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tips:heatindex

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 tips:heatindex [2015/01/27 13:08]splitbrain tips:heatindex [2015/01/27 13:12] (current)splitbrain added short intro Both sides previous revision Previous revision 2015/01/27 13:12 splitbrain added short intro2015/01/27 13:08 splitbrain 2015/01/27 00:25 jt3 [Explanation] 2015/01/26 23:52 jt3 [Explanation] 2015/01/26 23:50 jt3 [Examples] 2015/01/26 23:50 jt3 2015/01/26 23:49 jt3 created 2015/01/27 13:12 splitbrain added short intro2015/01/27 13:08 splitbrain 2015/01/27 00:25 jt3 [Explanation] 2015/01/26 23:52 jt3 [Explanation] 2015/01/26 23:50 jt3 [Examples] 2015/01/26 23:50 jt3 2015/01/26 23:49 jt3 created Line 1: Line 1: ====== Calculating Heatindex ====== ====== Calculating Heatindex ====== + + The heat index (HI) is an index that combines air temperature and relative humidity in an attempt to determine the human-perceived equivalent temperature—how hot it feels. The result is also known as the "felt air temperature"​ or "​apparent temperature"​. + + This tells you how hot a day "​feels"​. See also [[tips:​windchill|Caclulating Wind Chill]] for cold days. ===== Example ===== ===== Example ===== + ====Fahrenheit==== ====Fahrenheit==== ​Text: ​ ({wt}<80 and {wt} or {wh}<40 and {wt} or math.floor(-42.379+(2.04901523*{wt})+(10.14333127*{wh})+(-0.22475541*{wt}*{wh})+(-.00683783*({wt}^2))+(-.05481717*({wh}^2))+(.00122874*{wh}*({wt}^2))+(.00085282*{wt}*({wh}^2))+(-.00000199*({wt}^2)*({wh}^2))+.5)) .. "​ᵒF"​ ​Text: ​ ({wt}<80 and {wt} or {wh}<40 and {wt} or math.floor(-42.379+(2.04901523*{wt})+(10.14333127*{wh})+(-0.22475541*{wt}*{wh})+(-.00683783*({wt}^2))+(-.05481717*({wh}^2))+(.00122874*{wh}*({wt}^2))+(.00085282*{wt}*({wh}^2))+(-.00000199*({wt}^2)*({wh}^2))+.5)) .. "​ᵒF"​