How do you decode the "cloud" group in a TTBB report?

I need to work with some radiosonde data, and one of the things that I need to decode is the "cloud group" 41414 in some TTBB reports. Strangely, I see that sometimes the report says "41414 80000", which seems to indicate "overcast, no clouds at low levels, no clouds at mid levels and no clouds at high levels". I did some checking, and this report isn't particularly rare. Does anyone know what such a code means?How do you decode the "cloud" group in a TTBB report?
Updated answer to make a correction



The 8000 code used in the upper air sounding indicates that the following data is a regional code. It does not have to follow the cloud group, but usually as the last group of the existing figure group in that report. It is used when a special code is needed to give information that is important for that area, but can not be communicated using any of the standard international code.



For more information, click on this link to download the WMO international code guide book. It is large pdf file, so it may take a little time to download. Then do a search for "8000" code and you will get the information.



http://www.wmo.int/pages/prog/www/WMOCod鈥?/a>



So in order to find out what this means, you will need to find out the local meaning the groups following this "8000" indicator group. Hope this helps.

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