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. 2021 Nov 26;12:6921. doi: 10.1038/s41467-021-27225-4

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© The Author(s) 2021

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Fig. 5 — a Near-surface fire weather conditions based on the Forest Fire Danger Index, (b) mid-tropospheric fire weather conditions based on the C-Haines Index, (c) dry lightning conditions as key factors for ignitions, (d) daily maximum temperature, (e) annual rainfall deficit and (f) soil moisture (0–23 cm) associated with dryness of the forest system. Changes are calculated as the changes from 1980–1999 to 2000–2019, calendar years, for all variables except for dry lightning to 2000–2016. Grey areas in (e) and (f) denote areas with insufficient data availability.