Right.... but these numbers make no sense.
90 and 95 degrees are not going to reach a heat index of 130 or 160.
Right?
That's the whole point. An average 'hot, humid' day in Louisiana (today, for instance) is 97, with 56% humidity. Water absorbs a lot of energy so if it's more humid, it tends to be a little cooler, so on Sunday when it's going to be 71% humidity, it's only going to be 88. That's the principal behind swamp coolers for instance. Now per
this calculator, today's wet bulb temp is 83.72f, pretty unpleasant but quite survivable if you are drinking water/hitting the shade some. Sunday will be 80.22, so even better.
Now for heat index, per
this calculator, today's heat index is 115. Sunday is 101. That's where those higher values start coming from.
The values we're referencing for a wet bulb event happen around 100f at 85% humidity. That's a wet bulb of 95.8f, neither the 100f or 96f there 'sound' scary, but the heat index is
167f. You've got supersaturated air that's so goddamn hot you may as well be bathing in a pot of boiling water for all the help it'll be cooling you. For additional reference, you get roughly the same wet bulb event at 97f/90% humidity, 96f/95% humidity, and swinging the other way, 101f at 80%, 103f at 75%, 105f at 70%, and 107f at 65%. You can infer the sliding curve from there I imagine.