 It's combining meteorology and biology. It's the temperature that your body literally feels. Whenever we say feels like, it's actually not really subjective at all. It's calculated using a complicated formula. Pena explains these conditions are making it hard for our sweat to cool us down properly. Whenever your body is unable to cool itself off, that's whenever heat stroke and heat exhaustion can come into play. In Fairfax County. It's burning. I feel like I'm burning right now. Scott Gellman, WTOP News.