DETROIT Were at halftime of the heat wave, but the second half will be more intense than the first. And humidity gets just a bit higher, which keeps overnight lows a bit warmer. Put all that together with five previous days of 90-degree heat, and the stretch may start getting dangerous, especially for those that are susceptible to heat illnesses. Heat index readings will be close to our air temperatures Tuesday, but touching triple digits in places on Wednesday and Thursday. Each afternoon, expect a few heat induced downpours with some thunder and lightning.