6/27/2023 0 Comments Santa monity humidity levelDamage from high winds is most common along the Santa Ana River basin in Orange County, the Santa Clara River basin in Ventura and Los Angeles County, through Newhall Pass into the San Fernando Valley of Los Angeles County, and through the Cajon Pass into San Bernardino County near San Bernardino, Fontana, and Chino. The longest recorded Santa Ana event was a 14-day wind in November 1957. A Santa Ana can blow from one to seven days, with an average wind event lasting three days. There are typically about ten to 25 Santa Ana wind events annually. They often bring the lowest relative humidities of the year to coastal Southern California, and "beautifully clear skies." These low humidities, combined with the warm, compressionally-heated air mass, plus high wind speeds, create critical fire weather conditions and fan destructive wildfires. Santa Ana winds are known for the hot, dry weather that they bring in autumn (often the hottest of the year), but they can also arise at other times of the year. They originate from cool, dry high-pressure air masses in the Great Basin. The Santa Ana winds (sometimes devil winds) are strong, extremely dry downslope winds that originate inland and affect coastal Southern California and northern Baja California. Los Angeles is in the upper left of this image, while San Diego is near the center. The Santa Ana winds sweep down from the deserts and across coastal Southern California, pushing dust and smoke from wildfires far out over the Pacific Ocean.
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