Meteotsunami

https://www.thesun.co.uk/news/6795390/majorca-menorca-mini-tsunami-wave-beach-tourists/

Citando:
"A meteotsunami is generated when rapid changes in atmospheric pressure cause the displacement of a body of water.

It often emerges as the forerunner of a thunderstorm and a cold weather front.

Meteorologists speak of an inversion when the air on the ground is cooler than in the upper air layers, which then changes the air pressure causing the meteotsunami together with strong gusts.

Meteotsunamis have also been recorded in the United Kingdom. The first ever officially identified British meteotsunami hit the Cornish coastline in June 2011.
British researchers first became aware of the meteotsunami after people walking across St Michael’s Mount causeway suddenly found themselves standing in water."