Extreme weather events in early Summer 2018 connected by a recurrent hemispheric wave-7 pattern.

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1088/1748-9326/ab13bf. This is version 6 of this Preprint.


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Kai Kornhuber, Scott Osprey, Dim Coumou, Stefan Petri, Vladimir Petoukhov, Stefan Rahmstorf, Lesley Gray


The summer of 2018 witnessed a number of extreme weather events such as heatwaves in North America, Western Europe and the Caspian Sea region and rainfall extremes in South-East Europe and Japan that occurred near-simultaneously. Here we show that these extremes were connected by an amplified hemisphere-wide wavenumber 7 circulation pattern. We show that this pattern constitutes a teleconnection in Northern Hemisphere summer associated with prolonged and above-normal temperatures in North America, Western Europe and the Caspian Sea region. This pattern was also observed during the European heatwaves of 2003, 2006, 2012 and 2015 among others. We show that the occurrence of this wave 7 pattern has increased over recent decades.




Atmospheric Sciences, Climate, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics


Heat Extremes, Jetstream, Rossby Waves, Summer 2018


Published: 2018-11-28 10:59

Last Updated: 2019-04-29 08:40

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CC BY Attribution 4.0 International

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