On October 28, 2025, strong Santa Ana winds hit Southern California with gusts up to 45 mph and very low humidity levels of 5%.
Temperatures were 10 to 15 degrees above normal, reaching the low 90s in some valleys. These dry, hot conditions triggered a red flag wildfire warning for mountain and valley areas, where over 11 million people reside near wildlands.
Governor Newsom sent firefighters and resources to prepare for potential fires.​
Dangerous Convergence
A combination of high heat, dry air, and strong winds created ideal conditions for the rapid spread of wildfires.
The rain from earlier in October was insufficient to prevent fires from spreading, as dry plants were already ready to burn.
Approximately 3.7 million Californians now reside in areas designated as having a very high fire risk, according to updated maps. Forecasters warned many people remained at risk as the dry weather continued.​
Seasonal Context
Santa Ana winds occur annually, typically between September and May, with a peak in December or January.
These winds originate from the deserts east of California and intensify as they rush toward the coast, causing the landscape to dry out.
Each year, there are approximately 10 to 25 Santa Ana wind events, some of which can last up to a week. This October episode was typical but more dangerous due to the heat and recent fires.​
This Year’s Deadly Reality
2025 has already been a deadly year for wildfires in California. Deadly January fires killed between 31 and 440 people and destroyed more than 18,000 homes.
The Eaton and Palisades fires were among the worst in history, with over 500,000 acres burned in total for the season so far.
Officials warned that, despite fewer acres burned than usual this fall, fire danger remains very high.​
The Risk Assessment
This October’s red flag warning was Southern California’s first major fire weather event of the fall, hitting areas still recovering from January.
More than 11 million people live in areas where wildland meets neighborhoods, and 3.7 million are in the highest fire risk zones, requiring special building rules and fire safety measures.
Officials described this situation as extremely high risk and urged residents to remain vigilant.​
Geographic Exposure
The warning covered mountainous and valley areas known for strong Santa Ana winds and dry brush, including Ventura County’s Thousand Oaks and Simi Valley, and Los Angeles County’s Santa Susana Mountains near past fire damage sites.
As development spreads into wildlands, more people face serious fire risks every year, raising concerns both for public safety and emergency response.​
Preventive Measures
To prevent fires starting from power lines, Southern California Edison shut off power to thousands of customers in wind-prone areas as a safety precaution.
Southern California Edison began cutting power to over 2,500 customers on October 28 and warned tens of thousands more that they could lose electricity if wildfire conditions worsened.
These planned outages help avoid dangerous sparks but disrupt daily life for many customers.​
State Response
Governor Newsom sent firefighters and equipment to Los Angeles and Ventura Counties before weather conditions worsened.
Cal Fire maintained full staffing and had prepared aircraft ready to respond quickly in the event of fires breaking out.
This plan was built on lessons from January’s deadly fires, aiming to act swiftly and protect communities in fire-prone zones.​
Historical Context
The 2025 fire season is among California’s deadliest, with January fires causing more deaths than many major past wildfires—including the 2018 Camp Fire, which killed 85.
Overall, over half a million acres burned this year, less than some past averages but with a death toll that makes 2025 stand out in recent history.​
Population Exposure
More than 11 million Californians reside in areas where housing meets wildland vegetation.
Nearly 4 million people reside in the highest-risk zones, where strict building codes and safety regulations are in place.
Counties under the latest fire warnings include Los Angeles, Orange, and Ventura, with populations of millions exposed to fire danger and precautionary outages potentially affecting 150,000 residents.​
Resident Preparedness
Fire agencies urge residents in high-risk areas to be ready year-round with emergency supplies and plans.
Experts recommend packing food, water, medicines, important documents, and other essentials into “go bags.”
Officials say wildfires will continue being a constant threat and warn people to stay alert and prepared, even when the weather seems calm.​
Home Hardening
California promotes “home hardening” to make houses more fire-resistant.
Install fireproof roofs, walls, and windows, and clear brush and flammable debris from around your home to maintain a defensible space.
The state offers financial assistance to low-income residents in high-risk areas, enabling them to upgrade their homes. New rules require additional fireproofing in areas close to the most hazardous zones.​
Economic Stakes
The January fires caused losses estimated at up to $275 billion—the most expensive natural disaster in U.S. history.
Thousands of businesses were affected, resulting in job losses and a decline in local economic output.
Experts warn that without improved fire prevention and substantial investment, costs will rise and health risks from smoke and disasters will increase for all Californians.​
Climate Attribution
Scientists say human-caused climate change makes fire conditions about 35% more likely. Warmer temperatures dry the air and plants, making fires easier to start and more difficult to extinguish.
Since 1900, California has warmed almost 2°F, extending and intensifying fire seasons.
Climate change has contributed significantly to the increase in burned areas over the past 50 years and is driving projections for more severe Santa Ana wind seasons in the future.
The Vigilance Imperative
With 11 million living in fire-prone boundaries and California’s rising death toll, officials stress that warning signs like the October red flag must not be ignored.
While 2025 burned fewer acres than average, the deadly toll and expanding risk areas show the danger continues.
Reducing fire risk requires year-round efforts by residents and authorities to ensure safe building practices, clear vegetation, and prevent fires before they start.​