Tuesday, November 3, 2026 · Captain's Challenge
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In Canada, a weather message issued under a WACN header (for example WACN02 CWAO) is:
The answer
4an AIRMET
Explanation
TC AIM MET 5.15, Table 5.1 (AIRMET Identifiers) lists the AIRMET headers WACN01 to WACN07 (ICAO) and WACN21 to WACN27 (national). Canadian SIGMETs use WSCN, with WCCN for tropical cyclone and WVCN for volcanic ash (MET 6.15).
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