After El NiƱo comes its antagonist: La NiƱa , a natural phenomenon that cools the Pacific Ocean and alters the global climate in a different way. According to NOAA, there is a 66% chance that this climate pattern will develop in the fall, primarily between September and November of 2024. This cooling could result in a drop of more than 0,5Ā°C in the surface temperature of the Pacific Ocean near the equator, which favors the formation of hurricanes in the Atlantic.
La NiƱa is a phenomenon that, unlike El NiƱo , is not necessarily as harmful as one might think, but its effects are just as significant. In the Pacific, a colder and drier winter is anticipated. This poses a serious problem for places like California , where rainfall has been scarce in recent years. On the other hand, increased hurricane activity is expected in the Atlantic, which could affect regions as far away as Spain . Furthermore, rainfall is forecast to be well above normal in Asia, Australia, and even southern Africa.
The La NiƱa prediction
It's important to note that La NiƱa predictions are not exact. However, it is known to occur every two to seven years. While it doesn't always follow El NiƱo , historical records indicate that the likelihood increases when El NiƱo has been particularly strong, as was the case in 2023. The changes in global climate caused by La NiƱa are significant, affecting many regions of the world.
The onset of La NiƱa can influence agricultural production, water availability, and the occurrence of natural disasters. For example, wetter conditions in regions like Southeast Asia can increase the risk of flooding, while severe droughts can occur in the southwestern United States and parts of South America . To better understand these droughts, one can review the consequences of the La NiƱa phenomenon in different areas.
The global and regional impact of La NiƱa
As we've mentioned, although La NiƱa originates in a specific area of āāthe ocean, its effects are global. This can impact various economic , social , and environmental areas . It's essential to be prepared for the changes that may arise.
Effects in South America
- Colombia and Ecuador: These countries often experience torrential rains during La NiƱa, which can cause flooding and landslides, severely affecting local communities.
- Argentina and Brazil: On the contrary, the rest of South America may see an increase in droughts y high temperatures, as occurred during previous episodes. For more information on the impact in these areas, see the explanation about La NiƱa.
Effects in the United States
- Southeast US: the conditions of La niƱa They often induce droughts, which can affect agricultural production and water availability in this region.
- Northwest U.S.: The presence of La NiƱa tends to generate an increase in rainfall, which could result in problems of floods in previously affected areas.
When is La NiƱa expected to impact?
According to predictions, La NiƱa is expected to begin developing between September and November 2024. However, the intensity of this phenomenon can vary. NOAA has indicated that there is a 74% probability that La NiƱa will persist through the Northern Hemisphere winter of 2024-2025.
Hurricane activity in the Atlantic tends to increase during La NiƱa periods due to reduced wind shear, which facilitates the formation of more intense storms. This year, it is estimated that we could see between four and seven hurricanes of Category 3 or higher. Predictions on this matter are crucial for preparing affected communities.
Climate change and La NiƱa
The interactions between La NiƱa and climate change are complex. While La NiƱa can contribute to temporary cooling , it is not enough to mitigate long-term global warming. The presence of greenhouse gases in the atmosphere will continue to be the determining factor in the rise of global temperatures. It is crucial that climate models and satellite observations continue to improve in order to anticipate the effects of La NiƱa and El NiƱo . This is related to the consequence of the cooling of the Atlantic.
Proper management of natural resources and effective planning to address extreme weather events are essential in a world where climate change is a growing threat. Science must continue to advance to better understand these phenomena and their implications for food security, water supply, and public health.
Although La NiƱa may seem like a localized phenomenon, its effects extend across the globe, impacting millions of people and ecosystems. Therefore, it is crucial that both governments and communities are prepared for and aware of what this phenomenon means for their environment.