Decoding Radiosonde Code

Radiosonde observations are usually separated into several sections. The 3 most widely used sections are:

Click one of the above links for information about decoding those observations.


TTAA's - Observations of thermodynamic data at the mandatory levels - levels that must be included in the sounding.

Example of TTAA section of sounding:

Decoding the TTAA section

If the TTAA example is reformated with one level per line:

[top]


TTBB's - Observations of thermodynamic data at the significant levels - levels where the vertical change of either temperature of moisture exceed critical values.

Example of TTBB section of sounding:

Decoding the TTBB section

If the TTBB example is reformated with one level per line:

[top]


PPBB's - Observations of wind data at standard levels.

Example of PPBB section of sounding:

Decoding the PPBB section

[top]