We’ve all seen the movies of giant tsunami hitting the coast, but how accurate are they? The devastating wave that hit Indonesia in 2004 was caused by a 9.1 earthquake in the Indian ocean.
https://www.theatlantic.com/photo/2014/12/ten-years-since-the-2004-indian-ocean-tsunami/100878/
Could a meteor cause this kind of phenomena? Probably not by itself, but location is key, and the amount of water vapor tossed up into the atmosphere would drastically effect climate.
https://www.space.com/35081-asteroid-impact-ocean-computer-simulations-solar-system.html
https://mashable.com/2018/07/01/nasa-meteorite-pacific-ocean-exploration/#.w4Ht5hh9aq9
https://www.space.com/35081-asteroid-impact-ocean-computer-simulations-solar-system.html