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Heat Index
Heat Index
Using Apparent Temperature Chart
The chart below lists the apparent temperatures (heat index) in degrees Fahrenheight (F). The chart is read by finding the air temperature on the left vertical column and the Relative Humidity (RH) across the top horizontal row and reading where these values intersect. If the ambient temperature is 90 degrees and the RH is 60 percent, then the apparent temperature is 100 degrees.
heat index chart
Effects of Heat
Heat Index Possible Heat Disorder
80-90 F Fatigue possible
90-105 F Sunstroke, heat cramps, heat exhaustion possible
105-130 F Sunstroke, heat cramps, heat exhaustion likely - Heat stroke possible
130 F or greater Heat stroke/Sun stroke highly likely

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National Weather Service Mission: "The National Weather Service (NWS) provides weather, hydrologic, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy. NWS data and products form a national information database and infrastructure which can be used by other governmental agencies, the private sector, the public, and the global community."