El Nino and La Nina : By: Sanjay Thapa El Nino and La Nina What is El Nino? : El Nino is a shift in the ocean currents, temperatures(water becomes warmer), and atmospheric condition is the tropical Pacific Ocean.
The signs of an El Nino are:
Rise in surface pressure over the Indian Oceans, Indonesia and Australia.
All in air pressure over Tahiti and the rest of central and eastern Pacific Ocean.
Warm water spreads from the west Pacific and the Indian Ocean to the east Pacific. It takes the rain with it, causing extensive drought in the western Pacific and rainfall in the normally dry eastern Pacific. What is El Nino? Effects of El Nino : Effects of El Nino In Canada, both warmer and drier winters (due to forcing of the Polar Jet further north) occur, although relatively little variation is seen in the Maritime Provinces. The following summer is less stormy and warmer over the middle of the country. It is believed that the ice-storm in January 1998, which devastated parts of Southern Ontario and Southern Quebec, may have been caused or at least accentuated by El Niño's warming effects. El Niño also warmed up weather in Vancouver for the 2010 Winter Olympics, such that the area experienced subtropical-like weather during the games. Other El Nino Events : Philippines, that normally get heavy rains experienced a severe drought.
Peru, the normally dry regions in South America sprang to life with wildflowers after heavy rainfall.
Also at the same time, torrential rains fell in the normally dry regions of Somalia and Kenya in east Africa.
The winter of 1997/1998 for eastern North America as much milder and on the west coast was much wetter than average.
In 1997, Atlantic hurricane Season was much less active then average. Other El Nino Events La Nina : La Nina is a shift colder than average ocean temperature in the eastern Pacific. La Nina is right opposite to El Nino and causes opposite effects of El Nino. During this shift, the surface water temperature off the coast of Peru drops. Thus Indonesia and northern Australia receive higher than normal precipitation.
Some other effects of La Nina are:
Less number of Hurricanes in Northern Hemisphere.
Indonesia and northern Australia receive higher than normal Precipitation (rain, snow, hail etc.)
In Canada La Nina generally causes a cooler and snowier winter. La Nina