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Fire weather emergence is already detectable in many burnable areas

A large wildfire burns across a forested mountainside with dense orange and golden smoke rising into a blue sky dotted with white clouds, framed by dark coniferous trees on either side of the valley.
Research area:ClimatologyGlobal and Planetary ChangeClimate change

What the study found

Fire weather conditions are already emerging beyond natural variability in many burnable areas, and projected fire weather is expected to increase widely under warming scenarios. The study also finds that the fire season is likely to lengthen in most regions.

Why the authors say this matters

The authors conclude that these findings highlight the urgent need for strategies to manage wildfire risk and adapt globally. They also suggest that detecting where fire weather has emerged can help track the changing wildfire threat.

What the researchers tested

The researchers examined when and where fire weather conditions exceed natural variability using the Canadian Fire Weather Index (FWI), a measure of conditions that support wildfire spread. They analyzed regional climate simulations from CORDEX-CORE and EURO-CORDEX, global climate models from CMIP5 and CMIP6, and compared historical FWI trends against GEFF-ERA5 reanalysis under RCP8.5 and SSP5-8.5 scenarios from 1980 to 2099, across global warming levels from +1.5 to +4.0 °C.

What worked and what didn't

The CORDEX ensemble matched historical FWI trends better than the CMIP5 and CMIP6 models when compared with GEFF-ERA5 reanalysis. Projections show widespread increases in FWI, mainly driven by higher temperatures and lower relative humidity, with additional regional effects from precipitation and wind. Danger class analyses indicate a shift toward Extreme and Very Extreme conditions in the Mediterranean, southern Africa, South America, and Australia at about 2–3 °C of warming.

What to keep in mind

The abstract does not describe detailed limitations beyond the modeled scenarios, datasets, and warming levels studied. The results are based on specific climate model ensembles and scenario assumptions, so the findings are tied to those inputs.

Key points

  • Fire weather conditions are already emerging beyond natural variability in 39% of burnable areas.
  • Over 25% of land areas are projected to cross emergence thresholds at +1.5 °C, rising to over 70% at +3.0 °C.
  • FWI is projected to increase widely, mainly because of higher temperatures and lower relative humidity.
  • Extreme and Very Extreme fire danger is projected for the Mediterranean, southern Africa, South America, and Australia at 2–3 °C of warming.
  • The length of the fire season is expected to increase in most regions.

Disclosure

Research title:
Fire weather emergence is already detectable in many burnable areas
Authors:
Rita Nogherotto, Francesca Raffaele, Graziano Giuliani, Erika Coppola
Institutions:
Institute of Atmospheric Sciences and Climate, National Institute of Oceanography and Applied Geophysics, National Institute of Oceanography, The Abdus Salam International Centre for Theoretical Physics (ICTP)
Publication date:
2026-01-28
DOI:
10.1016/j.wace.2026.100861
OpenAlex record:
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AI provenance: This post was generated by OpenAI. The original authors did not write or review this post.

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