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Lake Constance is a tornado hotspot, German meteorologists say
🇩🇪 Germany /Disasters & Emergencies

Lake Constance is a tornado hotspot, German meteorologists say

From Die Zeit · () German

Translated from German, summarized and contextualized by DistantNews.

At a glance

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  • A tornado formed over Germany's Lake Constance, a region known as a tornado hotspot.
  • Meteorologists explain that warm lake waters and rapidly cooling air create atmospheric instability conducive to tornado formation.
  • The tornado, with estimated wind speeds of 100-150 km/h, lasted about 15 minutes over the water without causing damage.

A tornado recently formed over Lake Constance near Friedrichshafen, drawing onlookers. While visually striking, this phenomenon is not uncommon for the region. The German Weather Service (DWD) identifies Lake Constance as a "tornado hotspot" in Germany, with an average of two to three tornadoes forming there annually, particularly in mid to late summer.

If air vortices enter the strong updrafts of powerful thunderstorms, they are sucked upward and stretched by the low pressure in the cloud, causing wind speeds to increase continuously, forming a rapidly rotating air funnel – a tornado.

— Adrian LeyserAdrian Leyser, a member of the DWD's tornado expert group, explains the meteorological process behind tornado formation.

Meteorological conditions explain the frequent formation of waterspouts over the lake. The lake's surface water is particularly warm in summer, making the air above it more humid than surrounding areas. Simultaneously, temperatures drop more sharply with altitude, increasing atmospheric instability. These factors, according to DWD tornado expert Adrian Leyser, favor tornado development. "If air vortices enter the strong updrafts of powerful thunderstorms, they are sucked upward and stretched by the low pressure in the cloud," Leyser explained. "This causes wind speeds to increase continuously, forming a rapidly rotating air funnel – a tornado."

This causes wind speeds to increase continuously, forming a rapidly rotating air funnel – a tornado.

— Adrian LeyserAdrian Leyser, a member of the DWD's tornado expert group, explains the meteorological process behind tornado formation.

The condensation of water vapor in the air due to low pressure makes the funnel visible, sometimes resembling "windhosen" (wind hoses) or, over water, "wasserhosen" (waterspouts). While waterspouts occur several times a year on Lake Constance, many go unnoticed as they form far from shore or dissipate quickly. The recent tornado was notable for its visibility from land and its duration of approximately 15 minutes. Meteorologists estimated wind speeds between 100 and 150 kilometers per hour. No damage was reported as the tornado remained over the water. However, the DWD notes that tornadoes making landfall can cause significant destruction, with such wind speeds capable of felling trees or damaging roofs.

This causes wind speeds to increase continuously, forming a rapidly rotating air funnel – a tornado.

— Adrian LeyserAdrian Leyser, a member of the DWD's tornado expert group, explains the meteorological process behind tornado formation.
DistantNews Editorial

Originally published by Die Zeit in German. Translated, summarized, and contextualized by our editorial team with added local perspective. Read our editorial standards.

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