In a media release this week the Australian Bureau of Meteorology confirmed that our situation in the El Niño Southern Oscillation shows we have now moved fully into an El Niño climate event for the rest of this year 2015.
That typically means that the rainfall will decrease and the average temperatures will rise all over Australia for the rest of 2015 and possibly onwards into 2016. i.e. It means less rainfall for us so we need to get planning now for a persistent long hot dry summer and lots of bushfires etc.
There are a lot of plants that will possibly thrive in this warmer and drier period but generally it means we need to get our vegetable gardens ready for a long harsh summer.
“The onset of El Niño in Australia in 2015 is a little earlier than usual. Typically El Niño events commence between June and November,” Mr Plummer said.
“Prolonged El Niño-like conditions have meant that some areas are more vulnerable to the impact of warmer temperatures and drier conditions.
“The failed northern wet season in 2012–13, compounded by poor wet seasons in 2013-14 and 2014-15, have contributed to drought in parts of inland Queensland and northern New South Wales,” he said.
Mr Plummer noted that while the El Niño is forecast to strengthen during winter, the strength of an
El Niño does not necessarily correspond with its impact on Australian rainfall. Australia experienced widespread drought during a weak El Niño in 2006–07, while stronger events such as the El Niño event in 1997–98 had only a modest impact on Australian rainfall.
“Recent significant rainfall and flooding along the east coast of Australia, associated with two almost back-to-back East Coast Lows, did not penetrate far into inland regions and therefore have done little to alleviate conditions in drought affected areas,” Mr Plummer said.
While El Niño increases the risk of drought, it does not guarantee it; of the 26 El Niño events since 1900, 17 have resulted in widespread drought.
Despite El Niño increasing the likelihood of drier conditions later this year, the Bureau’s May to July Climate Outlook (see link below) indicates much of Australia is likely to be wetter than average.
This is being driven by warmer than average Indian Ocean sea surface temperatures, which are dominating this outlook.