The Santa Ana winds are a regional phenomenon driven by high-pressure systems in the Great Basin and Nevada desert. The mechanism behind this predictability lies in the position of the North Pacific High, a massive area of high pressure that migrates northward during the summer months.
How Urban Heat Island Intensifies Southern California’s Weather Patterns
Seasonal Breakdown of Precipitation The wet season in Southern California is concentrated firmly in the winter months, running from November through March. When this high-pressure system dominates, it acts like a giant atmospheric lid, diverting the Pacific storm track northward and leaving the coast and inland areas under a persistent dome of sinking air that suppresses cloud formation and rainfall.
While Los Angeles International Airport might record a pleasant 75°F (24°C), areas in the San Fernando Valley, such as Woodland Hills, can easily hit 95°F (35°C) or higher. These winds are notorious for being hot, dry, and gusty, creating extreme fire danger by desiccating the chaparral and turning small sparks into conflagrations that can race across the landscape.
How Santa Ana Winds Worsen Urban Heat in Southern California
During this period, the region relies on a series of Pacific storms, known as "atmospheric rivers," to deliver the majority of its annual rainfall. The coastal climate is heavily moderated by the cold California Current, which chills the air above it and creates a stable marine layer, or "May Gray" and "June Gloom," that often blankets the shoreline in low clouds and cool air during the morning hours.
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