While Spring 2021 was bringing cold temperature and low geopotential anomaly to Europe and more warm spells in North America and Asia, Summer 2021 has started with opposite circulation pattern – hot Europe and coldwaves in North America or Asia.
About circulation anomalies in 2021 we have written before cca month here /A big European circulation anomaly in 2021: totally oppositely such as in the World (!) and showing, what climate change should bring until 2100 – mkweather/.
While during last 5 months (January – May 2021), extremely strong Greenland high was persisting above Greenland and often was shifting above Europe, during 1.-11. June 2021, extremely low geopotential anomaly has created above the region, with result of opposite anomalies on both shores of Europe.
While Europe hit (and only hits) extreme heatwaves /Mediterranean +45°C, Central Europe +35°C, Scandinavia +34°C and the UK +32°C: Heatwaves will come in 2 peaks, around 16. and 22. June 2021 – mkweather/, eastern Canada and NE USA hit severe coldwave with rare summer snowing /Newfoundland and southern Quebec with rare summer snowfall, last time was snowing in 1976 – mkweather/.
On the other hand, in northern USA and south-central Canada appeared a blocking high /The first +40°C heatwave since 1989! Manitoba (+41,3°C), Minnesota, North/South Dakota (+41,1°C) – mkweather/ and Siberia became very cold, such a remnant on the front side of blocking high above European Russia.
According to expectations, eastern USA, monsoon Asia, but too Mediterranean were more stormy, than average, so far.
It´s a question, how long this, for year 2021 untypical circulation pattern will persist across Northern Hemisphere. According to our experimental forecast update for Europe /Experimental forecast for Summer 2021 update: colder 20.6.-10.7., hot blocking high above Eastern Europe in July (2010 pattern), peaks around 15.6, 15.7. and 5.8. and autumn after 20.8. – mkweather/, already between 20.6.-10.7. 2021 northwestern Europe should again see colder weather, but ECMWF sees this pattern only very limited /ECMWF: July should be even hotter than we thought, cold will be only NW shores of Europe – mkweather/.
Meanwhile, in Canada and eastern USA, the next coldwaves, in western and central USA heatwaves are forecasted, Western Siberia will be cold and Eastern Siberia gradually hot during the second decade of June 2021.
Many parts of Europe, should preserve hot temperature anomalies in June and probably in July 2021, too, on composites, therefore, Summer 2021 should be after extremely cold Spring 2021 /Meteorologists across Europe report the coldest spring since 1987 / 2013 – mkweather/ relatively a big surprise.
Source of composites: Daily Climate Composites: NOAA Physical Sciences Laboratory
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