Fig. 4: Increasing compound fire risk across different climate divisions in California from 1990 to 2022. | npj Natural Hazards

Fig. 4: Increasing compound fire risk across different climate divisions in California from 1990 to 2022.

From: Compounding effects of climate change and WUI expansion quadruple the likelihood of extreme-impact wildfires in California

Fig. 4

Time series of IHWRI for a North Coast Drainage; b Sacramento Drainage; c Central Coast Drainage; e San Joaquin Drainage; f South Coast Drainage; and g Southeast Desert Basin. The Northeast Interior Basin in d is excluded from this study due to missing data. The bottom panels show the spatial map of increase in h Integrated Human-centric Wildfire Risk Index; i critical fire-weather days; j wildland-urban interface (WUI) areas; and k WUI housing units from 1990 to 2022. The delta symbol (Δ) denotes the average annual percentage change in IHWRI for each climate division from (a) to (g) over the period from 1990 to 2022 and black lines indicate linear trend lines. The IHWRI values in each time series sub-plot are divided by 1010 for better readability.

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