Data from the US Climate Prediction Center shows that the "La Nada" phenomenon - the intermediate phase between El Nino (vatter pressure) and La Nina (cooler) - could soon give way to a weak La Nina. Scientists estimate the likelihood of this occurring at around 56% by late December or early January 2025.
La Nina forms when sea surface temperatures in the tropical Pacific Ocean drop below average. Currently, the data has pointed to a slightly cool water area, increasing the likelihood of La Nina appearing. Although it is forecast to be weak and may only last until spring, its presence could greatly affect winter weather.
La Nina typically brings a colder, wetter winter to the northern United States, including the Inland Northwest. If a weak La Nina is declared, stronger cold fronts and heavier snowfall are expected in early 2025.
However, with its weak intensity, this La Nina is unlikely to bring above-average snowfall. However, high mountainous and northern areas may still see significant snowfall.
Looking back at last winter, snow started to increase in January, causing the total snowfall for the 2023-2024 winter to reach 130cm in Coeur d'Alene. For a weak La Nina, a similar scenario could be repeated.
As the new year approaches, a long-term weather pattern predicts that cold air flows from the north will begin to dominate the Inland Northwest. This means that the rainfall in the area will more easily turn to snow. After a slow start, the 2024-2025 winter could "accelerate" in the coming weeks.
The La Nina phenomenon not only affects countries in the Pacific region but also has a clear impact on the weather in the world, including Vietnam.
When La Nina appears, changes in sea surface temperatures in the Pacific Ocean often change atmospheric circulation, causing far-reaching impacts on the global climate. For Vietnam, La Nina brings a typical winter with lower than normal temperatures and increased rainfall.
La Nina forms when the sea surface temperature in the central and eastern Pacific drops below average. This caused cold air from Siberia and mainland Asia to strengthen to the south. As a result, cold air waves flooded into Vietnam more strongly and more frequently, causing temperatures to drop significantly, especially in the Northern region.
During La Nina years, winter in Vietnam often lasts longer with more severe cold spells.
