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17 Jan 2025

Dry, gusty Santa Ana trade winds have affected the LA region's fire situation for generations

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The recent wildfires in Los Angeles have been significantly exacerbated by the combination of prolonged drought conditions and the powerful Santa Ana winds. 

The region has experienced an extended period without measurable rainfall, leading to extremely dry vegetation. This desiccated plant life serves as highly flammable fuel for fires. The Santa Ana winds, characterized by their dryness and high speeds, further aggravate the situation by stripping additional moisture from the already parched vegetation, making it even more susceptible to ignition. Moreover, these winds can carry embers over considerable distances, igniting new fires and causing existing ones to spread rapidly. 

BBC

The combination of these factors has led to several devastating fires in the area. For instance, the Palisades Fire, which began on January 7, 2025, has burned over 21,000 acres, making it the most destructive fire in Los Angeles County's history. Similarly, the Eaton Fire, also ignited on January 7, has resulted in significant loss of life and property. 

The Santa Ana winds, known for their hot, dry, and gusty nature, have historically played a significant role in Southern California's wildfire activity. These strong, dry winds originate from high-pressure systems over the Great Basin and flow toward the coast, often reaching near-hurricane speeds. 

Their low humidity and high velocity dry out vegetation, creating ideal conditions for wildfires to ignite and spread rapidly.

Other notable incidents include the 2003 Cedar Fire, the 2007 Witch Creek Fire, and the 2017 Thomas Fire, each causing widespread destruction and loss. The winds' seasonal occurrence, usually in the fall, often coincides with the region's driest months, exacerbating fire risks and challenging firefighting efforts.

 

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