On the third day of HaxoGreen 2012, Saturday evening, there was a thunderstorm approaching.
Being complete camping greenhorns we all held on to the hacker tent so that it does not fly away. This is strongly advised against. Do not try to save equipment during thunderstorms!
Check out first person view impressions of the cataclysm.
The Storm did some damage you can see on the website of the Centre d’Intervention Dudelange
Here is a image from the Wideumont radar in Belgium, created by Luca Mathias, he estimated the wind speed at 90km/h.
Haxogreen suffered some damage, a participant’s tent got destroyed by a tree.