Large, moving pressure systems — cyclones and anticyclones — are synoptic-scale (or Coriolis-scale) systems. They have dimensions of 500–3000 km, probably last for several days, and are characterised by mainly horizontal motion and geostrophic equilibrium. They are the major features shown on the mean sea level surface charts and the forecast charts published daily (or more frequently) by the Australian Bureau of Meteorology. The anticyclones were described in section...
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