La Nina, the flip side of the better known El Nino weather condition, keeps popping up.
FILE - The Manayunk neighborhood in Philadelphia is flooded Thursday, Sept. 2, 2021, in the aftermath of downpours and high winds from the remnants of Hurricane Ida. La Nina, the natural but potent weather event linked to more drought and wildfires in the western United States and more Atlantic hurricanes, is becoming the nations unwanted weather guest and meteorologists said the Wests megadrought wont go away until La Nina does.
Something weird is up with La Nina, the natural but potent weather event linked to more drought and wildfires in the western United States and more Atlantic hurricanes. It’s becoming the nation’s unwanted weather guest and meteorologists said the West’s megadrought won’t go away until La Nina does.set a record for strength last month and is forecast to likely be around for a rare but not quite unprecedented third straight winter. And it’s not just this one. Scientists are noticing that in the past 25 years the world seems to be getting more La Ninas than it used to and that is just the opposite of what their best computer model simulations say should be happening with human-caused“They don’t know when to leave,” said Michelle L’Heureux, head of the National Oceanic and Atmospheric Administration forecast office for La Nina and its more famous flip side, El Nino. An Associated Press statistical analysis of winter La Ninas show that they used to happen about 28% of the time from 1950 to 1999, but in the past 25 winters, they’ve been brewing nearly half the time. There’s a small chance that this effect could be random, but if the La Nina sticks around this winter, as forecast, that would push the trend over the statistically significant line, which is key in science, said L’Heureux. Her own analysis shows that La Nina-like conditions are occurring more often in the last 40 years. Other new studies are showing similar patterns. What’s bothering many scientists is that their go-to climate simulation models that tend to get conditions right over the rest of the globe predict more El Ninos, not La Ninas, and that’s causing contention in the climate community about what to believe, according to Columbia University climate scientist Richard Seager and MIT hurricane scientist Kerry Emanuel.What Seager and other scientists said is happening is that the eastern equatorial Atlantic is not warming as fast as the western equatorial Atlantic or even the rest of the world with climate change. And it’s not the amount of warming that matters but the difference between the west and east. The more the difference, the more likely a La Nina, the less the difference, the more likely an El Nino. Scientists speculate it could be related to another natural cycle, called the Pacific Decadal Oscillation, or it could be caused by human-caused climate change or both. “At this point we just don't know,” L'Heureux said. “Scientists are watching and I know, are actively studying. But it’s really important because of regional conditions. We need to get this right.” La Nina is a natural and cyclical cooling of parts of the equatorial Pacific that changes weather patterns worldwide, as opposed to El Nino’s warming. Often leading to more Atlantic hurricanes, less rain and more wildfires in the West and agricultural losses in the middle of the country, studies have shown La Nina is more expensive to the United States than the El Nino. Together El Nino, La Nina and the neutral condition are called ENSO, which stands for El Nino Southern Oscillation, and they have one of the largest natural effects on climate, at times augmenting and other times dampening the big effects of human-caused climate change from the burning of coal, oil and gas, scientists said.“They really have a very, very strong” effect, said research scientist Azhar Ehsan, who heads Columbia University’s El Nino/La Nina forecasting. “So a third consecutive La Nina is not at all a welcome thing.”
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Read more »
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