Santa ana

From Glossary of Meteorology

Santa Ana

In the United States, a dry, foehnlike desert wind in southern California, generally blowing from the northeast or east, especially in the pass and river valley of Santa Ana, California, and other nearby passes, where it is further modified as a mountain-gap wind.

It is driven by strong pressure gradients from an anticyclone over the Great Basin of the western United States. It blows, often hot and sometimes with great force, from the deserts to the east of the Sierra Nevada Mountains and may carry a large amount of dust. The combination of heat, dryness, and strong winds make it an especially hazardous fire weather condition. It most frequently occurs in late fall and winter (October–March); when it comes in spring, however, it can do great damage to fruit trees.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.