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Thursday, December 9, 2021

La Nina. Winter weather. 90 percent chance he’ll rule the weather

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Scientists from the US Climate Forecasting Center (CPC) have released the latest forecast for a phenomenon called La Nina. It shows that the probability of its influence on the weather during northern winter in the northern hemisphere is 90 percent.

Scientists at the Climate Prediction Center, part of the US National Weather Service (NWS), released an update to its forecast for the La Nina phenomenon on Thursday. They predict that the probability of its persistence in the northern hemisphere during winter (until February 2022) is 90 percent. When it comes to spring 2022, the period March-May, the probability of the weather being affected is about 50 percent.

La Nina. Impact on the weather

La Nina has grown stronger over the past month, reported. Sea surface temperature in the Pacific equatorial zone was below the long-term average. It is also expected to have an impact on the temperature and rainfall in the United States in the coming months.

Water surface temperature anomalies in the Pacific Ocean on November 3, 2021CPC

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What is La Nina?

The La Nina phenomenon occurs when the temperature of the Pacific Ocean’s surface near the equator, especially off the coast of South America, is below average. This is due to the increased activity of trade winds – permanent winds – in this part of the world. They bring cool deep water to the ocean’s surface.

The relationship between the ocean and the atmosphere affects the position of the jet stream. jet stream), thus influencing the global weather. La Nina increases the flow of cold air from Canada to the United States, which cools the winters in the region. It also contributes to the occurrence of stronger monsoon rainfall in India.

La Nina can also affect the weather in Europe, but due to the great distance from the Pacific Ocean, these relationships are the most difficult to predict. This is the opposite of El Niño, where the Pacific is warmer and the trade winds fade away.

Further CPC predictions on how La Nina will affect the weather are expected in early December.

Main photo source: NYC Russ / Shutterstock

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