Another METAR question
I recently ran into this METAR:
LSZB 300720Z VRB01KT 9000 4000NW FEW003 SCT 037 BKN 055 01/00 Q0997 NOSIG=
Now, what does the NW stand for right next to the visibility? I have a booklet with all the METAR abbreviations but I didn't find anything there. Then, it crossed my mind that NW could mean Northwest to denote the direction where the visibility observation was made (the runway in LSZB is 14/32 so that would make sense).
Any ideas?