La Niña over, says PAGASA

The La Niña event has officially ended as manifested by the normal sea surface temperatures in the Pacific Ocean, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) announced Monday.

In its final La Niña advisory, PAGASA cited climate indicators and computer models returning to neutral conditions until the end of 2011.

La Niña is characterized by unusually cool ocean surface temperatures in the central and eastern tropical Pacific, associated with strong rainfall in Asia and Australia, chilling weather in North America, and drought in South America.

However, Undersecretary Dr. Graciano Yumul Jr., PAGASA’s supervising officer, said “a lag time on La Niña’s effects may result in intense rains during the typhoon season, which is expected from June to August.”

PAGASA said weather systems that are expected to prevail this month are the inter-tropical convergence zone (ITCZ), low pressure area (LPA), monsoon trough, ridge of high pressure area (HPA), and two to three tropical cyclones.

Read more at Manila Bulletin

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