La Niña could be forming in the central Pacific

Climate scientists in the United States report that La Niña is making a comeback in the Pacific.

This would mean heavier rains in Guanacaste in November and December.

The U.S. National Oceanic and Atmospheric Administration said that evidence suggests that La Niña will return during the North American winter.

The Costa Rican Instituto Meteorológico Nacional has not weighed in on the topic, but various U.S. predictive models, noting that colder-than-average waters are once again upwelling in the tropical Pacific Ocean, say that La Niña appears to be re-forming.

La Niña and the opposite El Niño conditions
alternate in the central Pacific, but sometimes, as is the case now, conditions are called neutral.

El Niño is marked by warmer than average water temperature in the Central Pacific. Generally this means drier conditions in Guanacaste and much of Costa Rica. But not the Caribbean coast.

Typically the Caribbean is wetter during El Niño conditions and drier during La Niña.

That also is true of the U.S. Southwest, which has been suffering under a prolonged drought. The advent of La Niña is bad news for the Southwestern states where El Niño usually means wet weather.

La Niña can mean up to 70 percent more rain mainly in Guanacaste. That would not be unwelcome by the farmers and ranchers there as long as heavy rains did not cause damage.

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