Definition
A coded section at the end of a METAR or SPECI weather report that contains additional information not covered by the main body of the report, such as significant weather observations, automated station type, sea-level pressure, hourly precipitation, and other supplementary details.
Plain English
The 'extra notes' section at the end of an aviation weather report. Anything important that doesn't fit in the standard format gets added here.
Context Anchor
Seen in METAR weather reports, usually near the end of the report after the main weather information.
Derivation
RMK is a shortened form of “remarks.” Weather reports use many shortened forms so important information can be transmitted in a compact, standard way.
Why Pilots Care
Remarks often include operationally important details such as recent weather changes or automated station type that affect flight decisions.
Intuition Check
RMK is not a weather condition itself. It is a marker that says, “extra notes start here.”
Example Sentence 1
The METAR ended with RMK AO2 SLP125, telling the pilot the report came from an automated station with a precipitation sensor and giving the sea-level pressure.
Example Sentence 2
Pilots reviewed the RMK section to confirm the presence of a recent wind shift.