Yesterday, when I returned to my house from my 35.4-mile bike ride, the temperature in my zip code, according to the Weather Channel app on my iPad, was 103º Fahrenheit, but the heat index was only 98º or 100º (I forget which). How can this be?, I wondered. Doesn't the heat index have to be at least as high as the temperature? The answer is no, as this page explains. You learn something every day.
Addendum: If the heat index can be lower than the temperature, as it was yesterday, can the wind chill be higher than the temperature? I suspect not, but I may be wrong.
Addendum 2: The official high temperature yesterday at DFW Airport was 106º. That's the highest temperature in three years on a day in which I rode my bike.
