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Cooling off in Kiefer Creek

Donald Vance, from Valley Park, pulls his granddaughter, Alivia Alley, 9, towards the bank of Kiefer Creek in Castlewoood State Park on Monday, July 27, 2015. The cold, spring-fed creek is a popular place to cool off from the heat. Photo by J.B. Forbes, jforbes@post-dispatch.com

Wednesday will be another rough day on the heat front, with the National Weather Service putting the St. Louis region under an excessive heat warning.

The forecast calls for temperatures in the low 90s, but a heat index (which factors in humidity) approaching 107 degrees. Making matters worse is the fact that this is the fourth consecutive day of extreme temperatures.

"It's kind of a cumulative effect on the body," said Jon Carney, a meteorologist in the weather service's Weldon Spring office.

That makes it particularly rough on people without air conditioning or those who work outdoors, he said.

There is a bit of good news, however.

A cooling front is on its way and should hit the area later Wednesday evening.

Thursday forecasts call for temperatures in the upper 80s, but with a matching heat index. So it could seem 10-15 degrees cooler.

"It's going to feel a lot better tomorrow," Carney said.

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Timothy Barker is a reporter for the St. Louis Post-Dispatch.