METAR

[kolenb09]

Below a metar:
270200Z 27007KT 9000 SCT025 BKN300 27/24 Q1013 RMK A2992
Can anyone tell me what the remark RMK A2992 means?

Thanks.

[arem]

Its the Altimeter setting US style - ie in inches 29.92 - which equals 1013 mb

[kolenb09]

I know that for a TAF the FC and FT indicate the validity period.
But I've also come across the prefix SA for METARS and SP voor SPECIs. What does this stand for (SA and SP)? And what do they indacte? A validity period? A METAR is just valid for one hour right?

[Hyperborean]

A METAR is not valid for any time period. It is an actual observation at a specific time. They are normally made at hourly or half hourly intervals. If the weather changes by a significant degree a special observation,SPECI, will be made and issued.

[White Hart]

SA - station actual (current met conditions)
SP - special observation report (ie - a marked change in observation reporting criteria has taken place)