The author of "There's An AC For That" (June 2016) suggested "the AC on weather services is surely due for an update." Evidently she was using an old version of AC 00-45G. The picture shown in the article is the title page from AC 00-45G Change 1, dated July 2010. The FAA updated this AC to Change 2 in October 2014 with many important updates. This gets into how these various Advisory Circulars are updated. Once an AC is issued, it's assigned a number and a version letter, such as AC 00-45G, Aviation Weather Services. That version can be revised by issuing changes. So, the full specification of the most recent document is AC 00-45G, Change 2. The main document-original version-is what is returned by the various searches; you've got to dig just a bit further to find the changed versions. When/if the FAA feels that a completely new version of the publication is appropriate, they'll rewrite it as needed, and issue the new version with a new letter: AC 00-45H.
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