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Devastating Super-Cell Storm in Upper Bavaria on July 10, 2024

Peter Engelmann, July 11, 2024

Weather services warned the day before and were right: In the afternoon of Wednesday, July 10, 2024, a severe weather system hit Bavaria with full force. One epicenter of the devastating storm was the municipality of Holzkirchen, South of Munich. Large hail, flooding, gale-force winds, and lightning left chaos amid rush-hour traffic.

Fire Starters had their hands full of work with flooded cellars and damaged roofs. Rail transport was interrupted and was down for hours. Many overturned trees blocked streets and rails. Passengers were trapped for hours.

In West Upper Bavaria and elsewhere the approaching weather system was an awesome sight:

Shortly before 3. pm, a drama unfolds in the sky. Note the different layers of clouds which seemed stacked above each other. After approximately 20 minutes the weather system came closer fast.

As with previous extreme weather situations this year the amount of rain was impressive. Streets were flooded within minutes. The super-cell storm is the last in a series of extreme weather events in 2024. In May a flood set whole villages near Augsburg under water after days of rain. Weather remains unstable for a longer time. The amount of rain and sudden flash floods underline the change in the atmosphere. A warmer atmosphere due to human-made climate change can contain more atmospheric humidity and lead to more extreme weather: Heat waves and flooding are the new normal.

This might be mistaken for a tornado but it is a low-hanging cloud.

The severe weather system has approached with interesting and unique cloud patterns. In some moments it looked like the clouds would hit the ground. The timelapse video below shows the chaos in the atmosphere. It got pretty dark shortly before the rain arrived. Since the cameras are not waterproof the coverage presents only the beginning of the arriving storm. When the storm arrived there was some lighting and intense rain for a long time.

Even though it was the middle of the day it got pretty dark.

Late in the day, the rain stopped and the sun appeared again. But the humidity was still high and more thunderstorms are expected for the next days. The temperature was a bit lower but climbed again on the next day. July is the typical month in middle Europe for hot temperatures and severe thunderstorms. They happen more likely in the mountainous terrain in Southern Germany. The super-cell storm like yesterday, which often starts in the area where the river Lech leaves the Alps is called “Lechtalerin”. Typically it intensifies on its path to the East. These types of supercells are often long-living and move a long way. They should never be underestimated.

Nevertheless, the weather phenomena on the north side of the Alps are a unique opportunity for photographers and filmmakers to take breathing images and portray the forces of nature. Timelapses are revealing movements and dynamics in the weather system. In this case, two cameras were used for the video, one shot in timelapse mode, the other in normal mode with 60 fps. The coverage of the normal video was accelerated. This method gives more options to get good footage of thunderstorms.

July 11, 2024 by Waldmeister Categories: Climate Change, Severe Weather, Stormchasing, Thunderstorm, Uncategorized

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)

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:

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:

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.

July 3, 2021January 16, 2023 by Waldmeister Categories: Climate Change, Severe Weather, Stormchasing, Summer, Thunderstorm, Uncategorized, Wind, WindstormTags: flash flood, super cell, Thunderstorm

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

April 6, 2020June 24, 2020 by Waldmeister Categories: Climate Change, Spring, UncategorizedTags: clear sky, magnificient sky

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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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

July 4, 2019 by Waldmeister Categories: Climate Change, Severe Weather, Stormchasing, Summer, Thunderstorm, Uncategorized, Wind, WindstormTags: Ammersee, hailstorm, heatwave