(1/) The surface temperature anomaly response to the #SSW has been qualitatively close, for the hemisphere as a whole, to what we might expect from the averaged 0-30 day response following past SSWs, as mentioned in this post ( https://www.climate.gov/news-features/blogs/enso/sudden-stratospheric-warming-and-polar-vortex-early-2021)

(2/) notably missing, at least thus far, are cold anomalies over the UK/central Europe, and the eastern USA. But in a study led by @Domeisen_D, we found that these regions did not see enhanced skill prediction following #SSWs...

(3/) We think this is because these are the regions most sensitive to the exact location of the shift of the North Atlantic jet stream/Arctic blocking, which means impacts can be highly variable in those regions for a particular #SSW.

(4/) Upcoming forecasts suggest a change in the weather pattern could be coming to these regions in Feb, so it's possible when we look at the 60 days after this event, it might look more like the "composite" response in the end.

Study by Domeisen et al. 2019 can be found here: https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JD030923