The long-awaited La Niña has finally arrived but it is weak and meteorologists say it's unlikely to cause as many weather problems as usual. Experts have been expecting the arrival of the climate phenomenon since last spring but finally,

NOAA has declared that a La Niña is underway. This cool weather event is likely to be shorter and weaker than usual, but will still affect global weather and climate.

Its delayed arrival may have been influenced — or masked — by the world's oceans being much warmer the last few years, said Michelle L'Heureux, head of NOAA's El Nino team. “It’s totally not clear why this La Nina is so late to form, and I have no ...

Weather patterns across the U.S. and the world from October through December resembled patterns from previous La Niña events. La Niña is considered to be the cool phase of the El Niño-Southern Oscillation (ENSO) and is characterized by lower-than-average sea-surface temperatures,

The National Oceanic and Atmosphere Administration announced this week La Niña has arrived. This usually means the northern parts of California and the U.S. see more rainfall while Southern California sees less rain.

A La Niña advisory is in effect. La Niña occurs when the ocean's surface temperatures in the central and east-central equatorial Pacific reach a specific cooler-than-average level, as circled below. In addition, the response of atmospheric circulations globally are also considered.

It's not great news for the Gulf Coast and other storm-prone regions: La Niña is associated with more tropical activity in the Atlantic Ocean. But this event might not make it to hurricane season.

The latest El Nino-Southern Oscillation (ENSO) update by the National Oceanic and Atmospheric Administration on Jan. 9 announced La Nina's arrival.

NOAA's Climate Prediction Center (CPC) announced Thursday that water temperatures in critical parts of the Pacific Ocean had finally reached the threshold required for La Niña to emerge in December.

A long-awaited La Niña has finally appeared, but meteorologists say the periodic cooling of Pacific Ocean waters is weak and unlikely to cause as many weather problems as usual.

NOAA Says La Nina Ocean Cooling Has Finally Arrived, but It's Weak and May Cause Fewer Problems A long-awaited La Nina has finally appeared, but the periodic cooling of Pacific Ocean waters is ...

head of NOAA's El Nino team. “It’s totally not clear why this La Nina is so late to form, and I have no doubt it’s going to be a topic of a lot of research,” L'Heureux said. In the United ...