A Heat Advisory is issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. A warning will be issued if there is a heat index of at least 105°F but less than 115°F for less than 3 hours per day or if nighttime low temperatures are above 80°F for 2 consecutive days. High values of the heat index are caused by temperatures being significantly above normal and high humidities, and such high levels can pose a threat to human life through conditions such as heat stroke.
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