Many Canadians experienced decidedly un-fall-like weather last weekend, with temperatures soaring into the mid to high 20s across many parts of the country, well above seasonal averages.

People flocked to beaches in Toronto and Ottawa, an unlikely sight for the beginning of October, as the nation's capital broke a heat record, reaching 29.9 C on Sunday. Montreal also reached 29.9 C on Sunday, also breaking a record.

Why is it so warm? Experts point to a massive heatwave in the northern Pacific Ocean as one of the likely culprits.

The unusually warm ocean temperatures are pushing the jet stream north, says Lualawi Mareshet Admasu, an atmospheric scientist at the University of British Columbia.

The jet stream is a narrow band air that flows quickly, west-east, over the Northern Hemispher

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