QOTD: Lets stay with the current discussion about running in the heat today. Even if you do not run during the hottest part of the day, it isnt uncommon especially for those of us along the gulf coast to wake up to temps near 80 and high RH% or late afternoon temps still very warm. What are some things you do or would suggest to others to make these runs safe and avoid potential health issues?
ATTQOTD: Oh boy, this is my area of expertise!
In addition to living in FL, I've had heat stroke twice, increasing my susceptibility to further heat stress issues. Here's how I manage:
1. SLOW DOWN. I run by perceived effort, not my numbers on a watch/app. If I feel overheated, overexerted, I know I'm going too fast and I walk slowly for a while, then resume walk/running at a slower pace.
2. SUNSCREEN! I slather it on pre-run, and if I'll be out there for more than 1.5 hours, I bring a little sunscreen stick to reapply.
3. FLUIDS - on the inside! I drink water all day, every day, but in summer, I add Nuun into the mix. The day before a long, hot run, I'll drop a Nuun tab into a 20oz bottle and sip on that through the afternoon. Long runs get a mix of Tailwind and Nuun throughout the run and Nuun after. Short runs get just Nuun. I regularly lose 5-8% of my body weight in sweat on summer runs, so hydration with adequate electrolytes is a big, big deal!
4. SHADE! I'm fortunate to live in an area with lots and lots of big ol' oak trees, so if I time my run for early morning or evening, when the sun is low, 90% of my route will be shaded. I'll even run a certain 1/4 mile section of a park back and forth, over and over, because it stays shaded all day. The temp in the shade seriously feels 15-20* cooler to me.
5. FLUIDS - on the outside! I wear a bandanna tied around my wrist and stop at public water fountains regularly: take bandanna off, soak it in cool(ish - a few degrees cooler than body temp, at least) water, squeeze over my head, down limbs, down neck. Repeat as many times as necessary to bring core temp down a bit. Sometimes I'll take the wet bandanna and drape it across my shoulders/back of my neck and run like that for a while.
6. TAKE IT INDOORS OR TO THE POOL! Some weeks, my body has just hit its limit and can't take another run in the heat, so I'll do a short run inside on the treadmill, or outside in the pool for deep water running. When I need to start building long run mileage in Sept-Oct (still summer here), I'll do 8ish miles outside, then do the remainder inside.
7. RECOVERY! I take it very easy after long, hot runs. I stay inside in the AC, keep sipping fluids, and rest. That part is really critical for the long-term, since the extreme heat here lasts 6 or more months: I find heat stress to be a cumulative thing.
I have some race photos from one HM in November where it was pretty warm for that day up here in NH where I was wearing a black shirt, but in all my race photos it looks like there is a reflection coming off my shoulders. I realized that it was all the salt on my black tshirt turning it gray and making it look like it was shimmering. 
