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The Santa Ana winds are strong, extremely dry down-slope winds that originate inland and affect coastal Southern California and northern Baja California.They originate from cool, dry high-pressure air masses in the Great Basin.When the Santa Ana winds cease, the cool and moist marine layer may re-form rapidly over the ocean if conditions are right.The air in the marine layer becomes very moist and very low clouds or fog occurs.Santa Ana winds are known for the hot dry weather that they bring in the fall (often the hottest of the year), but they can arise at other times of the year.
Los Angeles is in the upper left of this image, and San Diego is near the center.
These winds, which can easily exceed 40 miles per hour (18 m/s), are warm and dry and can severely exacerbate brush or forest fires, especially under drought conditions." This map illustration shows a characteristic high-pressure area centered over the Great Basin, with the clockwise anticyclone wind flow out of the high-pressure center giving rise to a Santa Ana wind event as the airmass flows through the passes and canyons of southern California, manifesting as a dry northeasterly wind.
Santa Ana winds originate from high-pressure airmasses over the Great Basin and upper Mojave Desert.
Chlorophyll concentrations in the surface water go from negligible, in the absence of winds, to very active at more than 1.5 milligrams per cubic meter in the presence of the winds.
During the Santa Ana winds, large ocean waves can develop.