 and of course when you combine all this it's something called the heat index what it feels like on your skin wtlp scott gellman was out and about in northern virginia today to ask do you know what the heat index really means maybe like how much uv like radiation something like that it's definitely not that that's the heat with the humidity that's much closer and here at tyson's corner center a few shoppers actually did know what the index means and what it might be today man i feel like it's 105.