Saturday, October 6th 2012, 6:40 PM EDT
In these hours, a furious storm of wind, with gusts in excess of the intensity of a hurricane, they are whipping the eastern section of the southern Indian Ocean, in South-South/West the coast of Australia.
The passage of a deep vortex depressionario-hurricane, with minimum baric ground dropped below 936 hpa, before the Antarctic coast, is tightening considerably the "horizontal pressure gradient", activating powerful storms in the open ocean. The deep sub-polar cyclone, gradually evolving towards est-sud/est, will be close to the Antarctic coast bathed by the sea, Davis, with a minimum baric ready to slip on 930 hpa, which will contrast with the high values baric specific heat dall'anticiclone permanent, located within the Antarctic Plateau, with maximum baric of well over 1025-1030 hpa.
The swift passage of this deep depression-hurricane, before the Antarctic coast, will cause a strong "horizontal pressure gradient" that will be located between the coast of Ingrid and the coast of the Queen Mary. Just in this part of the coast of Antarctica, the remarkable gap baric triggered by deep cyclone, activate strong winds, sometimes even violent, easterly, between E and NE-E-SE, which will sweep the entire area, with gusts will exceed the threshold of 160-170 km / h (locally even more).
But the strongest storms will locate southern Indian Ocean, where the meeting between the narrow and low pressure isobars of the larger ones belonging all'anticiclone of the Indian sub-tropical South (also known as anticyclone of the Mascarene Islands), which extends along the meridians, with maximum baric over 1025 hpa in the open ocean, in the section east of the island of Madagascar, will produce a dense "pressure gradient" that succeed in ushering in strong westerly winds, which will take the character of real hurricane .
The extended "Fetch", ie the space of sea where the wind blows, will produce gigantic waves that propagate to the stretch of ocean south of the coast of Western Australia, with "Run-Up" that will exceed 9-10 meters, while in the most violent storms can be developed very high waves, even more than 10-11 meters, which will make really prohibitive shipping. From tomorrow the deepest extratropical cyclone will continue to move eastward, encouraging a shift towards the Indian Ocean storms over eastern Europe. During the evolution of the low pressure area to the east gradually begin to brim, with a consequent reduction of the storms at sea and along the Antarctic coast, while the wave propagates eastward, with large waves that will keep "Run-Up" than 7-8 meters off the coast of southern Australia.