The Great Southern Route : 2008 - 2009
WEATHER ROUTING 020 | GSR described influences this movement. The ridge of high pressure across the southeastern Indian Ocean is a semi-permanent feature across this area. From November through March, this ridge is found along 32S to 35S and from approximately 50E eastward to 105E. This ridge shifts farther north in June through October along approximately 29S to 32S. At times, portions of this ridge will "break away" and move eastward across Australia during June through August or further south across the Great Australian Bight from December through February. Winds across the southeastern Indian Ocean from 10S to 20S are generally east to southeast of Beaufort Force 3-5 and swells 5-8ft during the summer months (December through February). However, these winds increase during the winter months (June through August) out of the east and southeast of Beaufort Force 4-6 and swells 6-10ft. The reason for the higher conditions in the winter is due to the ridge of high pressure situated farther north this time of year and interacting with the equatorial trough. Closer to the equatorial trough (between 5S and 10S), winds are generally out of the east approximately 1-2 Beaufort Force lower, with swells 2-3ft lower. Outside of any squalls, trade winds and swells are similar across the Java and Banda Seas as described near the equatorial trough across the southeastern Indian Ocean. Winds generally funnel from Torres Strait through the Gulf of Carpentaria and Arafura Sea especially during the winter months. During the summer months, winds are out of the east to southeast Beaufort Force 4-5 (though force 6 to, at times, 7 are more "The monsoonal winds are the weather event that defines the seasons across the Northern Indian Ocean."
2010 - 2011