Data from the US Climate Prediction Center shows that the “La Nada” phenomenon – the intermediate phase between El Nino (warmer) and La Nina (colder) – could soon give way to a weak La Nina. Scientists estimate the probability of this reaching about 56% by late December or early January 2025.
La Nina forms when sea surface temperatures in the tropical Pacific Ocean are lower than average. Current data indicate a slight cooling of the waters, increasing the likelihood of a La Nina. While it is forecast to be weak and likely to last only until spring, its presence could have a major impact on 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 snaps and heavier snowfall are expected in early 2025.
Despite its weak strength, this La Nina is unlikely to bring above-average snowfall, but highland and northern regions could still see significant snowfall.
Looking back at last winter, snow began to increase in January, bringing the 2023-2024 winter total to 130cm in Coeur d’Alene. With a weak La Nina, a similar scenario could play out again.
As the new year approaches, long-term weather models predict that cold northerly winds will begin to dominate the Inland Northwest, meaning that precipitation in the region will more easily turn to snow. After a slow start, the 2024-2025 winter season could pick up steam 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 around the world, including Vietnam.
When La Nina occurs, changes in sea surface temperatures in the Pacific Ocean often alter atmospheric circulation, causing far-reaching effects on the global climate. For Vietnam, La Nina brings a typical winter with lower than normal temperatures and increased rainfall.
La Nina forms when sea surface temperatures in the central and eastern Pacific Ocean drop below average. This causes cold air from Siberia and mainland Asia to intensify southward. As a result, cold air waves flow into Vietnam more frequently and strongly, 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 occurring.
