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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.
Heat index values up to 108 degrees for portions of north central and northeast Texas until 7 p.m. Sunday. ... in vehicles when car interiors can reach lethal temperatures in a matter of minutes ...
A heat advisory is a notice issued by the National Weather Service of the United States. Local offices often have their own criteria. Local offices often have their own criteria. 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 ...
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.
Summer heat scorched Texas and the Southwest on Wednesday, pushing Phoenix to nearly 90 consecutive days of triple-digit temperatures and putting millions of people under excessive heat warnings.
Texas has been baking in record heat since the weekend, and the rest of the week will be no exception. Record highs are expected Thursday from Roswell, New Mexico, to Galveston, Texas, forecasts show.
In a heat wave beginning on 8 July, the United Kingdom saw its first ever red extreme heat warning, with a national emergency declared on 15 July. [19] An unconfirmed report from the Met Office on 19 July indicated a new record temperature for the United Kingdom, 40.3 °C (104.5 °F).
In the U.S., more than 107 million people from the Great Lakes south to Texas and Louisiana could find themselves part of an “extreme heat belt” in the decades ahead.