Extreme Weather In Southern Germany June 2021

Peter Engelmann, July 3, 2021

2021: A cold spring with temperatures in May below average. Luckily there was lot of rain in parts of Germany after a drought since 2018 in some areas which damaged trees and raised serious concerns for example about the future of the water balance and water supply. In June a heat wave followed. However unlike in previous years there were no long lasting high pressure systems. The weather situation wasn’t so far stable for a long time. The heat wave ended with some extreme weather events. And again, we had situations for example in South-West-Germany or in Landshut, lower Bavaria, which were unprecedented. There are a lot of discussions now going on if this is climate-change related or if it is another rare weather pattern.

Things began to change in Bavaria June 20, 2021. The days before had been mostly dry except first thunderstorms in the Southwest and in the Alps. On June 20 there were some rumble and not so intense lightning in the region west of lake Ammersee. As usual there are huge local differences: There were soon stronger thunderstorm whereas a few kilometres apart from that place nothing or little happened. That’s very usual and always challenges weather forecasters.

Thunderstorm in the early evening hours of June 20:

Short lived thunderstorm cell June 20, 2021

The next days there was a much different weather situation: In the late afternoon or evening real strong thunderstorms occurred. Rotating supercell storms were also reported in the Southern Germany. Even more extreme weather happened in France where an air mass boundary created havoc. In France huge clusters of thunderstorms formed repeatedly and moved to Belgium and North-West Germany.

Strong thunderstorm on June 24, 6.45 p.m. near Diessen (Lake Ammersee, Upper Bavaria)

Thunderstorm approaching June 24, 2021

The extreme weather with strong thunderstorms, flash-floods, even extreme hail with enormous hailstones and masses of hail lasted for a couple of days. The reason: The air mass boundary moved only slowly in Europe. It worked like a machine charging up the atmosphere and creating new thunderstorms. A time-lapse video from June 21, 2021 late afternoon gives you some idea how quickly the storms formed:

It was interesting that there were very different types of thunderstorms. The location southwest of the Ammersee experience short-lived thunderstorms, a thunderstorm which arrived very quickly as the next day there was slow movement and plenty of time to take pictures. In the night there was also one of the “stroboscope”-like thunderstorms, where you hear not much loud thunder but you see an incredible light show with high rates of flashes. There were both thunderstorms without wind and thunderstorms with very strong wind.

The thunderstorm on June 24 created some great lightning:

Lightning June 24, 2021

The storm below occurred June 28, 2021 and brought intense lightning. However it was completely different as the “strobe-storm” the night before before. The lightning was also better visible. After one of the storms there was also a thick mist around sunset. Later the mist vanished and another thunderstorm with strong lightning occurred. The stronger storms came mostly from the Alps.

Thunderstorm in the evening of June 28, 10.00 p.m:

Lightning June 28. 2021

Flash Floods and Super Cell Storms

Finally there was an exchange of air mass. The hot humid air was replaced by colder air. June 29 was the climax of the series of thunderstorms in Germany: In Bavaria, a super-cell coming from Baden-Württemberg, intensified and brought an incredibly flash flood in Landshut Lower Bavaria. The days before a deadly tornado happened in the Czech republic. The video shows the aftermath of the big storm on June 29 which was accompanied by very strong winds.

Here is also an interesting thing for photographers and videographers: Usually most people are interested to catch a storm coming to them or before it happens. But there is a lot of possibilities to get interesting moods and pictures when the storm passed. The video belows shows what was going on in the atmosphere after this huge thunderstorm on June 29.

Magnificient Skies And Brilliant Colors Like Never Before

April 6, 2020

The Corona crisis is an unparalleled situation and there is no bright side to this. It would have been wonderful if we could have made observations about changes in the atmosphere, weather and perhaps climate change under different circumstances. Nevertheless, it appears there is a unique chance for a potentially positive change in the future. For some days we see for the time how a sky would look like with little or no pollution in the air.

When the crisis reached Europe and the rest of the world air traffic declined. In Germany, there was a lockdown after middle of march. There are fewer planes operating. We now see an immediate effect: In Middle Europe, there was a high-pressure weather pattern in March and is still lasting in April. The air became clear and cold with some dust in the morning. However, there was a new quality in the atmosphere.

Over the last years there was a lot of pollution in the atmosphere due to increasing air traffic. The contrails never disappeared. The sky always looked dirty. It looked liked as the atmosphere couldn’t take any more. It was too much pollution. The result was often a strange sky with unusual clouds which presumably inspired the “Chemtrail Conspiracy theory”.

Now we have a chance to see how a sky without pollution and air-plane traffic looks like. It is not only like looking through a window which was cleaned up after a long time. We see different colors. There is some otherworldliness too it. It is like entering a different realm, a world remembered from childhood days for the elder generation.

The absence of pollution and air traffic doesn’t only mean clear skies and great colors. It looks like a healthier world and might have also effects for weather and climate. Hopefully there is a chance for scientists to do research even the circumstances appear difficult.

Air traffic created an artificial cloud layer on many days. Thus, there was less cooling in the night. The pollution added to global warming. We will see how weather patterns develop if there is little or now pollution in the upper atmosphere.

There is another interesting question: We don’t know very much about cloud development and how the increased air traffic has changed the development of clouds as rain clouds. Over the last years climate change led to many droughts. Scientists say this is mostly because of the CO2 emission but perhaps there are other factors. If we see more clouds now like we had a long time ago it could mean that air traffic had a much bigger impact than previously assumed.

Sky In Upper Bavaria before “Shutdown” with residue of airplane exhaust
Another Image with airplane residue near Mitenwald

Sky after lockdown end of March after shower
Sunset April 1, 2020
The next day.
April 5, 2020, Sunday Afternoon

June 2019: Dramatic Hailstorm put sailors in danger and a monster Heatwave.

May 2019 was the first month in Middle Europe for a long time which wasn’t too hot. There were some rainy days. It seemed that weather might turn in a more “normal” mode compared to 2018. This was before June. In the larger Munich area people experienced a freak hail storm on Whit Monday. There was also severe weather in other parts of Germany in the first half of June. Later the month, large parts of Europe suffered from one of the most extreme heatwaves ever recorded.

Aftermath of severe Hailstorm in Munich region

Thunderstorms and severe weather didn’t came unexpected on pentecost. Weather models showed a highly likelyhood for thunderstorms in the Alps and the Upper Bavaria region. However the events on June 10 proved again how tricky severe weather developments can be and how difficult it is to set precicely the right weather alert in motion.

Sunday, June 9, was more or less a qiet day. It was getting warmer in Upper Bavaria and other regions. There were already weather warnings issued. On Monday, June 10, the alert system of the huge lake Ammersee south-west of Munich was activated in the morning hours, but then it was quiet for most of the day. A lot of tourists enjoyed the holiday in Germany. People were swimming and sailing. Weather forecasters and and the lifeguard service were still expecting something to happen.

The weather radar showed signals getting stronger in the Allgäu and the Upland before the Alps around Kempten after noon. Here an incredibly strong cell was building up. When I checked the radar a couple of times in the early afternoon however, I couldn’t figure out which path that storm would take. I also didn’t figured out how fast this monsterstorm would move eastwards, so I was also surprised when it suddenly became really dark on this summer afternoon.

It was around 16.23pm when the orange alarm lights at the Bavarian lakes were activated again. There were still a lot of sailors out there. At one lake the lifeguard service warned people who were still swimming in the “Wörthsee” and closed the shore. 50 minutes later all hell brake loose on lake Ammersee. The Starnberger Merkur Newspaper later published a very interesting coverage.

Alex Beck, a sailor, told later the Merkur-reporters that the storm-cell was “racing”. Very soon the lifeguard service had to solve hands full over the next hours.

The same applied to firestarters and police: The thunderstorm left a path of destruction beginning in the Allgäu, hit several communities around the North side of the lake Ammersee region and also hit the west and the north of the Munich area.

Hailstorms in Upper Bavaria are not unusual. There is particularly a history for severe weather in May and around Pentecoste. What’s so unusual was the path, which was hard to predict. Big hail is often more seen in the South-East were there is even a special cloudseeding flyer unit for this problem. I didn’t find any report from a professional weather researcher, but I am sure this was a strong super-cell. Super-cells are more likely to take unusual paths.

The intensity was the other unusual fact. I experienced also strong wind gusts and smaller hail but 10 km to the north it was raining hailstones with the size of tennis balls.

Within minutes roofs very destroyed, nameless cars damaged, a motorway tunnel was set under water, greenhouses were completely destroyed and also a grocery store. It ended up in estimated damage cost of 30 Mio. Euros.

The same time people on the lake Ammersee were struggling for their lives. A couple hung on their capsized sailing boat, others were stranded and another sailor couple were only safed by their “persenning”, a cover, from the hail bombardement. They had reached a buoy but couldn’t leave their ship. Then they had to wait out the storm. At this time they experienced waves like never before according the their account in the “Starnberger Merkur” newspaper.

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Another thunderstorm in June

The following weeks people began to recover from the hailstorm, settling insurance matters and repairing windows, cars and houses. There were more thunderstorms but nothing like the cell on June 10. However another extreme weather situation was already throwing a shadow.

Weather models predicted an enormorous heatwave for the second half of June. Weather services were astonished by themselves about the numbers. And the models were mostly right. Germany saw new temperature records but not the 40 degrees Celsius. Nevertheless, there were set many new records. It didn’t took long and the bushfires, which were a problem in May started, again.

France saw the worst with some over 40 degree Celsius records. The authorities had to issue a state of emergency in some areas. Particularly Southern France was affected.

The situation calmed by the end of month. On July 1, 2019, a cold front with thunderstorms reached Southern Germany. There are still wildfires raging. The heatwave is only part of a problem which has the potential to become the real big threat for the near future: In wide parts of Germany there is still a drought. The government published recently a study about the effects of a drought lasting several years.

cold front and thunderstorms July 1, 2019

Series Of Strong Windstorms In March 2019

After a period of warm days in February 2019 with a constant high-pressure system over Middle Europe weather became more dynamic. With the jet stream moving to Europe a series of low-pressure systems reached the continent. It was very windy for a couple of days. Severe weather was included with European windstorms as “Bennet” and “Eberhard” (known as Freya in the UK) and even a tornado. In Germany, (Nordrhein-Westfalen in particular) France and Switzerland wind gusts led to serious damage. There is an estimate that in Germany insured property losses of around EUR 800 million happened. Travel by train was stopped for one day creating chaos for travellers in Middle Europe.

Storm Eberhard arrives March 10, 2019 in Upper Bavaria with winds of 10 Beaufort strength

The sky was always turbulent with many interesting cloud patterns which allowed some impressing storm pictures. In Germany and Europe, the change in weather was welcomed because there is still a need for rain. Last year’s extreme drought left a lot of problems. Particularly the forest areas need still a lot of water to recover from the drought. It did indeed rain a lot in some areas but there is still a need for much more rain in the next months. The weeks in February with unusual long lasting dry weather raised already concerns for a new drought coming in 2019.

Storms are pretty normal in March. There had been even extreme windstorms in previous decades. Thus, the period of days with windy weather is no exception from the rule. But it was interesting that wind was blowing for many hours with strong wind gusts. This led to questions if this is a normal weather pattern. Honest answers prove to be difficult.

The rising numbers of weather anomalies due to climate change during the last years provoke a higher-sensibility to unusual weather phenomena. However, the weather is always like a big drama. There is an incredible variety of extremes. Researchers need to observe weather over long time spans to identify anomalies and unusual trends.

On the other side, Europe is affected by a number of winter windstorms over the last 30 years with the most damaging storms 1989/90. Insurances are alarmed about the rising cost of damage. Since these storm events are still relatively rare further research is required. The UK Met-office published recently a study with the most important findings of winter windstorms.

The series of storms showed some interesting developments. The wind came mostly from the west, sometimes South-West. In Upper-Bavaria there were days where there was a very good long distant view. The Alps appeared very clearly.

Waves hitting shore and a clear sight of the Alps in the background, Saturday, March 16, Lake Ammersee.

At the end of the weeks with stormy weather, there were showers with snow and little hail. This created some impressing sights shortly before sunset

In the aftermath of windstorm Eberhard temperatures decreased and there were snow and little hail showers illuminated by the sun.

A look into the south with a shower cloud above the Bavarian Upland

There were huge waves on the lakes in Bavaria due to the storm. A lot of driftwood appeared on the Eastern side of Lake Ammersee. It was an unusual sight. The lake appeared more like a shore at the Baltic Sea.

A lake in Upper Bavaria with waves.

After March 18 the weather calmed down. A high-pressure system led to cold but sunny weather in Southern Germany.