Latest News

Australia's Weather Bureau Casts Doubt on La Nina Prospects

Australia's Weather Bureau Casts Doubt on La Nina Prospects

A senior climatologist at Australia's Weather Bureau isn't convinced that La Nina is forming, which could affect crop production and change rainfall patterns in parts of Asia, the Americas and Oceania.

La Nina and El Nino are both caused by a cooling or heating of the ocean surface temperature in the eastern and Central Pacific.

El Nino is the opposite. The former brings more rain to Australia's east, Southeast Asia, and India, with dryer weather in North America. Both can lead to flooding and hurricanes. Around this time of the year, models that forecast weather patterns tend to converge around a strong signal. However, there are currently many variations in these models.

She added, "This speaks to the fact there's still lots of uncertainty in the systems." The U.S. National Oceanic and Atmospheric Administration said that La Nina conditions are present, but in a weak form, and will likely persist until December.

Models from the Australian Bureau show sea surface temperatures dipping below a La Nina threshold in October, December and November by 0.8 degrees Celsius (1.44 Fahrenheit). Then they move back to neutral.

Gamble said that the cooling effect on cloud patterns and trade wind directions is not enough to give confidence in the existence of a La Nina.

The senior climatologist stated that "our model is probably among the weaker predictions for La Nina."

She said that although NOAA deemed the atmospheric response adequate, "We would like to see more."

Gamble said that, except for certain islands in the southwest Pacific region, there were no signs of typical La Nina rainfall patterns.

We aren't experiencing the same impact because we don't see a dominant La Nina pattern. She said that when you have a weaker sign, other influences can start to take over and possibly override the signal.

Between 2020 and 2023, three consecutive La Nina events brought record rainfall to Australia and droughts and heatwaves to parts of the Americas. Reporting by Peter Hobson

(source: Reuters)