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I just deployed a Mastodon bot that posts forecasts for the most dangerous upcoming heatwaves

You can follow it at

@heatwave

To determine how dangerous a heatwave is, it uses wet-bulb temperature, which is the temperature that a body can be cooled to by evaporation

Sweating works to cool you because generally the wet-bulb temperature is lower than body temperature

As wet-bulb temperature increases and approaches body temperature, people can no longer cool themselves by sweating and will die