The winter wildfires that rapidly ignited and spread through Los Angeles from January 7 to 8, 2025, marked a devastating event, with significant implications for communities, insurers and reinsurers. The fires caused widespread destruction, resulting in more than 18,000 destroyed structures and the tragic loss of 29 lives. Early estimates indicate insured losses could exceed $40 billion.
The most destructive fires: The Palisades and Eaton fires
On the morning of January 7, following eight months of severe drought, strong Santa Ana winds reaching over 60 miles per hour quickly escalated a small brush fire in the Santa Monica Mountains into an extensive urban conflagration. Within half an hour, the fire grew twentyfold, spreading into Pacific Palisades, one of the world’s most expensive real estate areas (Figure 1).
Figure 1. Burned areas of the Palisades and Eaton fires, between January 7 to January 31, 2025.
Simultaneously, approximately 40 miles away in the suburbs of Altadena, the Eaton Fire ignited near a high-voltage transmission tower in Eaton Canyon. Southern California Edison, the local electricity company, had proactively shut power to residential lines due to high winds, but power at the high-voltage transmission towers in the hills remained on. Although the exact cause is still under investigation, preliminary analysis points to an electrical arcing event as a potential source of ignition.[1]
The emergency response was overwhelmed: Strong winds grounded firefighting aircraft, hydrants ran dry, fire crews were stretched beyond capacity, and evacuation routes were blocked by abandoned cars. Ultimately, the sheer speed, scale and simultaneous nature of multiple large fires made containment impossible. In total, nine fires ignited and burned an area of 39,000 acres from January 7 to 9.
Three critical questions
The Los Angeles wildfires were catastrophic but not surprising; drier conditions, shifting seasons and expanding urban interfaces have steadily raised wildfire risk for decades, making it easy for anyone relying on wildfire models to be caught off guard if they’re not asking the right questions.
Natural Catastrophe Program 2025
To ensure models remain relevant and robust in this fast-evolving risk landscape, insurers, reinsurers and risk managers must critically evaluate the models they use — whether deterministic weather risk scores such as the Fire Weather Index (FWI), physically-based spread and behavior models or catastrophe models[2] — by consistently asking these three questions:
Models that fail to account for these climatic shifts, particularly those relying solely on historical baselines, will underestimate future wildfire losses, leaving (re)insurers unable to price and manage wildfire risk accurately.
To ensure models remain relevant and robust in this fast-evolving risk landscape, insurers, reinsurers and risk managers must critically evaluate the models they use…
A comprehensive wildfire model should simulate how ember-driven fires enter urban areas, how suppression delays influence growth and how neighborhood layout affects propagation.
References
- Reuters. Southern California Edison shares new details on transmission lines in Eaton amid wildfire probe. (2025). Return to article
- WTW. California wildfires and the future of wildfire risk modeling. (2025). Return to article
- CALFIRE. Statistics. (2025). Return to article
- World Weather Attribution. Climate change increased the likelihood of wildfire disaster in highly exposed Los Angeles area. (2025). Return to article
Author
Models that rely on static or outdated vegetation and land-use data can miss precisely these kinds of compounding, fuel-driven fire dynamics…
