 Referred to as any consecutive three-day period with temperatures above 90 degrees. AccuWeather.com meteorologist Matt Rinde says we've got a few areas experiencing that this week. It will be a hot day from New England into the Middle Atlantic and Tennessee Valley. Highs in these areas will be well into the 90s with a few triple digits in the mix. And AccuWeather real field temperatures will be well over 100 for most.