Anything after the RMK is practically only used by met people, not by pilots.
AO2
Signifies the type of equipment used.
RAB0557E0606DZB0606E0608
Rain began 0557 ended 0606 Drizzle began 0606 ended 0608
SLP229
Surface level pressure 1022.9 hPa
P0000
Trace of precip observed but not enough to measure
T01080106
Temperature +10.8 celcius, dewpoint +10.6 celcius
There was another thread in the Private Flying forum a few days ago talking about anything the US folks put in the RMK section:
http://www.pprune.org/forums/showthread.php?t=294527
Someone pointed to this great webpage, containing all you ever wanted to know about what the US folks put after the RMK section:
http://www.met.tamu.edu/class/METAR/quick-metar.html
POOOO means the weather's !!!!! !!
Actually, the weather is quite good for flying. Some recent rain, but now visibility of 9 kilometers and clouds at 3500 feet. I'd go!