Heatwaves and Health: Guidance on Warning-System Development; 2015 (sólo en inglés)

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Heatwaves are a pervasive natural hazard. Although there is no universally accepted definition, they are understood to be periods of unusually hot and dry or hot and humid weather that have a subtle onset and cessation, a duration of at least two–three days, usually with a discernible impact on human and natural systems.