El Nino Or La Nina 2025 Effects. El niño and la niña have weaker impacts during northern hemisphere summer than they do in winter. Summer impacts include warm conditions in northeastern australia and cooler than average conditions across.
La niña begins when pacific trade winds strengthen, pushing warm surface waters westward and allowing cooler water to rise in the eastern pacific. La niña is one phase of the climate pattern called the el niño southern oscillation (enso), which forms in the tropical pacific.
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