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
MANAB
Manual of Word Abbreviations
3rd Edition
MANCLIM
Manual of Climatological Observations
4th Edition
MANOBS
Manual of Surface Weather Observations
7th Edition, Amendment 18
MANUPP
Manual of Upper Air Standards
4th Edition (Pending)
MANAIR
Manual of Standards and Procedures for Aviation Weather Forecasts
6th Edition
MANICE
Manual of Standards and Procedures for Observing and Reporting Ice Conditions
Revised Edition
Circulars
Observer (OBS) Circulars provide instructions concerning new or revised observing procedures and/or new equipment and provide temporary interim instructions. OBS Circulars supplement the current edition and amendment of the Manual of Surface Weather Observations - MANOBS - and are incorporated in subsequent editions/amendments.
OBS 1-2012 PDF (accessible); 0.45 MB
Code Table (in eighths) for N, Nh and Ns
Effective December 2012
OBS 1-2013 PDF (accessible); 0.2 MB
Eliminates the mandatory requirement for a ceiling balloon backup at stations equipped with a laser ceilometer for the determination of cloud-based heights.
Effective May 2013
Bulletins
The Aviation Weather Observing Bulletins (AVOBS) conveys reminders, additional instructions or clarification of observing procedures to weather observing stations.
AVOBS 4-2012 PDF (accessible); 0.43 MB
Recording cloud traces at HWOS equipped sites
Effective December 2012
- Date Modified: