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.

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

A tornado warning was in effect for part of east-central Alberta shortly before 8 p.m. on Monday as stormy weather that began earlier in the day continued to pound central and southern parts of the province.

Environment Canada issued heat warnings for most of Alberta, saying over the long weekend temperatures will reach the high 20s to low 30s and not drop much overnight.

Watches are issued when conditions are favourable for thunderstorms that could produce large hail, damaging winds or torrential rainfall, Environment Canada says.

The ridge of high pressure is anticipated to roll in by Sunday, when daytime highs could hit the low 30s. 

Maximum temperatures could range between 28 C and 32 C but with the humidex it could feel more like 39. 

Environment Canada said Tuesday that further investigation of a tornado that touched down near Nanton, Alta., on Sunday has unearthed evidence the twister was more powerful than first thought.