Canada: Adverse weather forecast across parts of southern Ontario and southern Quebec through early June 6

Severe weather is forecast over parts of southern Ontario and southern Quebec through early June 6. Environment Canada has warned that conditions are favorable for the development of thunderstorms across the affected area; heavy rainfall, strong winds, large hail, and possible tornadoes may accompany storms. Heavy downpours could trigger flooding in low-lying areas, and strong winds could cause property damage and power outages. Authorities have warned people in the affected area to take cover if threatening weather approaches.

As of late June 5, Environment Canada has issued red severe thunderstorms warnings from Keady to Glen Meyer in southern Ontario. Severe thunderstorm watches are in effect across the rest of southern Ontario. Grey special weather statements for rainfall of 3-5 cm (1-2 inches) are in place across parts of southern Quebec. Officials could update and possibly extend the coverage of weather alerts over the coming hours, including possibly issuing tornado warnings.

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- or tornado-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.