Australian meteorologists call an end to La Nina

May 25, 2011
A graphic showing the global rainfall anomaly in December 2010 attributed to the La Nina weather system. Australian meteorologists on Wednesday declared La Nina, the disruptive weather pattern behind floods and cyclones that brought death and destruction this year, to have ended.

Australian meteorologists on Wednesday declared La Nina, the disruptive weather pattern behind floods and cyclones that brought death and destruction this year, to have ended.

The , which began in earnest in December, was blamed for torrential rain and ferocious storms in Queensland state that wiped out crops, flooded mining operations and claimed at least 30 lives.

It also brought severe weather to Southeast Asia and South America over late 2010 and early 2011.

Dr Andrew Watkins, head of the Australian Bureau of Meteorology's Services, said rapid changes in Pacific climate patterns over the past few weeks have finally brought the event to a close.

"This most recent La Nina will go down in the record books as one of the strongest in living memory," he said.

"It's been nearly 40 years (1975-76) since Australians have witnessed a La Nina event of this intensity."

La Nina is characterised by unusually cool in the central and eastern tropical Pacific.

It leads to increased rainfall across the western equatorial Pacific, northern South America and southern Africa over December to February.

At the same time, drier than normal conditions are observed along coastal Ecuador, northwestern Peru and equatorial eastern Africa.

"The outlook for () winter is for conditions to stay neutral," Watkins said.

"Over the coming months changes in the Pacific Ocean will give a clearer picture of the likely conditions for the coming spring and summer, but at this stage it's a waiting game."

El Nino is the opposite condition of La Nina. It is characterised by unusually warm ocean temperatures in the central and eastern equatorial Pacific.

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