The high pressure system over the northern Atlantic is enhancing bringing warm air masses, for the last days of May, to Iceland and southeastern Greenland, while a strong jet stream helps arctic air masses to travel across Europe bridging a significant temperature drop equal to even 10°C for much of central and northern Europe.
Temperatures 10 to 15°C below normal across central and northern Europe: As the high pressure system touches Iceland, it will cut off the circulation of arctic air masses from Greenland, creating a long low system from the low to upper troposphere which will dominate central and northern Europe.This system will bring a significant temperature drop across much of central and northern Europe the next few days. In more detail, a graduale temperature drop will take place the next day into the regions with the last days of May feeling most of the cold. Temperatures will be 10 to 15°C below normal, which is unusual for the season. For example on Sunday 29/05 the maximum temperatures will be 14°C in Paris, 12°C in Amsterdam and Hamburg, 14°C in Copenhagen, 13°C in London and 10°C in Tallinn. Also, the northern countries of the Balkans and the northern regions of Italy will feel the cold mostly on Sunday.
Showers and thunderstorms locally heavy: The low pressure system will dominate and rotate across central and northern Europe, bringing brief scattered showers or thunderstorms which will be strong and will be accompanied locally by hail and strong gust winds. The countries that will be influenced the most will be Poland, Scandinavia, the Baltic states, Ukraine, Germany and Romania with accumulated rates reaching locally 50-80 mm during the next 5 days. Snow is also expected locally in northern Norway as temperatures will touch 0°C or less.
Temperatures 10-15C above normal in Iceland and eastern Greenland: As the high pressure system is touching the northern Atlantic, a strong jet stream will bring warm air masses to Iceland and Greenland. In more detail, the last 3 days of May will be particular and out of the ordinary warm with maximum temperatures reaching on Sunday-Monday locally 15-18°C in Ireland and 4-10°C in some regions of southeastern Greenland, resulting in intense ice melting.