La Nina, the flip side of the better known El Nino weather condition, keeps popping up, and it's more dangerous than its cousin.
worsened and in the early summer of 2021 it weakened enough that NOAA said conditions were neutral. But that pause only lasted a few months and by early fall 2021 La Nina was back, making it a double dip.
“These are very impressive values for April,” L’Heureux said. Still, because La Ninas historically weaken over summer and there are slight signs that this one may be easing a bit, there’s the small but increasing chance that this La Nina could warm just enough to be considered neutral in late summer.La Nina has its biggest effect in the winter and that’s when it is a problem for the West because it’s the rainy season that is supposed to recharge areas reservoirs.
“It’s much less likely that the Southwest will see at least even a partial recovery from the megadrought during La Nina,” Swain said.La Nina “amps up your Atlantic storms” but decreases them in the Pacific, said Colorado State University hurricane researcher Phil Klotzbach. When there’s an El Nino, there’s lots of Atlantic wind shear and it’s hard for hurricanes to get going. But La Nina means little wind shear in the Atlantic, making it easier for storms to intensify and do it quickly, said University of Albany hurricane researcher Kristen Corbosiero.“Whatever is the cause, the increasing incidence of La Ninas may be behind the increasing hurricanes,” MIT’s Emanuel said.
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