What is the La Nina Effect?

i got curious when i read a newspaper article on the El Nino and La Nina effect. I understood the El Nino effect but i am confused with the other one.

A La Niña effect may be defined as a drop in average sea-surface temperatures to more than 0.4 degrees C (0.7 degrees F) below normal, lasting at least six months, across a specified part of the eastern tropical Pacific (5 N- 5 S latitude, 120-170 W longitude).

When La Niña forms, the hurricane season is affected as the cooling water creates dramatic changes in the upper-level air currents that play a major role in storm development.

Though El Niño caused worldwide weather problems, it also snuffed out hurricanes. Winds 35,000 to 45,000 feet in the atmosphere shifted to come from the west, basically shearing the tops from developing storms.

During La Niña, high-level westerly winds either weaken or shift to come from the east, allowing more storms to develop, said Jerry Jarrel, director of the National Hurricane Center in Miami.

The 1995 and 1996 hurricane seasons, sandwiching the last La Niña, were the most active back-to-back seasons on record, combining for 20 hurricanes, said Christopher Landsea with the Hurricane Research Division of the National Oceanographic and Atmospheric Administration.

In 1957, 1965 and 1991, El Niños disappeared rapidly without La Niñas forming. However, in 1969, 1972 and 1987, La Niñas were in place by July.

Even if it is too late to affect a hurricane season, La Niña can have a profound impact on fall and winter weather in Florida and the United States. During one, Florida can expect winter - already a dry season - to be warmer and drier.

``It will be drier with fewer cold fronts and more sunshine,'' Landsea said. ``Four or five months with no rain could have a dramatic effect on the potential for fires.''

Some cold fronts still could wander into the state even if temperatures are warmer on average, as expected, Kousky said. ``There will be a lot more variability this winter. Chances are you will experience some colder periods than you had last year.''

The northern part of the country can expect a colder winter, he added, while the Midwest can expect less rain or snow. Droughts struck that region in 1988-89 and 1995-96 following La Niñas.

``It accentuates the normal pattern,'' Kousky said. ``Areas that are cold will be colder. Areas that are warm will be warmer.''

La Niña conditions may persist for as long as two years.

la niña is a season of dryness
El Niño-Southern Oscillation (ENSO) is a global coupled ocean-atmosphere phenomenon. The Pacific ocean signatures, El Niño and La Niña (also written in English as El Nino and La Nina) are major temperature fluctuations in surface waters of the tropical Eastern Pacific Ocean.
The La Nina Effect is the opposite of the El Nino effect

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