Never trust ADL in winter !
Personal experience - Ansett days; CBR to ADL with a CAVOK TAFOR / TTF-M on ADL.
Preparing for briefing prior to TOPD and got the ADL atis which indicated fog moving in from the NE. Had not received any hazard alert from ATC.
Mildura and MEL had fog and too far into the flight to return to CBR so the decision was made to continue to ADL and try to beat the fog (with the option of an autoland if need be).
VOR/D 05 no good so took a 5kt downwind ILS 23 and got visual at 600'. The fog continued to thicken after our arrival.
From what I have observed at ADL, the fog forms up the Barossa Valley , not so much over the airport itself, then slides down the valley with a katabatic breeze which also takes out Edingurgh.
The ADL forcast might not have fog but it is frequently not too far away.
Role on....