The UK may soon experience a return of the weather phenomenon responsible for the notorious ‘Beast from the East’ event in 2018. Known as sudden stratospheric warming (SSW), this atmospheric occurrence could trigger colder conditions and even snow across parts of the country.
Meteorologist Nick Finnis from Netweather reports that SSW might develop around November 25 and 26. This event involves a significant warming in the stratosphere, originating from the Canadian side of the polar region. Such a warming typically disrupts the usual position of the stratospheric polar vortex, pushing it away from the Arctic and towards northern Russia and northeast Europe.
According to Finnis, this shift could drive cold Arctic air further south into northern Europe during late November and possibly into December. While the UK could see an increased risk of cold snaps and wintry weather as a result, he cautions that a sudden stratospheric warming does not guarantee colder weather.
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Looking ahead, the Met Office forecasts a widespread frost starting Friday, November 17, before more unsettled conditions arrive with Atlantic weather fronts moving into the UK. These fronts are expected to bring widespread rain, with southern regions likely facing the wettest weather and some periods of strong wind.
Snowfall chances are predicted to decrease compared to earlier November, though some upland snow is still possible in northern areas. Temperatures are expected to hover near average for late November, with mild spells likely in southern parts of the UK.
In summary, while sudden stratospheric warming could set the stage for colder, potentially wintry weather, uncertainty remains. The UK should prepare for a mix of frost, rain, wind, and fluctuating temperatures as the month progresses.