#Aust #TropicalCyclone #Outlook #CTCorp 2014–15 Australian Tropical Cyclone Outlook Average to below-average tropical cyclone activity is most likely for the Australian region this season Climate factors which influence the tropical cyclone outlook include: The tropical Pacific Ocean is currently in an El Niño-like state Climate models suggest a late season El Niño remains possible for 2014. The Australian tropical cyclone season: Runs from 1 November to 30 April Averages around eleven tropical cyclones Sees an average of four tropical cyclones cross the coast (though coastal impacts can be felt when tropical cyclones remain well offshore) Has always had at least one tropical cyclone cross the Australian coast each year. In El Niño years: Australia typically sees fewer tropical cyclones than usual with fewer land crossings The first tropical cyclone of the season to make landfall typically occurs in mid-January, later in the season than normal; in a neutral year the first coastal crossing usually occurs in late December. The statistical outlook indicates that regions can expect average to below-average tropical cyclone activity this coming season. The Australian region is likely to experience below average tropical cyclone activity during the 2014–15 season. The outlook indicates a 34% chance of having more tropical cyclones than average over the Australian region (meaning a 66% chance of having fewer tropical cyclones than normal). Past outlooks have shown that the Australian region outlook has a high level of accuracy. The western region experiences an average of seven tropical during the tropical cyclone season. The outlook indicates near-average tropical cyclone activity is most likely this season, with a 43% chance of an above average (57% chance of below average) number of cyclones. Typically between one and three tropical cyclones in the western region will have an impact upon the coast. In the past the accuracy for forecasts in the western region has been low. The northwestern sub-region, where tropical cyclones can impact coastal Western Australian communities, has a below average outlook for tropical cyclones this season (38% of above average, meaning a 62% chance of below average). Typically, five cyclones form or pass through this area each season. Around 40% of tropical cyclones in the northwestern sub-region impact on the coast at some stage in their life cycle. Forecast accuracy in this region is good. The northern region also has a near average outlook for this season. In an average year the northern region usually sees two or three named storms and one or two tropical lows that become cyclones after moving into the western or eastern regions. About three quarters of the tropical cyclones in the northern region impact the coast. Forecast accuracy in this region is low. The eastern region outlook indicates a near average tropical cyclone season is most likely (42% chance of above average, 58% chance of below average. About a quarter of tropical cyclones in the eastern region make landfall. Forecast accuracy in this region is low. Interpreting the outlook Percentages such as a 40% chance of having more tropical cyclones than average (60% chance of having fewer) mean that for every ten years with similar climate patters to those currently observed, four years would be expected to have an above-average number of tropical cyclones and six years would be expected to have a below-average number of tropical cyclones. On average, 11 tropical cyclones occur over the full Australian region, with four making landfall. Although there are often fewer tropical cyclones on average over the Australian region during El Niño years, there has never been an El Niño year without at least one tropical cyclone making landfall over the Australian coast. Issued by The Bureau of Meteorology To ensure you are viewing the latest information please visit: bom.gov.au/climate/ahead/tc.shtml
Posted on: Mon, 03 Nov 2014 23:01:56 +0000
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