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Article

The Polar Vortex and Extreme Weather: The Beast from the East in Winter 2018

1
NOAA/Pacific Marine Environmental Laboratory, Seattle, WA 98115, USA
2
School of Geographical Sciences, University of Bristol, Bristol BS8 1RL, UK
3
School of Geography and Lincoln Centre for Water and Planetary Health, University of Lincoln, Lincoln LN6 7TS, UK
4
Finnish Meteorological Institute, FI-00101 Helsinki, Finland
5
Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA 98105, USA
6
International Arctic Research Center and Department of Atmospheric Sciences, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(6), 664; https://doi.org/10.3390/atmos11060664
Received: 7 May 2020 / Revised: 12 June 2020 / Accepted: 15 June 2020 / Published: 22 June 2020
(This article belongs to the Special Issue The Impacts of Climate Change on Atmospheric Circulations)
Public attention has recently focused on high-impact extreme weather events in midlatitudes that originate in the sub-Arctic. We investigate movements of the stratospheric polar vortex (SPV) and related changes in lower atmospheric circulation during the February-March 2018 “Beast from the East” cold winter event that dramatically affected much of Europe and north-central North America. This study demonstrates that the movement of the SPV is a key linkage in late winter subarctic and northern midlatitude extreme weather events. February–March 2018 saw two types of subarctic-midlatitude weather connections. In the first type, the SPV was displaced from the pole to lower latitudes over North America in February and then was found over northern Siberia in March. Mid-February and mid-March are examples of persistent near vertically aligned geopotential height structures of the atmospheric circulation. These structures over North America and Eurasia advected cold Arctic air southward. The second type of cold surface event was associated with a weak regional SPV and a sudden stratospheric warming event over Europe during the second half of February. These late winter linkage events that arise through dynamic instabilities of the SPV are more common in the last decade, but the potential role of enhanced Arctic amplification is uncertain. View Full-Text
Keywords: polar vortex; Arctic; severe weather; potential vorticity polar vortex; Arctic; severe weather; potential vorticity
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MDPI and ACS Style

Overland, J.; Hall, R.; Hanna, E.; Karpechko, A.; Vihma, T.; Wang, M.; Zhang, X. The Polar Vortex and Extreme Weather: The Beast from the East in Winter 2018. Atmosphere 2020, 11, 664. https://doi.org/10.3390/atmos11060664

AMA Style

Overland J, Hall R, Hanna E, Karpechko A, Vihma T, Wang M, Zhang X. The Polar Vortex and Extreme Weather: The Beast from the East in Winter 2018. Atmosphere. 2020; 11(6):664. https://doi.org/10.3390/atmos11060664

Chicago/Turabian Style

Overland, James; Hall, Richard; Hanna, Edward; Karpechko, Alexey; Vihma, Timo; Wang, Muyin; Zhang, Xiangdong. 2020. "The Polar Vortex and Extreme Weather: The Beast from the East in Winter 2018" Atmosphere 11, no. 6: 664. https://doi.org/10.3390/atmos11060664

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