ENTO (Sandefjord Lufthavn Torp - Oslo)
Thanks Floppy Link - ENTO IS the same airfield. It's about 10km east from the town of Sandefjord hence the name. It's about 100km south of Oslo but Ryanair refer to it as Oslo Torp. To be fair to them, the coach journey from the airport (£23 return) is very comfortable and efficient, taking only about 1:20hrs.
Anyway, I'm still quite surprised at this event. The airfield operating surfaces where clear and dry when I left at 09:25 on Sunday morning, with clear skies, just starting to cloud over. The airfield is probably some old military field, with a single runway and no parallel taxyway and a quite small apron. The terminal looks less than 5 years old. I saw snow clearing and fire equipment as we taxyied out but I guess they were losing a battle against fast falling snow.