How do you prep in a power outage due to an over-capacity system and the heat/humidity combination is no longer compatible with human life?

Essentially, your body cools you down by sweating, but if you reach a combination of sweat and heat above a certain degree, your body is unable to cool you down by sweating, as the air already has enough moisture and its hotter than your sweat.

Then you lose the ability to regulate your heat and you rapidly head towards a heat stroke.

Ok I found this I think I get it https://en.m.wikipedia.org/wiki/Wet-bulb_temperature

It’s the temperature a thermometer will get to through evaporative cooling. You measure it by putting a wet cloth on the bulb of a thermometer and letting the water evaporate.