After almost a decade away, La Niña climate system is again…

After nearly a decade away, La Niña weather system is back…

From UN news

UNDP / Joe Hitchcock The low-lying island-Pacific nation of Tuvalu is particularly vulnerable to sea-level rise caused by climate change. October 29, 2020 climate change

Many will be familiar with El Niño – the ocean warming phenomenon that affects global weather patterns – but what about La Niña, which is related to cooler sea temperatures?

According to the World Meteorological Organization (WMO), La Niña is back in the central and eastern equatorial Pacific after an absence of almost ten years.

This is expected to result in sea surface temperatures between two and three degrees Celsius, which is above average, said Dr. Maxx Dilley, deputy director for the climate services department at WMO.

“This cooling of these large marine areas has a significant impact on the circulation of the atmosphere that flows over them. And the changes in the atmosphere, in turn, affect precipitation patterns around the world. "

Uneven effects

The likely results of La Niña vary around the world, but there is evidence that rainfall will be below average in the Horn of Africa, as in Central Asia.

Elsewhere, the WMO weather models forecast above-average rainfall for Southeast Asia, some Pacific islands and the northern region of South America.

The UN agency also warned that East Africa is likely to experience drier than usual conditions, which, combined with the existing impact of the desert locust invasion, may create regional food insecurity.

According to WMO, there is a 90 percent chance that tropical Pacific surface temperatures will stay at La Niña levels for the remainder of the year, and a 55 percent chance that it will stay that way through March next year.

This is important as La Niña contributes to temperatures, rainfall, and storm patterns in many parts of the world.

Read the full article here.

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