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low index
A relatively low value of the zonal index which, in middle latitudes, indicates a relatively weak westerly component of wind flow (usually implying stronger north-south motion), and the characteristic weather attending such motion; a circulation pattern of this type is commonly called a low-index situation.
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From McGraw-Hill Dictionary of Environmental Science.  The Content is a copyrighted work of McGraw-Hill and McGraw-Hill reserves all rights in and to the Content.  The Work is © 2008 by The McGraw-Hill Companies, Inc.
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