I don't know. I was just in Northwest Arkansas with 100°F and 99% humidity and then a day later in Phoenix Arizona with 100°F and ≈30% humidity (at midnight!) and it felt similarly oppressive...
People like to throw numbers like 90°F at 90%+ humidity. It doesn't work like this. If you look at the hourly data for Bentonville, AR (Northwest Arkansas) on the hottest day of the month [1] you see that by the time temperature got to 101°F humidity was at 32%. It is sticky as hell, but I guess as a number 30% doesn't sound impressive enough.
[1] https://www.wunderground.com/history/daily/us/ar/bentonville...
No, I do not believe that you were just in Northwest Arkansas with 100°F and 99% humidity.