Satellite view showing the beginning interaction of Cyclone Emma nearing from the Southwest and Anticyclone Hartmut covering Europe from the Northeast on 27 February. As the collision of the systems continued, Emma's structure became much more distorted on 28 February.
25 February 2018 – 4 March: Hartmut, an exceptionally strong anticyclone whose winds peaked at 187 km/h (116 mph) and whose central pressure peaked at 1056 hPa, both in Scandinavia. This anticyclonic storm with hurricane-force maximum gusts channeled freezing air from a Siberian airmass all over Europe, triggering the Beast from the East, a deadly cold wave with historical significance. Having dropped large amounts of snow in some European areas, Hartmut was a rare instance of an "anticyclonic blizzard". The interaction of Anticyclone Hartmut and Cyclone Emma intensified the wind and snowfall threat in Western Europe, particularly on the British Isles.