Hi Jack

Seems to be a Sensor Status Indicator on USA Metars - see
http://www.met.tamu.edu/class/METAR/quick-metar.html for explanation (near bottom of page). So
it would mean Cloud Height Indicator NOt available .

Regards
Roy Avis
Bracknell Weather/Webcam updated every minute plus Latest Statistics at:
http://homepage.ntlworld.com/roy.avis/WDLive/index.html
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FAIRFORD EGVA 281355Z 19008KT 9999 SCT035 11/08 A2962 RMK AO2A SLP032
T01050083 CHINO RWY09 $

Chino? What does that mean?

Jack