The alert has been issued for La Ronge, Prince Albert National Park and Narrow Hills Provincial Park.

Environment Canada issued a tornado warning for the Municipality of Russell Binscarth at 6 p.m. but has since lowered the alert to a severe thunderstorm warning.

The BC Wildfire Service has been busy this weekend with 73 sparked since Friday, many of them caused by lightning.

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

The storms prompted Environment Canada to issue tornado warnings for some areas after cells showed signs of rotation.

Environment Canada is warning residents in the greater Montreal area to watch out for severe thunderstorms this Wednesday afternoon and early evening.

As of 5:15 p.m. AT, only Grand Falls and Victoria County were under a severe thunderstorm warning.

Researchers say two other tornadoes touched down near Belgrave, Ont., around 5:45 p.m. and near Brussels, Ont., about 15 minutes later.

Environment Canada says thunderstorms will develop off of Lake Huron on Tuesday evening before moving southeast to the western GTA area.

Environment Canada's severe thunderstorm watch includes a warning of damaging winds and even the risk of an isolated tornado.