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Heat Index Contour - -9 hr

Heat Index Contour - -9 hr
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Contour plot of heat index temperatures (F) for the contiguous US. The heat index is the effective temperature of the skin due to the inhibiting effect of humidity to allow the body to cool through sweating and evaporation. Heat index values of greater than 90F are considered high, index values greater than 100F are extreme and index values greater than 110F are considered dangerous.