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For the last 24 hours the Aurora Australis has been holding position near Fraser Island approximately 11nm from Casey station, 'stooging' back and forth in light winds and gentle seas, whilst Casey has been pummelled by winds gusting to 60kts (110kmh).
This illustrates the significant effect that Law Dome has on Casey weather. When strong winds blow across the top of the Dome a wave motion occurs in the atmosphere. This will often be reflected upwards and the energy dissipated however when there is an inversion near the Dome's peak the energy is reflected downwards and winds accelerate down the hill to Casey. This can be a very localised effect, as demonstrated by the relatively light winds at the ship.
Forecasters at Casey use numerical models as well as local knowledge and experience to forecast when this critical set of circumstances will occur, however, it's not straightforward as small differences in wind strength or the height of the inversion can significantly affect timing and extent of the high winds.
While Casey was being being buffeted, the team on board the ship used the opportunity to unload the Return To Australia (RTA) cargo and refill containers in preparation for tomorrow, thus reducing the number of lifts required. The wing areas of the tween deck and lower hold were also cleared in readiness for RTA cargo and the hanger has been emptied of cargo - all contributing to improved efficiency tomorrow.
Planning is now underway for tomorrow, for RTA cargo and for refuelling.
Expeditioners were also able to catch up on some much needed rest and recovery time.
Cheers,
Andy, Vic and Eloise
Map
A map showing Australia and Antarctica. The map shows the journey of one voyage that has occured in the season, with each route highlighted in a distinct colour.