Certainly, here are a few examples of evidence supporting the WHO definition of heatwaves as periods of uncharacteristically high temperatures that increase morbidity and mortality:
[…]
Certainly, here are a few examples (Gasparrini et al., 2015).1
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References
1Yadav N, Rajendra K, Awasthi A, Singh C, Bhushan B. Systematic exploration of heat wave impact on mortality and urban heat island: A review from 2000 to 2022. Urban Climate. 51:101622. doi:10.1016/j.uclim.2023.101622