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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.
CNN is tracking extreme heat conditions for Americans each day. See where the risks are greatest — and where high temperature records might be broken. Extreme heat: Tracking temperatures and ...
At 3 p.m., the temperature was 102.9 and the heat index was 110.7 degrees. By 4 p.m., the temperature had dipped to 95 and the heat index to 103.8 degrees. July 5’s average high temperature is ...
An excessive heat warning, the highest alert level on a four-tier scale, means everyone needs to take precautions to stay safe in the heat because "you may become seriously ill or even die," the ...
An excessive heat watch is a notice issued by the National Weather Service of the United States when the high temperatures reach anywhere within the range of 95 °F (35 °C) and 100 °F (38 °C) in the continental US.
Excessive heat watch NPW – Conditions are favorable for an excessive heat event with extreme Heat Index values during the day, combined with nighttime low temperatures of 80 °F (27 °C) or higher that limit perspiration recovery, are forecast to occur to meet or exceed local Excessive Heat Warning criteria in the next 24 to 72 hours. [32]
It gives people time to prepare for the weather. Heat advisory: A heat advisory is issued within 12 hours of extreme heat conditions. Typically, the heat index will be above 100 degrees and the ...
In Ireland, a rare tropical night was recorded in Valentia, Kerry on 5 September, with the overnight temperature not dropping below 22.3 °C (72.1 °F) at the weather station. [86] A high temperature warning was also issued for parts of Ireland on 7 September, as some parts of the country were forecast to reach as high as 31 °C (88 °F). [87]
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