Normal: Normal strength trade winds, Warm water piles up in West, Upwelling of cold water in the East, Low atmospheric pressure over West, High atmospheric pressure over East, Walker cell reinforces trade wind, Warm moist weather in West, Cool dry weather in East, Thermocline higher in East than West, El Nino: Weaker trade winds or reversed, Warm water piles up in centre of Pacific, Weak or no upwelling in East, Low atmospheric pressure over central Pacific, High atmospheric pressure in West, Walker circulation pushes against trade winds weakening them further, Warm moist weather in central Pacific, Cool dry weather in West, warmer & wetter than normal weather in East, Thermocline is almost flat, La Nina: Stronger trade winds, STRONG piling up of warm water in West, STRONG upwelling of cold water in East, STRONG high atmospheric pressure in East, STRONG low atmospheric pressure in West, STRONG Walker cell reinforces strong trade wind, VERY warm wet weather in West, VERY cool dry weather in East, Thermocline is much higher in the East than West,

ENSO cycle

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