The surprisingly scary 'heat index:' How much do you know?

When temperatures get as hot as they were this past weekend in the Midwest (upper nineties and into the triple digits) the weather man ends up talking more about the heat index it seems than anything else. So how hot is too hot, especially when it comes to the heat index measurement? Obviously it depends on what you want to do outdoors, but you may be surprised at how quickly the heat index can climb to dangerous levels.

According to the National Weather Service the heat index starts to become hazardous at 104º, but it's extremely dangerous once it gets to 126º. Sound impossibly hot? Not really -- just a temperature of 92º combined with a relative humidity of 85% will get you there. Here in Iowa that's at least half the summer -- be careful out there!