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Sydney-Hobart ocean currents

24 December, 2015

This year, there are two anticlockwise-rotating warm-core eddies and one clockwise-rotating cold-core eddy influencing the current speeds that the competitors in the Sydney-Hobart yacht race will encounter. The cold eddy is off Sydney-Jervis Bay and tending to block the southward flow of warm East Australian Current water. If it has moved little, or west since this 18 Dec image was acquired then yachts may encounter very little current during the first section of the race. South of Jervis Bay, however, the situation is probably very different, because of the detached warm-core eddy off southern NSW, where yachts are likely to find strong tail-current. The third player is the large, but possibly not very energetic, warm-core eddy spanning much of Bass Strait as well as much of the east coast of Tasmania. In between, or embedded within, these large systems are several smaller cold-core features which should also be watched. We wish all competitors a safe but challenging race. [more]