First, let me welcome Lane back;
I hope your sabbatical was productive and recharged your batteries! Second, I would also suggest a corollary to the equation, No Wind + Heat = Dead Grass, and that is: Heat + Rain = Dead Grass.
Another area where stress begins to rear its ugly head is in the area of water management- too much, and not enough.
All too often, we see situations where relative humidity is high, and "hand watering" is done to "cool the plants off". Unfortunately, when RH is high, very little of the water
you put down will evaporate, and this creates the potential for several bad things to happen. As Lane described in his post, fans are incredibly important especially in the Southeast because of the need to reduce the local relative humidity so that the plants can manage the heat.
Fungicide programs are also showing excellent differences, and you can tell the difference between those that perform and those that miss a key disease this year.
To give you an idea of just how we are doing this year, a superintendent in TN sent the following out to his colleagues, and I thought it was interesting: