Judah Cohen on Twitter: "For those interested at an early look, the blog, is now available for a fee. I've been conflicted about the evolution of the pattern across the N Hemisphere
![New study examines the record-breaking polar vortex and related extremes during the winter of 2019/2020: NOAA Physical Sciences Laboratory New study examines the record-breaking polar vortex and related extremes during the winter of 2019/2020: NOAA Physical Sciences Laboratory](https://psl.noaa.gov/news/2020/img/polar-vortex_earthnullschool.png)
New study examines the record-breaking polar vortex and related extremes during the winter of 2019/2020: NOAA Physical Sciences Laboratory
![Polar Vortex now starts to slow down, affecting the weather patterns in the coming weeks, as we head deeper into Spring Polar Vortex now starts to slow down, affecting the weather patterns in the coming weeks, as we head deeper into Spring](https://www.severe-weather.eu/wp-content/gallery/world-weather/weather-forecast-march-april-2021-united-states-europe-polar-vortex-warming.png)
Polar Vortex now starts to slow down, affecting the weather patterns in the coming weeks, as we head deeper into Spring
![Negative Arctic oscillation conditions are associated with higher than... | Download Scientific Diagram Negative Arctic oscillation conditions are associated with higher than... | Download Scientific Diagram](https://www.researchgate.net/publication/235329809/figure/fig1/AS:655160351129609@1533213808197/Negative-Arctic-oscillation-conditions-are-associated-with-higher-than-usual-atmospheric.png)
Negative Arctic oscillation conditions are associated with higher than... | Download Scientific Diagram
![A warming event begins for the Polar Vortex in the stratosphere, powered by the strong cross-polar ridging, as we head into the 2022 Spring season » Severe Weather Europe A warming event begins for the Polar Vortex in the stratosphere, powered by the strong cross-polar ridging, as we head into the 2022 Spring season » Severe Weather Europe](https://www.severe-weather.eu/wp-content/gallery/andrej-news/weather-forecast-north-hemisphere-what-is-strong-weak-polar-vortex-winter-pattern-update.png)
A warming event begins for the Polar Vortex in the stratosphere, powered by the strong cross-polar ridging, as we head into the 2022 Spring season » Severe Weather Europe
![The stratospheric polar vortex and sudden stratospheric warmings - Lee - 2021 - Weather - Wiley Online Library The stratospheric polar vortex and sudden stratospheric warmings - Lee - 2021 - Weather - Wiley Online Library](https://rmets.onlinelibrary.wiley.com/cms/asset/0aac016f-0dbc-463a-ab85-609d203f3768/wea3868-toc-0001-m.jpg)
The stratospheric polar vortex and sudden stratospheric warmings - Lee - 2021 - Weather - Wiley Online Library
![Northern hemisphere cold air outbreaks are more likely to be severe during weak polar vortex conditions | Communications Earth & Environment Northern hemisphere cold air outbreaks are more likely to be severe during weak polar vortex conditions | Communications Earth & Environment](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs43247-021-00215-6/MediaObjects/43247_2021_215_Fig1_HTML.png)
Northern hemisphere cold air outbreaks are more likely to be severe during weak polar vortex conditions | Communications Earth & Environment
![Frontiers | Analysis of the Positive Arctic Oscillation Index Event and Its Influence in the Winter and Spring of 2019/2020 Frontiers | Analysis of the Positive Arctic Oscillation Index Event and Its Influence in the Winter and Spring of 2019/2020](https://www.frontiersin.org/files/Articles/580601/feart-08-580601-HTML/image_m/feart-08-580601-g011.jpg)
Frontiers | Analysis of the Positive Arctic Oscillation Index Event and Its Influence in the Winter and Spring of 2019/2020
![Stratospheric Polar Vortex returns for Winter 2021/2022, together with a strong easterly wind anomaly high above the Equator, impacting the Winter season Stratospheric Polar Vortex returns for Winter 2021/2022, together with a strong easterly wind anomaly high above the Equator, impacting the Winter season](https://www.severe-weather.eu/wp-content/gallery/world-weather/polar-vortex-winter-2021-2022-upper-stratosphere-wind-forecast.png)