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A quantity expressing the discomfort felt as a result of the combined effects of the temperature and humidity of the air.
- ‘An excessive heat warning is issued when a heat index of at least 105 degrees for more than 3 hours per day for two consecutive days, or a heat index more than 115 degrees for any period of time is expected.’
- ‘Temperatures reached the mid-nineties on Wednesday and the heat index soared past 105 degrees with intense humidity levels.’
- ‘If the air warmed to 95 degrees and the dew point stayed at 71, the relative humidity would be 44% and the heat index would be 101 degrees.’
- ‘The first thing I do is fetch ice ($8 for a regular-size bag), a job that is hugely important because the heat index, with the humidity and asphalt, is roughly 174 degrees.’
- ‘External heat comes from a combination of environmental temperature and humidity, known as the heat index.’
- ‘Just as the wind chill attempts to measure how cold it feels under certain wind conditions, the heat index tries to measure how hot it feels given the humidity.’
- ‘Thank God for the trees that shade the tracks as the humidity was up and the heat index was 115 degrees.’
- ‘Then there's the fact that the temperature heat index is supposed to climb past 103 today.’
- ‘It's hard to feel inspired to do anything - much less blog - when the temperature is 95°, the heat index is 110 and the sun is curling back the shingles on the roof and turning the driveway into a strip of burning black goo.’
- ‘Be sure to keep water readily accessible for drinking and for helping your body cool down, check the weather for that day's heat index, and notice your body's signals.’
- ‘Those changes could include higher maximum temperatures and more hot days over nearly all land areas, increased heat index over land areas and an increase in tropical cyclone peak wind intensities.’
- ‘The temperature was 104 degrees on the flight deck before we started some 30 jet engines, with a heat index around 120.’
- ‘It will also read temperature, humidity, dew-point, wet bulb temperature, wind chill index, heat index, barometric pressure and altitude.’
- ‘At a heat index of 80-90 F., we may experience fatigue, which can lead to more severe complications.’
- ‘Temperatures can be in the 100s during summer months, but low humidity in the 10 to 20 percent range keeps the heat index down.’
- ‘I didn't really have an agenda, but I did take care of some errands that I've been meaning to run and haven't been able to, trapped in the house with the baby either by precipitation or a heat index topping 100 degrees.’
- ‘The 90 + degrees with a heat index of over 100 was getting a little old.’
- ‘Given good, well-drained soil and regular watering, hydrangeas grow rapidly and can be exposed to sun or shade, depending on the heat index of your zone.’
- ‘Sunday's card went on as scheduled with the temperature at 93 degrees and the heat index at 104 degrees.’
- ‘In western Tennessee the heat index has surpassed 100 degrees.’
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