[Data-curation] SA formatted messages from Canada in FM 15 METAR designated WMO headers?

[daryl herzmann <akrherz@xxxxxxxxxxx>]

Greetings,

In today's adventure of curiousity killing the cat, I wonder about the 
following product:

SACN90 CWAO 151600 RRA
WFF SA 1600 AUTO8 M M M 087/18/14/1813+19/M/     PK WND 1920 1510Z 3004 
90MM=
WFP SA 1600 AUTO8 M M M 128/10/09/0902/M/0008 2009 86MM=

So for the TTAAII header of "SACN90", it seems that the usage of 'SA' 
should dictate FM 15 (METAR) format as per:

http://www.wmo.int/pages/prog/www/ois/Operational_Information/Publications/WMO_386/AHLsymbols/TableB1.html

Is this "SA" format some variation on METAR documented somewhere or is the 
WMO header just wrong for this product?

thanks for educating me!
daryl