The India Meteorological Department (IMD) issued a warning on Monday, stating that a severe winter season is expected this year and that the La Nina phenomena will begin in September. La Nina, which usually occurs around the conclusion of the monsoon season, is noted for bringing with it a sudden decrease in temperature and frequently more rainfall, which raises the chance of an exceptionally harsh winter.

La Nina, which translates to "the girl" in Spanish, is the climatic counterpart of El Niño, and their respective behaviours are radically different. Strong easterly winds cause ocean waters to move westward during a La Nina episode, which cools the ocean's surface, especially in the equatorial Pacific.

The warming conditions brought about by El Nino, sometimes known as "the little boy," occur when the trade winds diminish and warmer seas move back eastward towards the western coast of the Americas. This cooling effect contrasts with this warming impact.

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Significant oceanic and atmospheric phenomena, La Nina and El Nino, usually start between April and June and intensify between October and February. These episodes often last nine to twelve months, although they can also infrequently extend up to two years.

Cooler water from the ocean depths can rise and preserve a climatic balance when trade winds blow west along the equator, pushing warm water from South America towards Asia.

But when La Nina strikes, this equilibrium is upset, which has a domino effect on the climate worldwide.

La Nina has the opposite impact of El Nino, causing the ocean surface and the atmosphere above it to cool. El Nino is linked to warmer air and ocean temperatures in the Pacific, which leads to overall warmer world temperatures.