thirstwave noun [C]
UK /ˈθɜːstweɪv/ US /ˈθɝːstweɪv/
a period of hot, dry weather that causes soil and plants to lose a very large amount of water to evaporation

During a thirstwave, the atmosphere essentially goes into overdrive, demanding more moisture than usual. From 1981 to 2021, thirstwaves across the United States averaged 0.8 millimeters per day above normal, lasted about 4 days, and occurred nearly 3 times per growing season.
[earth.com, 14 April 2025]

firewave noun [C]
UK /ˈfaɪəweɪv/ US /ˈfaɪrweɪv/
a series of fires that burn strongly and out of control on an area of grass in a city, usually triggered by very hot weather

Cities across the UK are facing a growing threat from an emerging phenomenon called “firewaves” as temperatures rise due to climate change, scientists have warned. Guillermo Rein, professor of fire science at Imperial College London, has been working alongside the London Fire Brigade to help predict when conditions are ripe for a “firewave”.
[bbc.co.uk, 14 August 2025]

smog wave noun [C]
UK /ˈsmɒg ˌweɪv/ US /ˈsmɑːg ˌweɪv/
a period of extreme and long-lasting air pollution, where a mixture of smoke, gases, and chemicals in the atmosphere make it difficult to breathe and can be harmful for health

Authorities in eastern Pakistan have closed public parks, zoos, museums, historical buildings and playgrounds for 10 days as a record-breaking “smog wave” choked 18 districts of Punjab province, leaving tens of thousands of people ill. Lahore residents went about their lives in a twilight gloom that lingered over the city for hours, reducing visibility to around 100 metres.
[jerseyeveningpost.com, 8 November 2024]

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