Ceilometer (Vaisala CT-25K) data (*.txt) format

Data format is comma delimitted. Each term shows;

YYYY,MMDD,HHMMSS,S,W,aaaaa,bbbbb,ccccc,ddddd,eeeee

where
YYYY:    year
MMDD:    month and date
HHMMSS:  time stamp in UTC
S:       observation status 
           0 - no significant backscatter
           1 - one cloud base detected
           2 - two cloud bases detected
           3 - three cloud bases detected
           4 - full obscuration determined but no cloud base detected
           5 - some obscuration detected but determined to be transparent
W:       instrument status 
           0 - self-check OK
           W - at least one warning active, no alarms
           A - at least one alarm active
aaaaa:   lowest cloud height     (for S = 1,2,3)
bbbbb:   2nd lowest cloud height (for S = 2,3)
ccccc:   3rd lowest cloud height (for S = 3)
ddddd:   vertical visibility     (for S = 4)
eeeee:   highest signal detected (for S = 4)

when ddddd and eeeee are filled with some values,
aaaaa/bbbbb/ccccc should be null. 


Eample.

2000,1120,001918,1,0,01870,,,,