* Chance of La Nina has increased in recent weeks
* La Nina has potential to impact global grains market -analysts
* Strongest El Nino in 20 years is now easing (Adds quotes from Weather bureau and analyst on impact on global grain market)
By Colin Packham
SYDNEY, April 12 (Reuters) - The chance of a La Nina in 2016 has increased in recent weeks, with climate models indicating a 50 percent possibility of the weather event emerging this year, the Australian Bureau of Meteorology (BOM) said on Tuesday.
The potential emergence of a La Nina comes as the strongest El Nino in nearly 20 years - which has been linked to serious crop damage, forest fires and flash floods - begins to subside.
La Nina is the opposite of the El Nino weather event that is characterized by warmer waters in the tropical Pacific. While a La Nina can be less damaging than El Nino, severe La Ninas are also linked to floods, droughts and hurricanes. changes in the tropical Pacific Ocean and atmosphere, combined with current climate model outlooks, suggest the likelihood of La Nina in 2016 has increased to around 50 percent," the BOM said.
The bureau had previously indicated that a strong El Nino weather pattern would likely end in the second quarter of 2016 and a La Nina could follow. say a La Nina could impact the supply of global grains, particularly wheat and corn - where the United States is the largest exporter of both crops. The weather event is associated with lower-than-average rainfalls over North America.
While global supplies are ample as of now, the only thing that could change that "would be a possible La Nina", said Phin Ziebell, agribusiness economist, National Australia Bank.
Benchmark wheat prices Wv1 fell to a more than five-year low last month and corn prices Cv1 hit a 9-1/2-month low amid large world supplies. GRA/