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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.
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.
A heat wave or heatwave, sometimes described as extreme heat, is a period of abnormally hot weather. [ 1 ] : 2911 A time period of five consecutive days is often used to define a heat wave but the exact definition of a heat waves can vary for different countries.
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). This is the first time the temperature exceeded 40 °C (104 ...
a wind chill warning remains in effect until noon cst tuesday. * this is a particularly dangerous situation! * wind chill values: 35 to 65 below...with the coldest readings tonight and monday morning. * impacts: exposed flesh will freeze in 10 minutes with wind chills of 35 below...and in 5 minutes with wind chills of 50 below or colder.
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Extreme cold warning NPW – Dangerously cold air temperatures and/or wind chills, capable of causing life-threatening medical conditions (such as severe frostbite and hypothermia) or death associated with accelerated heat loss from exposed skin, are forecast to meet or exceed locally defined warning criteria for more than three hours over at ...
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