What Is the Heat Index?

© BRIAN SNYDER/Reuters/Corbis

While the notion of humidity making days feel warmer is painfully apparent to anyone who’s ever been outside on a soupy day, our current system owes a big debt to Robert G. Steadman, an academic textile researcher. In a 1979 research paper called, “An Assessment of Sultriness, Parts I and II,” Steadman laid out the basic factors that would affect how hot a person felt under a given set of conditions, and meteorologists soon used his work to derive a simplified formula for calculating heat index.


  1. circa-eightyfour reblogged this from discoverynews
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  4. kuudandere reblogged this from mentalflossr and added:
    dude, “An Assessment of Sultriness” sounds really sexy
  5. pardonmydandyism reblogged this from thelittleemma
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  13. ornamentedembellished reblogged this from nanner and added:
    "An Assessment of Sultriness" sounds like a pretentious, pseudo-Southern Gothic novel.
  14. ladonnapietra reblogged this from nanner and added:
    See also: why I am never leaving the desert unless it is to go back to the Inland Pacific Northwest.
  15. scifitwin reblogged this from mentalflossr and added:
    I can answer this simply. After a certain point it’s just fucking hot. It doesn’t matter how it feels. It’s just too...
  16. nanner reblogged this from shesarejector and added:
    Am I the only one amused by “An Assessment of Sultriness”?
  17. shesarejector reblogged this from mentalflossr and added:
    Dammit Robert G. Steadman, without your “discovery” we’d all be so much better off only knowing the actual heat vs. how...
  18. religionisbullshit reblogged this from mentalflossr