage to facilities, possible evacuations, and employees' inability to reach work sites.