A heat wave is a prolonged period of excessive heat, generally 10 degrees or more above average, often combined with excessive humidity. You will likely hear weather forecasters use these terms when a heat wave is predicted in your community.
Heat wave definition is - a period of unusually hot weather. Recent Examples on the Web By next Tuesday, another heat wave is expected to bring temperatures back into the triple digits. — Jay R. Jordan, Houston Chronicle, "Heat advisory for Houston area today, triple-digit ‘feels like’ temps in forecast," 9 June The heat wave that ended May and is carrying over into June has a lot.
1 hour ago · A heat wave is defined as a period of abnormally and uncomfortably hot weather. Typically a heat wave lasts two or more days. Here in the Valley, we consider a stretch of 90°+ days a heat wave.