GWTF
Its not an acronym - just an abbreviation to make Morse transmission easier.
Kermie
Nearly right - The 'Q' code is not, in itself interrogative. To make it into a question rather than a statement it is suffixed by IMI, those three letters being sent as one continuous character (in Morse 'speak', IMI barred)
Without the IMI. it is just a statement i.e. 'the Altimeter setting which will indicate airfield height above sea level' much simpler as QNH
