This map shows the proportion of heatwave disasters between 2001 and 2017, that happened there.
A heatwave is described as a period of abnormally hot and/or unusually humid weather. Typically a heat wave lasts two or more days. The exact temperature criteria for what constitutes a heat wave vary by location.
For a disaster to included at least one of the following criteria must be fulfilled:
Ten (10) or more people reported killed
Hundred (100) or more people reported affected
Declaration of a state of emergency
Call for international assistance
Note: In their 2018 review of ‘Heatwave and health impact research’ Campbell et al. conclude that “When examining the location of heatwave and health impact research worldwide, studies were concentrated on mid-latitude, high-income countries of low- to medium-population density. Regions projected to experience the most extreme heatwaves in the future were not represented. Furthermore, the majority of studies examined mortality as a key indicator of population-wide impact, rather than the more sensitive indicator of morbidity.”
This map uses data by EM-DAT: The Emergency Events Database (last accessed March 2018). We aim to map as complete data as possible and therefore estimate data for missing values. In some cases, missing data for very small territories is not used in the cartogram and that area is therefore omitted in the map.
All modifications to the original data source are noted in our data sheets.
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