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Re:Canada weather: Dozens dead as heatwave shatters records by lucozade on Wednesday June 30, 2021 @10:00AM (#27688625)
> But I've read once

It's best not to assume what you read on the internet is always true. Some people post things that turn out to be utter nonsense. Easily checkable nonsense to boot.

Re:Canada weather: Dozens dead as heatwave shatters records by elorant on Wednesday June 30, 2021 @10:05AM (#27688681)
It's explained further down in the comments. It's the so called wet bulb temperature. I was wrong about the 15 minutes limit though, turns out it's about two hours.