El Nino & La Nina

We hear news and we also hear weather forecasts…
It goes something like this 
Cloudy-
Max Temperature-
Min Temperature-
Sunrise-
Sunset-
Well that’s pretty much the standard… 
I first read about El Nino & La Nina way back in my school and sometime back I came across the two terms again.
So…What is this El NiNo? What is La Nina?
How will it affect the weather? 
El Nino and La Nina are weather patterns that result from variations in ocean temperatures in the Equatorial Pacific.
El Niño, which is essentially an abnormal warming of the tropical Pacific Ocean. This leads to abnormal or altered weather patterns around the globe. It is a naturally occurring phenomenon which appears every 2- 7 years and some of the impacts typical of El Niño events:
#Dry conditions over Australia, Indonesia and India.
#Increased precipitation over regions of South America and the Eastern Pacific and this leads to flooding and landslides.
#Weaker than normal Indian Monsoon causes drought which can vastly reduce crop yields.
La Niña episodes represent periods of below-average sea surface temperatures across the east-central Equatorial Pacific. Some La Niña impacts are:
#Wetter than normal conditions west of the equatorial central Pacific over northern Australia and Indonesia during the northern hemisphere winter, and over the Philippines during the northern hemisphere summer. 
#Wetter than normal conditions over southeastern Africa and northern Brazil, during the northern hemisphere winter season. During the northern hemisphere summer season, the Indian monsoon rainfall tends to be greater than normal.
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