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May 15 2026, 00:00–15:00 Nocturnal thunderstorms over Italy
Convection mainly driven by a marked upper-level forcing
⚡ 6,658 flashes detected
⚡ 2,489 cloud-to-ground flashes
A large low-pressure system centered over the North Sea has been driving atmospheric dynamics across most of Europe in recent days.
It extends a particularly deep and elongated talweg, whose axis reaches
down to the North African coasts, creating a highly unstable and convection-favorable environment across Western and Southern Europe. During the first days, thunderstorm activity was concentrated over Western Europe, particularly France and the Iberian Peninsula.
On May 15, the talweg gradually shifts eastward, and convection followed suit, moving towards the Italian Peninsula and the Balkans. It was during the night of May 15 to 16 that the episode peaked over Italy: Meteorage network recorded a high number of lightning flashes. Although intra-cloud flashes remained dominant in absolute terms,
as is almost always the case in thunderstorms, the proportion of
cloud-to-ground flashes was particularly high for this type of event. Moreover, the fact that most of the activity occurred during the night is a signature of this type of episode driven by upper-level dynamics (these dynamics influence the timing and intensity of thunderstorms, but not the distribution between IC and CG flashes).
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