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A generalized view of the heat index showing how the perception of heat by the human body increases with temperature but more rapidly at higher humidity levels. The heat index of a given combination of temperature and humidity is defined as the dry-bulb temperature which would feel the same if the water vapor pressure were 1.6 kPa. Quoting ...
1 — the air temperature in degrees Fahrenheit; 2 — the relative humidity as a percentage; ... 30}} → Heat index for 85 °F, RH 30% = 83 {{heat index|90 ...
A heat index of 95 degrees, for instance, can be reached in different combinations such as 86 degrees with 70% humidity or 90 degrees at 50% humidity. Heat index calculator.
Dangerously hot conditions with heat index values up to 111 degrees anticipated for portions of north and northeast Texas until 9 p.m. Saturday.
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In Florida, except for Miami-Dade County, the National Weather Services offices around the state would issue a heat advisory if the heat index is expected to reach 108 to 112 degrees.
The threshold for a heat advisory in the local area is a heat index reaching at least 100 degrees for two hours, while an excessive heat warning kicks in when the heat index sustains at least 105 ...
Friday's highs will hit the mid-90s, with afternoon dewpoints generally in the mid- to upper 60s. This will lead to heat index values just two to three degrees above actual air temperatures.