Setup
Navigate into the 3_bufr folder within Metview.
Examine the BUFR file
Right-click and examine the supplied BUFR file obs.bufr, bringing up the BUFR Examiner tool.
Have a look around to see what's in the file, then find the key airTemperatureAt2M in the Data Tree tab. Right-click and Copy item to get this key name into the clipboard.
Filtering the BUFR file
We will now extract the 2m temperature values from the file. Create a new Observation Filter icon and edit it.