THE WEATHER IS HOT — proof of global warming! — and here’s some useful advice on heatstroke and heat exhaustion:

Athletic researchers say one of the most frustrating aspects of heat illness is that the sufferer is often completely unaware of his or her own symptoms.

“Your cognitive ability and your capacity to make a rational decision is indeed compromised,’’ said Michael F. Bergeron, director of the environmental physiology laboratory at the Medical College of Georgia. “You hear all the time that the athletes themselves didn’t know enough to stop and didn’t want to stop and have no memory of what happened.’’

I had heat stroke once, and I felt absolutely fine until suddenly I was nauseous, weak, and on the verge of collapse. So beware, and drink lots of water. And don’t let worrying about having to pee stop you. When you’re exercising in the heat, any time you don’t have to pee you’re probably on the verge of dehydration. . . .

UPDATE: Reader Gregory Oman emails:

Glenn,

Regarding your heat stroke link today: Out here in the West it has been cold and wet all Spring. We had snow today in the mountains. Proof of global warming?

Yes. Everything is proof of global warming.