The 8/xxx is synoptic cloud types.
From the Federal Meteorological Handbook .
Cloud Types (8/ClCmCh). At designated stations, the group 8/ClCmCh shall be reported and coded in 3-and 6-hourly reports when clouds are observed. The predominant low cloud (Cl), middle cloud (Cm) and high cloud (Ch), shall be identified in accordance with WMO International Cloud Atlas Volumes I and II, or the WMO Abridged International Cloud Atlas or agency observing aids for cloud classification.
A 0 shall be coded for low, middle or high cloud type if cloud if present in that classification.
A solidus "/" shall be coded for layers above an overcast. If no clouds are observed due to clear skies, the cloud type group shall not be coded. For example, a report of "8/6//" would indicate an overcast layer of stratus clouds; a report of "8/903" would indicate cumolonimbus type low clouds, no middle clouds, and dense cirrus high clouds
Last edited by Techman; 17th Nov 2003 at 06:42.