Sydney area, eastern portion of the Central Tablelands region going eastwards from Bathurst, the lower Hunter Valley region, Albury in the South West Slopes in a few occasions, Cooma in the Monaro (New South Wales) to the south, Canberra in the ACT, Goulburn in the Southern Tablelands and the Snowy Mountains, with the latter regions having the most dramatic cool changes due to their southerly vicinity. Sydney receives an average of about five Southerly Busters a year, mostly in late spring and early summer, with the stronger ones generally reaching the city in the late afternoon or early evening on a hot day, though at times it would arrive after several days of hot weather. It is a crucial weather feature in the Sydney area, particularly for yachtsmen. In Victoria, most notably in Melbourne, southerly busters occur during the afternoons where the domineering heat, brought on by north-westerly winds from central Australia, suddenly gives way to a rapid drop in temperature, followed by rain, thunderstorms and a relatively cool night. They would reach as far inland as Swan Hill in the north and Omeo to the east, but would be less pronounced and intense as one moves more inland to the north. Temperature drops in these parts of Victoria are more dramatic than those in the east coast of New South Wales, where a drop can occur within half an hour (part of the easily changeable weather). Southerly busters most emerge in spring, as the landmass northbound of Melbourne starts to warm up. Meanwhile, though, the Southern Ocean, which provides cool breezes to Victoria from the west, does not warm up as swiftly as the mainland. As such, the temperature difference between hot air from the north and cold from the ocean would be very great, thus providing good conditions for the formation of thunderstorms. In South Australia, Mount Gambier would the most affected by southerly busters in the state due to its southeasterly location. The buster may also reach Adelaide and Whyalla in some occasions. In Western Australia, the Buster occasionally reaches Eucla due to its location near the Southern Ocean in the warm months, where it can experience dramatic temperature drops. In Wellington, New Zealand these storms are normally short and frequently have winds gusting between 120 km/h and 160 km/h though higher speeds are known. In South America, these southerly fronts frequently encroach on the southern coast