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The large-scale development shows advection of warm air from short-west in front of a cyclone that developed north of the Azores.
The plot below (a) shows Z500 and lightning density for Europe, using the UK Met Office lightning database. Lightning activity over the Netherlands and northern Germany is quite high. A number of severe weather reports (b; source: ESSL severe weather database) has been collected from the region of the highest lightning activity.
a)
b)
Precipitation totals over Europe from 05 May 06UTC to 06 May 06UTC (data: GTS and EFAS):
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