“La Niña” weather phenomenon could reappear in late 2021 in the Pacific | Technology

La Niña could reappear before the end of 2021, just five months after the World Meteorological Organization (WMO) declared the phenomenon over, due to a forecast of temperatures above the average despite the cooling effect that its recent passage produced.

WMO estimates that there is a 40% chance that La Niña – which corresponds to the large-scale cooling of surface waters in the central and eastern equatorial Pacific – will reappear after its presence from August 2020 to May this year.

“But despite the La Niña phenomenon, which usually has the effect of cooling the climate, the temperatures measured on land should be higher than the average between September and November, especially in the northern hemisphere,” the organization stresses.

The impact of La Niña, which occurs every two to seven years, is felt over a large part of the planet in the form of variations in atmospheric pressure, winds and rainfall, with effects generally inverse to that of another phenomenon, El Kid.

But climate change caused by human activities influences these phenomena.

“Climate change of anthropic origin amplifies the effects of natural phenomena such as La Niña and increasingly influences our weather conditions, which translates especially to more intense heat and drought (and the associated risk of forest fires), as well as record rainfall and floods, ”said WMO Secretary General Petteri Taalas.

“We have been tragically witnesses in recent months in almost every region of the world. Climate change increases the severity and frequency of disasters, ”he stressed, referring both to the gigantic fires that affected the western United States and Siberia and to Hurricane Ida that swept through the southern United States before leaving underwater to New York and its neighboring states in the wake of very heavy rainfall.

The WMO said that if the Girl reappears, it is expected that is weak, and above-average sea surface temperatures should influence air temperatures for the period September to November 2021.

According to the organization, temperatures would be above average in east-central North America, the extreme north of Asia and the Arctic, as well as in central and eastern Africa and southern South America.

There is a greater chance of below-normal rainfall in many areas of southern South America.

Much of the Mediterranean to the Arabian Peninsula and Central Asia, and southern central and eastern Africa would also experience below normal rainfall.


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