Written with AI assistance and may contain mistakes. Verify against the official Transport Canada publications before relying on anything here.

TAF Remarks (RMK Line)

Canadian TAF RMK line: fixed menu of standard remarks, not raw weather data. Four kinds only:

Remark	Example	Meaning
Auto obs basis	`FCST BASED ON AUTO OBS`	Built from METAR AUTO (AWOS) observations, not a human observer
Next forecast	`NXT FCST BY 290000Z`	UTC date/time of next regular TAF. Normally ends the TAF
Partial observing program (e.g. no night-time observations)	`NXT FCST WILL BE ISSUED AT 291045Z`	Last regular TAF of day says when coverage resumes
Possible discrepancies	`AUTO OBS REPG NON-REPRESENTATIVE WND SPD` or `AUTO OBS REPG NON-REPRESENTATIVE VIS`	Forecaster believes AWOS reading not representative of aerodrome

METAR RMK differs: cloud layers, sea level pressure and the like (TC AIM MET 8.1).
AWOS-based TAF: only marker is closing FCST BASED ON AUTO OBS. Format otherwise unchanged.
Amendment and cancellation rules: see taf-amendment.

Trap: expecting TAF RMK to report observed conditions like a METAR RMK. Limited to the four items above.

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