The German Weather Service (DWD) in Offenbach predicted severe thunderstorms with a high risk of heavy rain, hail and strong winds from southern Baden-Württemberg to Lower Bavaria and Upper Franconia.
Some places could see hail up to 8 cm, hurricane-force gusts of wind up to 130 km/h and heavy rain of up to 40 litres per square metre in a short time, according to the weather warnings.
The DWD issues torrential rain warnings when more than 25 litres per square metre are expected in an hour. Rain amounting to more than 40 litres per square metre in an hour, as is predicted in places on Wednesday, are classed as extremely severe weather.
As of around 11 a.m. on Wednesday morning, the DWD's weather warning map showed potential thunderstorms over most of the southwestern state of Bavaria, with high wind warnings seen primarily in the Alps along Germany's southern border.
Wind and weather warnings were also in place in small clusters in the middle of the country.
According to the forecast, slightly less severe thunderstorms are also possible from Rhineland-Palatinate and Saarland through Hesse and Thuringia to Saxony-Anhalt, northern Saxony, Brandenburg and Berlin.
These regions may expect squalls, scattered heavy showers and small-grained hail.
With reporting by DPA.
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