La Nina outlook is easing says UN weather agency

May 23, 2011
A flooded street in the Colombian city of Rionegro in April 2011. Colombia has blamed last month's devastating floods on the La Nina waether phenomenon. The UN weather agency has said the La Nina weather pattern is easing and there are no signs suggesting a resurgence in the coming months.

La Nina, the disruptive weather pattern behind floods and droughts, is easing and there are no signs suggesting a resurgence in the coming months, the UN weather agency said on Monday.

"The La Nina episode, which caused disastrously wet conditions in certain regions and drought in others, is coming to an end," the World Meterological Organization said in a statement.

The , blamed for extremely heavy downpours in Australia, and South America over late 2010 and early 2011, is unlikely to redevelop in the middle of the year, it added.

"Looking ahead beyond mid-year 2011, there are currently no clear indications for enhanced risk of El Nino or La Nina in the second half of the year," it said.

"Near-neutral conditions are currently considered the most likely scenario for the second half of 2011," it added.

La Nina is characterized by unusually cool ocean surface temperatures in the central and eastern tropical Pacific.

It leads to increased rainfall across the western equatorial Pacific, northern South America and over December to February.

At the same time, drier than normal conditions are observed along coastal Ecuador, northwestern Peru and equatorial eastern Africa during the same period.

It also leads to sharply lower conditions throughout the world, including cooler than normal temperatures in Japan, southern Alaska and Brazil.

El Nino, meanwhile is the opposite condition of . It is characterised by unusually warm ocean temperatures in the central and eastern equatorial Pacific.

Explore further: Antarctic ice sheet is result of CO2 decrease, not continental breakup

add to favorites email to friend print save as pdf

Related Stories

La Nina strengthens: WMO

Oct 11, 2010

The disruptive La Nina weather pattern in the Pacific basin should strengthen over the next four to six months, heralding stronger monsoons and more hurricanes, the UN weather agency said on Monday.

La Nina weather pattern to last for months: UN agency

Jan 25, 2011

The weather pattern behind floods and extreme conditions in Australia, Asia, Africa and South America is one of the strongest ever and could last for four more months, the UN weather agency said Tuesday.

La Niña Anomaly Could Affect Winter Weather in Colorado

Nov 19, 2008

(PhysOrg.com) -- A strong La Niña that developed early last winter, only to disappear this summer, is showing signs of life again and could affect our winter weather, said University of Colorado at Boulder and NOAA atmospheric ...

Recommended for you

NASA sees zombie Tropical Depression Genevieve reborn

7 hours ago

Infrared imagery from NASA's Aqua satellite helped confirm that the remnant low pressure area of former Tropical Storm Genevieve has become a Zombie storm, and has been reborn as a tropical depression on ...

Wave energy impact on harbour operations investigated

12 hours ago

Infragravity period oscillations—waves that occur between 25 and 300 seconds with a wavelength between 100m and 10km—can have an impact on berthing operations, depending on a harbour's geometry.

User comments : 0