DAYTON, Ohio (WDTN) - The National Weather Service has issues a Heat Advisory for Montgomery and Hamilton counties until 8 p.m. Wednesday, with Heat Index values near to above 100 expected.
A large area of high pressure across the eastern U.S. will allow temperatures to rise into the low to mid 90s today and Thursday.
This third day of +90 temperatures will make it an official heat wave here in the Miami Valley. These conditions will continue right through the end of the week.
An excessive heat watch has also been issued, and is in effect from Thursday afternoon through Friday evening due to the potential for a prolonged period of heat index values near 100 or higher.
"To go along with the heat, we have the humidity. And that is what makes the situation dangerous. When dew points are high, the air has a high moisture-content and evaporation is slowed significantly," Storm Team 2 Meteorologist Jamie Jarosik explains. "Sweating is our body's way to cool us off, as evaporation is a cooling process. But the sweat won't evaporate efficiently into a muggy airmass. So it puts stress on us physically to stay cool and this makes it feel even hotter - thus, the heat index, or "feels like" temperature."
Jarosik says relief is coming Saturday, as a cold front moves through with the best rain chance likely in the morning and early afternoon, and that will bring a drop in temperature and humidity.
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