A number of areas in central Alberta, including Edmonton, were put under a severe thunderstorm warning on Tuesday.

Environment Canada has placed much of the province under a heat warning which is expected to last through Thursday.

Atlantic Canada is in for a sweltering few days this week.

London is under a heat warning until Monday, according to Environment Canada.

'Sleeping without air conditioning will be very uncomfortable,' Global News weather specialist Mike Arsenault said.

Environment Canada is forecasting slightly cooler weather for Friday, with sunny periods Saturday through Monday.

The National Oceanic and Atmospheric Administration on Thursday upped its seasonal forecast, now predicting a far-above-average 19 to 25 named storms.

Environment Canada has confirmed that at least two tornadoes touched down in Alberta during a stormy night in the province on Monday.

Environment Canada first issued the warnings at around 5:45 p.m. on Tuesday. As of 8 p.m., only Hamilton, Burlington and Oakville were covered under a severe thunderstorm warning.

A number of severe thunderstorms swept through the Montreal area Sunday causing power outages and flooding.