Region set to sweat out another heat wave

With the temperatures reaching into the 90's again some children found relief in the fountain at Love Park. Here Anthony Smith, 10, of Philadelphia, left, found himself in the company of sisters Haley Brooke Stephenson, 8, second from left, Hannah Butler, 9, and her twin sister Haley Butler, right, on Friday July 5, 2013.The girls are visiting Philadelphia with their parents from Daytona Beach Fla.( Ed Hille / Staff Photographer )
With the temperatures reaching into the 90's again some children found relief in the fountain at Love Park. Here Anthony Smith, 10, of Philadelphia, left, found himself in the company of sisters Haley Brooke Stephenson, 8, second from left, Hannah Butler, 9, and her twin sister Haley Butler, right, on Friday July 5, 2013.The girls are visiting Philadelphia with their parents from Daytona Beach Fla.( Ed Hille / Staff Photographer ) (Ed Hille)
Posted: July 07, 2013

The third - and most-intense - heat wave of the year is underway, and the National Weather Service has issued an "excessive heat warning" for the weekend.

Temperatures won't threaten any records, but heat indexes could reach triple digits the next days, the weather service says.

The warning is in effect from 11 a.m. Saturday until 8 p.m. Sunday as the atmosphere brews a steamy, sultry air mass laden with water vapor.

One indication of the high humidities is the fact that nighttime temperatures won't make it below the low to mid-70s; water vapor inhibits nighttime cooling.

We don't have much room to complain.

So far, this summer hasn't been in a league with recent ones. Three of the last four summers have finished in the top five for overall heat in Philadelphia, in records dating to 1874.

Last month was the wettest June ever officially in Philadelphia, but the average temperature was no great shakes, ending up just a shade above normal.

The heat wave is expected to persist into midweek, with showers reappearing in the forecast Sunday afternoon and showing up every day through next Friday.


Contact Anthony R. Wood at 610-313-8210 or twood@phillynews.com.

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