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
Circulars
Bulletins


Manuals

MANAB cover

MANAB
Manual of Word Abbreviations
3rd Edition

MANCLIM cover

MANCLIM
Manual of Climatological Observations
4th Edition

MANOBS cover

MANOBS
Manual of Surface Weather Observations
7th Edition, Amendment 18

MANUPP cover

MANUPP
Manual of Upper Air Standards
4th Edition (Pending)

MANAIR cover

MANAIR
Manual of Standards and Procedures for Aviation Weather Forecasts
6th Edition

MANICE cover

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.

Observer (OBS) Circular cover image

OBS 1-2012 PDF (accessible); 0.45 MB
Code Table (in eighths) for N, Nh and Ns
Effective December 2012

AVOBS 1-2013 document thumbnail image

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.

Aviation Weather Observing Bulletin (AVOBS) cover image

AVOBS 4-2012 PDF (accessible); 0.43 MB
Recording cloud traces at HWOS equipped sites
Effective December 2012