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In international usage, a change in wind direction in a clockwise sense (for example, south to southwest to west) in either hemisphere of the earth.
According to widespread usage among United States meteorologists, a change in wind direction in a clockwise sense in the Northern Hemisphere, counterclockwise in the Southern Hemisphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The change of direction of wind in a clock-wise direction. The change of direction of wind in an anticlock-wise direction is known as backing. See backing.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved