Erica's Answer:
Different regions of our country (and the rest of the world) have differing definitions. What we in the Delaware and Lehigh Valleys consider a heatwave would be a welcome cooldown in locations such as Phoenix, where the average afternoon high in June is more than 100 degrees! The definition varies in different parts of the country because the intent is to point out when the weather is going to be much hotter than normal. We want people to take extra precautions during heatwaves, because a sudden warmup can be a shock to your system if you're not expecting it!- Erica
