World Video | Defence | Foreign Affairs | Natural Events | Trade | NZ in World News | NZ National News Video | NZ Regional News | Search

 


La Niña Weather Likely To Last For Months

La Niña Weather, With Possible Floods And Droughts, Likely To Last For Months – UN

New York, Oct 11 2010 5:10PM

The La Niña weather pattern is likely to continue and may strengthen over the next four to six months, potentially bringing abnormal conditions to widely separate areas of the world, from floods to droughts to below or above normal temperatures, the United Nations weather agency "http://www.wmo.int/pages/mediacentre/press_releases/pr_900_en.html"reported today.

La Niña, characterized by unusually cool ocean temperatures in the central and eastern tropical Pacific, is the opposite of El Niño, characterized by unusually warm ocean temperatures, and both events can last for 12 months or more, disrupting normal tropical rainfall atmospheric circulation, with widespread impacts on climate in many parts of the world.

But although the current La Niña has similarities to past events, its local impacts may differ from those observed in the past, the World Meteorological Organization ("http://www.wmo.int/pages/index_en.html"WMO) warned in its latest update, stressing that for managing climate-related risks, it is important to consider both prevailing La Niña conditions and other factors with potential influence on the local climate.

Generally with La Niña, rainfall increases across the western equatorial Pacific, Indonesia and the Philippines and is nearly absent across the eastern equatorial Pacific. Wetter-than-normal conditions tend to prevail during December-February over northern South America and southern Africa, and during June-August over south-eastern Australia.

Drier-than-normal conditions are generally observed along coastal Ecuador, north-western Peru and equatorial eastern Africa during December-February, and over southern Brazil and central Argentina during June-August.

La Niña also contributes to large-scale temperature anomalies worldwide, with most affected regions experiencing abnormally cool conditions. Below-normal temperatures occur during December-February in south-eastern Africa, Japan, southern Alaska, west and central Canada, and south-eastern Brazil, and during June-August in India, south-eastern Asia, the west coast of South America, the Gulf of Guinea, northern South America and portions of Central America.

Warmer-than-normal conditions occur during December-February along the Gulf coast of the United States.

“Almost all forecast models predict continuation and possible further strengthening of this La Niña episode for the next 4 to 6 months, taking the event well into the first quarter of 2011,” WMO said.

This is because of the strong interaction between the oceanic and atmospheric aspects of the current event and the large area of below-average subsurface temperatures.

The current La Niña developed quickly in June and July 2010, following the dissipation of the 2009/2010 El Niño in April. Since August, the event has been moderate to strong.

ENDS

© Scoop Media

 
 
 
 
 
World Headlines

 

UN Health Agency Responds To Ebola Spike

UN health agency responds to Ebola spike by deploying team on border of Guinea and Guinea-Bissau More>>

UN Casts Israel As World's Worst Violator Of Health Rights

Israel's army team of medics recently treated 1,600 victims of the Nepal earthquake. More>>

W Thousands Flee Syria’s Besieged Historic City Of Palmyra

As thousands flee Syria’s besieged historic city of Palmyra, UN refugee agency readies response plan More>>

UN Agency To Halt Housing Allowance For Palestine Refugees

Lack of funds forces UNRWA to suspend cash assistance for housing for Palestinian refugees from Syria in Lebanon. Photo: UNRWA/Shafiq Fahed More>>


Bangkok: International Day Against Homophobia, Transphobia, Biphophia

BMA, UN, embassy representatives, civil society and artists stand united with LGBTI Thais on International Day against Transphobia, Homophobia, and Biphobia (IDAHOT) at Bangkok Art and Culture Centre More>>

Displaced Iraqis Face Difficulties As Fighting Continues

UNHCR is concerned about the processing arrangements in place at the Bzabz bridge – a series of pontoons across the Euphrates River which marks the boundary between Anbar province and the capital, Baghdad. Photo: UNHCR/G. Ohara More>>

UNESCO Chief Condemns Killing Of Bangladeshi Blogger

Director-General of the UN Educational, Scientific and Cultural Organization (UNESCO), Irina Bokova. UN Photo/Devra Berkowitz The head of the United Nations agency with a mandate to defend freedom of expression and press freedom worldwide today voiced ... More>>

Philadelphia: Train Crash

Five people have been confirmed dead and more than 136 people injured after an Amtrak train crashed in Philadelphia today at 9.20pm local time.More>>

UN News: Alarming Surge In Bay Of Bengal Crossings

The number of irregular migrants crossing the Bay of Bengal has almost doubled over the past year amid a dangerous uptick in human smuggling and trafficking across the region, according to a new report from the United Nations refugee agency. More>>

Get More From Scoop

 
 
 
 
 
World
Search Scoop  
 
 
Powered by Vodafone
NZ independent news