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The heat index (HI) is an index that combines air temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade. For example, when the temperature is 32 °C (90 °F) with 70% relative humidity, the heat index is 41 °C (106 °F ...
A heat advisory remains in effect until 10 p.m. Tuesday, with heat index values expected to reach up to 104 degrees, according to the NWS.
A heat advisory was in effect through Tuesday night for southeastern Michigan, where forecasters expected actual temperatures to exceed 90 degrees and push the heat index in some areas up to 100.
Several New Jersey counties including Passaic, Hudson, Bergen, Essex, Union and Morris will be under a heat advisory between 11 a.m. and 8 p.m. on Wednesday as heat index values of up to 104 ...
An excessive heat warning is a notice issued by the National Weather Service of the United States within 12 hours of the heat index reaching one of two criteria levels. In most areas, a warning will be issued if there is a heat index of at least 105 °F (41 °C) for more than three hours per day for two consecutive days, or if the heat index is greater than 115 °F (46 °C) for any period of time.
The heat index in Newark, New Jersey, reached 106 °F (41 °C), with the air temperature of 97 °F (36 °C) being a record for September 7. [147] By September 8, Philadelphia 's heat wave reached six days, with two records being set both on the high and low temperature during that six day timeframe. [ 148 ]
A heat wave for Western New York is defined as three or more consecutive days with a heat index greater than 95 degrees. This week, the stretch from Monday through Thursday is expected to fit that ...
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