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Latest news, analysis and updates about heat index from Zorywire.

National Weather Service heat advisories are in effect today for parts of southeast Louisiana, southern Mississippi and South Florida. Heat index values are expected to reach as high as 108 to 109 in the advisory areas.

The National Weather Service says a heat advisory remains in effect for Houston and many Southeast Texas communities through Saturday night. Heat index values could reach 107 to 112 degrees, making air conditioning, hydration and limited outdoor activity important.