Weather manuals and documentation
In this section, you will find Environment and Climate Change Canada's (ECCC) documentation pertaining to weather forecasting, observing standards, circulars and bulletins. This documentation is managed by ECCC for use by ECCC as well as for other Government of Canada departments and partners.
Clicking on the document cover image will bring you directly to the PDF version of the document. To view the document landing page and HTML versions, where available, click on the hyperlinked document title.
Observer Circular (OBS)
Observer circulars provide instructions concerning new or revised observing procedures and/or new equipment and provide temporary interim instructions. Observer circulars supplement the current edition and amendment of the Manual of Surface Weather Observations (MANOBS) and are incorporated in subsequent editions or amendments.
MANAIR Circular (AIR)
MANAIR circulars supplement the current edition and amendment of the Manual of Standards and Procedures for Aviation Weather Forecasts (MANAIR) and are incorporated in subsequent editions or amendments.
Aviation Weather Observing Bulletins (AVOBS) convey reminders, additional instructions, and clarification of observing procedures to weather observing stations.
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