The sources I looked at (e.g. [0]) suggest a maximum temperature of 91 F with a humidity of maybe 72 %, equating to a wet bulb of 28.51 C [1].
Are you sure about those temperatures/humidities? 100 F with 99 % humidity equates to a wet bulb of 37.75 C [2], well above the commonly accepted theoretically survivable limit of 35 C.
I remember specifically days where we woke up and it was already 96 degrees and there were still puddles from the rain the previous day.
I think what it means to survive those temperatures may be the issue here, because obviously you don't just drop dead if you are a healthy 18 year old. An obese 65 year old will be long dead in an environment that a healthy 18 year old can run wind sprints in.
Are you sure about those temperatures/humidities? 100 F with 99 % humidity equates to a wet bulb of 37.75 C [2], well above the commonly accepted theoretically survivable limit of 35 C.
[0] https://www.weatherwx.com/hazardoutlook/sc/fort+jackson.html
[1] https://www.omnicalculator.com/physics/wet-bulb?advanced=1&c...
[2] https://www.omnicalculator.com/physics/wet-bulb?advanced=1&c...