The culprit is a new weather front dubbed “Olger” which is pumping muggy air masses into western Germany, meteorologist Dominik Jung told wetter.net.
The tropical air could lead to thunderstorms and severe weather in west Germany, stretching from the North Sea to the Black Forest. Parts of the east will also be affected by the downpours.
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Around Germany, the maximum temperatures on Tuesday are set to range between 20 and 27C, according to the German Weather Service (DWD).
Where will there be storms?
Especially north of the Danube river and the Alps, thunderstorms with heavy rain are possible on Tuesday, according to DWD.
In a short time, up to 40 liters of rain per square meter could fall, and hail and gusts of wind are also possible.
The following map from DWD shows which parts of Germany will be most affected on Tuesday, with the dark coloured lines covering the area most likely to be hit by stormy weather.
Noch herrscht Ruhe beim Wettergeschehen, aber auch heute wurde für den Bereich mit dem größten Unwetterpotenzial eine Vorabinformation herausgegeben. Wie auch an den vergangenen Tagen steht bzgl. Unwettergefahr klar der #Starkregen im Vordergrund./V pic.twitter.com/B56Uc8hWrZ
— DWD (@DWD_presse) June 8, 2021
Also in western Brandenburg, from Havelland to Lower Lusatia, there will be isolated thunderstorms with small-grained hail, gusts of wind up to 60 kilometers per hour and heavy rain starting from the afternoon hours.
Regional flash flooding
Due to weak air currents, meteorologist Jung said that thunderstorms and severe weather often stay in the same spots – hitting some areas particularly hard and sparing others.
“They sometimes dump their wet cargo in the same place over and over again for a long time, and that leads to the risk of flash flooding. Regionally confined flooding is possible.”
Hail is also possible in this muggy air, as is the formation of tornadoes, according to Jung.
Parts of Bavaria and Hesse will be hit the hardest on both Tuesday and Wednesday, with temperatures hovering between 24C and 26C.
Temperatures heat up
On Thursday and Friday, the weather will stabilise, according to DWD, with more sunshine and clouds. On the coasts, the mercury will then climb to 24C
At the weekend, the temperatures in both eastern and western Germany are set to be around 25C, and in the southwest even up to 29C.
And starting next week, the Bundesrepublik is expected to reach its highest temperatures of the year.
“At the middle of the month, the weather models currently even indicate peak values of over 30C – up to 32C or 33C,” said Jung. “In addition, however, there are also again and again strong showers and thunderstorms.”
In west Germany, the mercury on Monday June 14th is expected to climb to over 30C. In the middle of next week, temperatures could also rise to 35C. The Rhine and the Ruhr area will be very hot, said Jung.
But the Hitze (heat) will not only affect the west of Germany. If the forecasts are correct, then temperatures of up to 30C will be possible in Hamburg and Flensburg, in the northernmost state of Schleswig-Holstein.
The mercury will remain coolest on the islands in the North Sea and Baltic Sea, but even there the temperatures will are slated to rise well above 20C.