Abnormally Hot Weather
If you are in the area covered by the Tulsa office of the NWS, they have issued a Special Weather Statement covering the forecasted abnormally high temperatures and heat indices expected the next few days.
I'll link it below, but to sum it up briefly, it is going to be unseasonably hot and that can be dangerous this early in the season when folks are not yet fully acclimated to the increased heat.
We've already had a couple of days here in our county in the last week where our heat index hit 103-105 and it was not pleasant. I wimped out and came inside early on those days. I know I am not used to it, and the heat even bothered Tim, which is rare. Remember that it is not just the heat---the humidity can give you a much higher heat index, so drink lots of liquids and be careful.
Here is a link that might be useful: Special Weather Statement