Surf powerboat racers from all over the country have been at Watergate Bay this weekend for the Thundercat National Championships.
The four-metre-long catamarans can reach speeds of up to 60 mph.
It's the second time the national event has been held in Cornwall.
Francesca Carpenter reports on an event that always guarantees high drama:
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A combination of cloud, sunshine and showers. Temperatures rising to 19 C but heavy showers - some of them thundery - are likely later.
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Friday will start with a mix of cloud, sunny spells and showers but those showers will become heavy later with temperatures hitting 19 C