Want to learn more about the heat index after this week's extreme heat? Take a deeper look into what heat index actually means
One caveat to heat index measurements: The calculations and values assume a location is in shade. Direct sunlight can add as many as 15 degrees onto the heat index.
Here’s why the heat index matters: It paints a more accurate picture of dangerous conditions than temperature alone. The difference in how people respond to temperatures when the heat index is a factor can be dramatic. The summer of 1988 saw blistering heat, more sustained than what Chicago experienced in the summer of 1995. Yet in 1995, more than 750 people died of heat-related causes. What set 1995 apart,, was the relative humidity, which caused the heat index to soar to 125 degrees in ‘95.
The National Weather Service issues excessive heat warnings when heat indices are forecast to reach levels likely to result in heat exhaustion or heatstroke. People are encouraged to stay hydrated; limit strenuous outdoor activity and sun exposure; and to check on relatives and neighbors, particularly elderly adults and vulnerable individuals.
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