That is just a great TAF for a training exercise or a test, I am suspecting that some ATO in Adelaide has spent a few minutes preparing the forecast for that very reason
My interpretation is the concensus is correct in that 30 minutes Holding is all that is required as determined by the INTER. If the Met office expected the conditions to be sequential, they would have forecast TEMPO.
Clearly the second INTER conditions are the more critical for cat A & B aircraft as it requires 30 Holding or an alternate. The first inter period only applies an operational requirement to Cat D aircraft.
Other options you may consider is the YPAD TAF and does it have the requirements also, (ie - can you use it as an alternate? if it has no requirements it may alliviate the need for holding fuel if you are weight critical) and, what sort of aircraft are you in and is the cross wind component exceeded at any time with the wind changes therfore requiring an alternate as well.
Great post for newbies to consider!
