Southeast Australian foehn

rdf:langString Southeast Australian foehn

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rdf:langString Meanwhile, dry and mostly sunny conditions occur on the coastal plain due to compression of cold air as it descends the Ranges' leeward side. Relative humidity no greater than 50%.

rdf:langString Overcast, oftentimes foggy and/or snowy conditions resulting from uplift on the western slopes. Relative humidity largely in excess of 80% throughout the day.

rdf:langString Snow covered farmland.jpg

rdf:langString Sunny Sydney Skyline.jpg

rdf:langString The southeast Australian foehn is a westerly foehn wind and a rain shadow effect that usually occurs on the coastal plain of southern New South Wales, and as well as in eastern Victoria and eastern Tasmania, on the leeward side of the Great Dividing Range. Ranging from cool to hot (depending on the season), the effect occurs when westerly winds descend steeply from the Great Dividing Range onto the coastal slopes, whereby causing major adiabatic compression (which is the rate at which temperature decreases with altitude) and a substantial loss of moisture. The effect is known by other names such as the Australian foehn, the Australian chinook, the Great Dividing wind, the Great Dividing foehn or simply westerly foehn. The southeast Australian foehn is distinguished by three criteria; surface winds which blow from the mountains' direction, a sharp rise in air temperature in the leeward side of the mountains, and an accompanying diminution in atmospheric moisture. Typically occurring from late autumn to spring, though not completely unheard of in the summer (particularly in eastern Tasmania), the Great Dividing foehn mainly occurs when a westerly or southwesterly frontal system (including a general westerly flow) passes over the ranges, thereby providing clear to partly cloudy and relatively warmer conditions on the lee.

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