Transformation is carried using an ASCII file as it is generated by the web-page:
[num] [Text] Observations at [time]Z [Date]
-----------------------------------------------------------------------------
PRES HGHT TEMP DWPT RELH MIXR DRCT SKNT THTA THTE THTV
hPa m C C % g/kg deg knot K K K
-----------------------------------------------------------------------------
lines of data
Station information and sounding indices
Station identifier: [Value]
Station number: [Value]
Observation time: [date]/[time]
(...)
[num] [Text] Observations at [time]Z [Date]
(...)