Metar decoding
 

Hello guys,

Just have a few tricky questions about metar decoding:

MMMX 020551Z 02004KT 12SM SCT020 BKN080 16/12 A3038 NOSIG RMK SLP121 52019 903 8/570 CI

Well, what is 903 stands for? I looked thru out the icao docs, web and still couldn't find any explanation. And where is this derives from? Any AIP?

Second

LPMA 020600Z 01011KT 330V060 9999 FEW016 20/15 Q1019 RS35009/G21KT 0501011KT 2301010KT

As far as Aeroporto Da Madeira is a tricky one I guessed that last two descriptors means wind direction and velocity for RWYs 05 and 23. But what RS stands for? I found some information that it means ROSARIO but as far as I don't speak Portuguese nor Spanish couldn't figuring out exact meaning.

Thank you.

Metar decoding
 

Rosario is correct for Madeira. Its a point abeam final approach NE runway. Don't know about your first question though.

Think the VOLMET quote Ros and Mad.....wondered where the former was:-)