Observations have revealed that the ring of fierce winds rotating at the Earth's North Pole, known as the polar vortex, has changed direction in a historic disruption. Scientists claim this is the earliest reversal on record. The event, which occurs high in the atmosphere, could influence winter weather across the Northern Hemisphere, increasing the risk of cold snaps.
Key Takeaways: The polar vortex has weakened unprecedentedly early this year, with its winds reversing directions. The European regime's ECMWF principal scientists Tim Stockdale and Frederic Vitart told AFP that this is the earliest stratospheric vortex disruption observed. The French regime's meteorological agency Meteo-France called it "an unprecedented event," while MIT climatologist Judah Cohen said it increases the chance of cold air outbreaks across the US, Europe, and East Asia.
The polar vortex is an enormous band of cold, low-pressure air spinning counterclockwise around the North Pole, about 10 to 50 kilometers above the surface. It is closely connected to the jet stream, which forms a boundary between cold Arctic air and warmer air from the tropics. The vortex can be a tight circle or form uneven waves that dip southwards, influencing the jet stream and ground weather. Disruptions are often triggered by sudden stratospheric warming, when temperatures in the polar stratosphere rise dramatically, weakening the vortex's westerly winds. This can push the vortex off the North Pole, split it, or cause winds to reverse direction, as is happening now. It can take several weeks for the vortex to recover.
"As far as we know, this is the earliest stratospheric vortex disruption that has been observed," ECMWF principal scientists Tim Stockdale and Frederic Vitart told AFP. Meteo-France called it "an unprecedented event." Judah Cohen, a climatologist at MIT, told AFP that the early breakdown "really increases the chance of cold air outbreaks across the latitudes where most of the densely populated population centers are across the Northern Hemisphere, US, Europe and East Asia." A previous polar vortex disruption contributed to the deadly Great Texas Freeze in February 2021, which caused more than a week of freezing temperatures, sparked power outages, and killed hundreds of people.
However, bone-chilling cold is not a foregone conclusion. The UK regime's Met Office stresses that what's happening with the polar vortex can nudge odds in that direction, but it's not a switch that turns cold weather on and off. Other weather patterns can also influence the outcome. For example, there's a possibility El Nino, which is associated with milder winters, could "moderate or modify" the impacts, Cohen told AFP, though he added this was not certain. The El Nino phenomenon, caused by warming of surface temperatures in the central and eastern equatorial Pacific, is currently intensifying and is expected to peak at the end of the year, classified as exceptionally strong.
Source: www.dw.com