[9][10] This airmass from the Mediterranean as well as Morocco and Sahara,[11] saw temperatures reach up to 38 °C[12] and cause very high instability with Mixed Layer CAPE values exceeding 3000 J/kg.

[13] Over the weekend before Pentecost temperatures reached a new level for the first ten days of June and monthly records were broken in some areas of eastern France and southwestern Germany.

[15] With the French regions from the Pyrenees to the Paris Basin and on to Belgium seeing high temperatures, while warm air moved into the east of France and into Germany from the south.

[16] Marisol Touraine, the French Minister of Social Affairs and Health activated the public information system in response to the heatwave.

The supercells over northern France from the previous day moved into the BeNeLux states during the overnight hours, continuing to produce large hail and strong winds.

One supercell in particular would pass directly over Paris while producing very large hail up to 10 cm in diameter, causing significant damage in the city.

[23] By 1 pm, the northern France MCS had already reached the Netherlands, and its outflow boundary caused new hail-producing supercells to form in Northrhine-Westfalia.

As time approached evening, the former discrete supercells over France had reached Belgium, where they grew upscale into a strong line of severe thunderstorms roughly 170 km (105 mi) long.

[24] By 9 pm, the MCS had developed into a violent bow echo and moved across the Rhine-Ruhr metropolitan region with hurricane-force winds affecting roughly 10 million people.

[5] All 6 fatalities from this outbreak were a result of the intense bow echo, and the cost of damage was estimated at 650 million euros, just from this single event.

However it would continue to produce strong and partly severe winds until crossing the border into Poland the following morning, where it finally dissipated.

While being significantly weaker, this system would produce some more damage as it moved over the previous bow echo's path, before dissipating in northern Germany at around 9 am.

The trough responsible for the outbreak was forced to move northward on June 10 due to a new low pressure system pushing in from the Atlantic.

As a result, the jet with the strongest windshear was no longer overlapping with the highest instability, and the environment was overall less favourable for severe weather compared to the previous two days.

Meanwhile, the frontal zone of the trough had almost reached the Alps, effectively cutting off the flow of hot and moist air into western and central Europe.

Still, a large pocket of instability remained over eastern Germany, western Poland and parts of Czechia, where thunderstorm activity would focus on the last day of the outbreak.