Rising air is attributable to three main mechanisms: Hailstones can be pulled upward repeatedly, growing larger and larger over time. Vertical wind shear means that rain and the associated cold air do not fall through the updraft, allowing the convection to continue. The updraft areas in convective cells then further pull up the warm, unstable air. In simple terms, thunderstorms occur when warm, moist air rises into cold air above and condenses repeatedly, forming a convective cell. The formation of thunderstorms, along with resulting tornadoes, hail, wind and rain storms, is dependent on a number of factors. Physical Discussion of Meteorological Conditions In some areas, overland flow from bare fields funneled into nearby streets, causing cars to be carried along by the muddy water. Moreover, several municipalities (Linter, Dessel and Gingelom) were hit by small mudflows. In Landen, a railway station had to contend with excess water. In Hansbeke, traffic on the Julius Nieuwlandweg highway was diverted because of flooded tunnels (60 cm).ĭuring the afternoon, a low-pressure thermal system affected Limburg and Flemish-Brabant, and precipitation of up to 60 mm was observed. In Lievegem, some houses–along with sheds, garages and cellars–were flooded up to 2-4 cm. In the rest of the country, smaller return period (20 years and lower) amounts were recorded. This severity corresponds to a return period of 100 years. Throughout the morning, parts of the provinces of West Flanders and East Flanders experienced a squall line and rainfall of up to 95 mm/day or 40 mm/h was recorded. On 5 June, Belgium was impacted by heavy rain. In Hesse, storms flooded some cellars and flats, most notably in Darmstadt and the Darmstadt-Dieburg district. In Aschbach of Rhineland-Palatinate, a storm damaged the roofs of about 20 houses. Trees fell on several cars in Bavaria, but no one was injured. Several rivers, such as the Große Vils, burst their banks, and roads were flooded in Rosenheim, Traunstein, and the district of Erding.Įspecially in southern Germany, the storms caused much damage with falling roof tiles, lightning strikes and flooded cellars. There also was heavy rain in the Bavarian Forest and in Upper Bavaria. The areas around Pforzheim, Mühlacker, Maulbronn and Sternenfels were most affected. There also were reports of fallen trees, but no reports of injuries or major damage.Įnzkreis in Baden-Württemberg received up to 60 mm of precipitation in the form of hail and heavy rain, with several streets flooded within a few minutes. In the Lindau district of Allgäu, roads were covered in a thick layer of hail. On 5 June, severe thunderstorms swept across the south and southwest of Germany. While hail was the dominant driver of these losses, flood and wind damage also contributed. They accumulated to an estimated market loss between EUR 800 million and 900 million. It was reported that Covéa estimated this event to generate 230,000-250,000 motor vehicle and property claims with a market loss between EUR 650 million and 850 million (40% motor, 60% property). ![]() ![]() On Sunday, 5 June, thunderstorms shifted eastward, bringing heavy rainfall and hail damage to some localities in the Alps and the Rhône Valley. Flash floods inundated the city of Rouen in Seine-Maritime, where a woman died. The city of Vichy in Allier was especially affected by hailstones of 7 to 8 cm, sustaining great damage. On 4 June, multiple supercell thunderstorms simultaneously dumped hailstones onto Loire, Puy-de-Dôme, Allier and Creuse. In addition, heavy flash floods occurred in the northwest of the country, especially in the city of Rennes. Then, a supercellular thunderstorm emerged in the southwest over eastern Landes, northern Gers, and southern Lot-et-Garonne, raining large hailstones that exceeded 5 cm in diameter on Friday, 3 June. The disturbance expanded and caused flash flooding in Dordogne on Thursday, 2 June. After a first hail outbreak during 18-23 May, with huge damage in the city of Chateauroux, a broader event developed by the Pentecost weekend and caused damage stretching from southwest to northeast France, associated with a disturbance named Maya by the University of Berlin. From the middle of May to the beginning of June, the meteorological situation was conducive to large-scale thunderstorm events.
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