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  1. Dictionary
    heatwave
    /ˈhiːtweɪv/

    noun

    • 1. a prolonged period of abnormally hot weather: "when a heatwave occurs many people become increasingly bad-tempered"

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  2. en.wikipedia.org › wiki › Heat_waveHeat wave - Wikipedia

    A heat wave (or heatwave), sometimes described as extreme heat, is a period of abnormally hot weather. [3] : 2911 Definitions vary but are similar. [4] A heat wave is usually measured relative to the usual climate in the area and to normal temperatures for the season.

  3. dictionary.cambridge.org › dictionary › englishHEATWAVE | English meaning - Cambridge Dictionary

    A heatwave is a period of time when the weather is much hotter than usual. Learn more about the meaning, pronunciation and usage of this word with examples from different sources.

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  5. www.who.int › health-topics › heatwavesHeatwaves - World Health Organization (WHO)

    Heatwaves can burden health and emergency services and also increase strain on water, energy and transportation resulting in power shortages or even blackouts. Food and livelihood security may also be strained if people lose their crops or livestock due to extreme heat.

  6. scijinks.gov › heatWhat Is a Heat Wave? | NOAA SciJinks – All About Weather

    5 days ago · A heat wave is a period of unusually hot weather that lasts two or more days and is outside the historical averages for a given area. Learn how heat waves form, why they are dangerous and how to stay safe during them.

  7. wmo.int › topics › heatwaveHeatwave

    A heatwave is a period of abnormally hot weather that can last from a few days to months and pose serious risks for people and nature. WMO provides guidance, verification and collaboration on heatwave information and warnings.

  8. www.merriam-webster.com › dictionary › heat waveHeat wave Definition & Meaning - Merriam-Webster

    5 days ago · Learn the meaning of heat wave, a noun that refers to a period of unusually hot weather. See examples of heat wave in sentences, synonyms, word history, and related entries.

  9. www.metoffice.gov.uk › types-of-weather › temperatureWhat is a heatwave? - Met Office

    A heatwave is a period of abnormally hot weather, usually lasting at least two days. The Met Office uses a set of criteria to declare a heatwave in the UK, based on temperature, duration and location.