seen. 128 in arizona. hottest that state has seen. over 275 record high temperatures possible through friday. so this is an incredibly heat wave developing for anyone's standards, especially considering that summer doesn't start for another week. notice this seven-day forecast temps approaching 120 degrees in phoenix, arizona and what the national weather service highlights are the overnight low temperatures failing to drop below 90 degrees. overnight is when you're body is able to recover from the excessive heat. when you don't have the temperatures cooling off beyond 90 degree range, that is what makes this really dangerous territory. the hottest las vegas has ever been in recorded history is 117. you'll notice a couple of attempts to get close to that for the upcoming week. incredible heat wave. >> extraordinary. thank you so much for keeping a close eye on that.