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June 2020 temperature anomalies in Arctic Siberia were striking.

The maximum temperature anomaly in ERA5 0.25° gridded data was 10.3°C, which is the highest value in the Northern Hemisphere at any summer month since 1979 (so in the whole dataset).
Verkhoyansk, Russia has been widely in the news for its all-time heat record set in June 2020.

The recent temperature trend during the past three years in the month of June looks certainly worrying. #HockeyStick

Data from pogodaiklimat.ru/history/24266.…
Interesting discussion on the factors leading to #SiberianHeatwave by @CopernicusECMWF can be found here: climate.copernicus.eu/arctic-siberia…
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Mika Rantanen
@mikarantane
Beautiful summer windstorm with very pronounced structures in Baltic sea right now. Possibly some damage expected at the coast of Estonia and Latvia later today due to 25-30 m/s wind gusts.
The surface low was associated with a "tropopause cyclone" (or tropopause polar vortex) which dropped south from Arctic ocean (see atmos.albany.edu/student/abentl…).

For this reason, the dynamic tropopause has been anomalously low: e.g. in Jokioinen only at 400 hPa (~7 km).
This kind of strong and "top-heavy" cyclones are rare in July. The sounding observations from Jokioinen, Finland shows that only two times during the 62-year history the 500 mb heights in July has been lower than now.
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