 And of course, when you combine all this, it's something called the heat index, what it feels like on your skin. WTOP's 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.