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Residents in much of Ontario are bracing for the first major heat wave of the year this week, with Environment Canada forecasting scorching temperatures that could feel like 45 C in parts of the province.The agency has issued a heat warning for an area that spans London to Ottawa, stretching up to Sault Ste. Marie and as far north as Fort Albany.The Greater Toronto Area and other southern parts of the province will see temperatures soar to 35 C starting Monday.