Drainage wind

From Glossary of Meteorology



drainage wind

Cold-air-runoff winds that are produced when air in contact with terrain surfaces is cooled and flows downslope and/or downvalley.

This generic term is often used to indicate aggregate downslope (katabatic) and downvalley flows, when it is difficult to distinguish between the two. This happens frequently in basins, at the upper end of valleys, in complicated topography where the downslope and downvalley directions are not perpendicular, and in simple valleys when the weaker and shallower downslope flows are masked or overwhelmed by the stronger downvalley flow. Over even gently sloping topography, drainage winds also refer to gravity winds that drain cold air into frost hollows, river valleys, and other lower-lying terrain.
See downslope wind.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. 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.