Environment Canada says a heat wave descending on parts of Ontario this week is expected to bring dangerously high temperatures.

The weather agency has issued a heat warning starting Monday for an area that spans London to Ottawa, stretching up to Sault Ste. Marie and as far north as Fort Albany.

Temperatures in the Greater Toronto Area and Ottawa could feel as hot as 45 C with the humidity.

Environment Canada says temperatures in the Greater Toronto Area and Ottawa could feel as hot as 45 C with the humidity.{ai:summary}<p>Heat wave hits Ontario, bringing dangerously high temps. Heat warning in effect from London to Ottawa. GTA and Ottawa could feel as hot as 45 C. #health</p>

Dangerously high temperatures are coming to much of Ontario: Environment Canada

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