Manuals, Standards, Circulars and Bulletins
In this section, you'll find Environment Canada's documentation pertaining to aviation weather forecasting, observing standards, circulars and bulletins. This documentation is managed by Environment Canada for use by Environment Canada as well as for other Government of Canada Departments and partners.
Manuals
Manual of Word Abbreviations
Manual of Climatological Observations
Manual of Surface Weather Observations

Circulars
Obs Circulars provide instructions concerning new or revised observing procedures and/or new equipment and provide temporary interim instructions.
Note: All observer circulars are now incorporated into MANOBS 7th Edition, Amendment 18.
- Date Modified: