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Heat alert issued for Toronto after record 12-month stretch

Toronto issued another heat alert Thursday as temperatures in the low 30s and high humidity are expected to last through the end of the week.

The alert comes in the wake of the hottest 12-month stretch in Toronto in recorded history. Environment Canada tells CityNews that the average temperature at Pearson airport from July 1, 2011 to June 30, 2012 was 10.9 C — well above the average of 7.5 C and a full degree hotter than the previous record of 9.9 C in 2005-2006

Thursday’s forecast high is 30 C, but the mercury will rise as the week wears on, with forecast highs of 32 C for Friday, 31 C for Saturday and 34 C for Sunday.

GO Transit warned train commuters about possible delays due to the heat, as high temperatures can cause steel rails to expand. Speed restrictions will be put in place in certain areas.

High humidity is also forecast to move into the GTA on Friday.

The hot weather is expected to stretch well into next week with temperatures in the low to mid-30s in the forecast.

Check the latest forecast here.

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