Al sinds vrijdag 25 mei stroomt er warme, vochtige en onstabiele lucht over Nederland die wordt aangevoerd over de noordflank van een lagedrukgebied dat boven Europa rondtolt. Dat zorgt de afgelopen week bijna elke dag voor steeds nieuwe onweersbuien met hevige regenval, bliksem en hagel.

A level 1 was issued for part of W and CNTRL Europe mainly for large hail, severe wind gusts and in lesser extent for excessive precipitation.

A level 2 was issued for parts of CNTRL Germany, S-Czech Republic and E-Austria mainly for a few discrete supercells with large/very large hail, severe wind gusts, heavy rain and an isolated tornado event. A level 1 surrounds the level 2 mainly for large hail and severe wind gusts next to locally excessive rain.