Beginning in 1975, the American Meteorological Society (AMS) adopted a strong International System of Units (SI) policy for its publications. AMS policy on SI units is explained in the Authors' Guide, published in 1983. This article serves as a review and update on the use of SI units in technical writing. Authors should use SI-unit guidelines both in submission of journal articles as well as in “camera- ready” publications for the AMS.

These guidelines, based on agreements among many international and national standards organizations, will help avoid confusion in the use of SI units and terminology. Footnotes are used to reflect current AMS editorial policy.

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1 Cooperative Institute for Research in the Atmosphere (CIRA), Colorado State University, Fort Collins, CO 80523

2 United States Metric Association (USMA), 255 Mountain Meadows Road, Boulder, CO 80302.