The header of the text files contains:

serial number of the sonde
text code for location of the launch
sonde type
date
balloon release time (UTC)
latitude
longitude
burst altitude
ground validation data
	pressure  
	temperature  
	relative humidity 
	wind direction  
	wind speed  

Column data:

seconds since balloon release
pressure (hPa)
temperature (K)
relative humidity (%)
east-west wind component (m/s)
north-south wind component (m/s)
rise rate (m/s)  
height above ground (m)
latitude
longitude
wind direction
wind speed (m/s)