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MIAMI VALLEY — In the Miami Valley, a heat wave is classified as three consecutive days or more at or above 90 degrees, according to Storm Center 7 Meteorologist Kirstie Zontini. Since June, Dayton has had 14 90 degree days, and that list will grow this week.
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August 26, 27 and 28 are all expected to reach 90 degrees making it the third heat wave of the summer. June 16-18 and June 30-July 2 were both small heat waves this summer.