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1 day agoA heat warning is in effect for the city of Ottawa as Environment Canadas forecast calls for the hottest weekend of the summer. Environment Canada has issued a heat warning. More Triple Digit Temperatures Through The Weekend Severe Storms Texas Storm Weekend Environment Canada has issued a heat warning for Toronto calling for highs in the 30s with lows in the 20s Saturday and Sunday. . What is an excessive heat warning. It was added to the warning service last year as the UK climate is changing. 1 day agoTHE CANADIAN PRESSSpencer Colby. An excessive heat warning is a notice issued by the National Weather Service. An Excessive Heat Warning sometimes preceded by an Excessive Heat Watch is typically issued within one to three days of the onset of extremely dangerous heat conditions. The Associated Press. Tri-Cities WA heat warning extended. LONDON -- Britains first-ever extreme heat warning is in effe...