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--- tips:heatindex [2015/01/26 23:25] – [Explanation] jt3
+++ tips:heatindex [2015/01/27 12:12] (current) – added short intro splitbrain
@@ Line 1: / Line 1: @@
+====== 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 =====
 ====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"