An Excessive Heat Warning 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 for more than 3 hours per day for 2 consecutive days, or if the heat index is greater than 115°F for any period of time. 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, Heat exhaustion, and other heat-related illnesses.
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Famous quotes containing the words excessive, heat and/or warning:
“The excessive increase of anything often causes a reaction in the opposite direction.”
—Plato (c. 427–347 B.C.)
“We’re having a heat wave, a tropical heat wave.”
—Irving Berlin (1888–1989)
“An overturned cart is a warning to oncoming drivers.”
—Chinese proverb.