Irrigation certainly helps relieve the stress, but when it becomes so hot, and there is an extraordinary amount of nitrogen introduced into the plant, there is that much more stressed. Turns are always the most susceptible as a certain amount of pulling and tearing occurs (crushing the already stretched cell structure of the plant), but it can even happen in straight runs if the turf is stressed enough.
Thank you, Dad - for always being the dad that you were. You truly are my hero. You always were.