For the purpose of a story, I'm having an additional island in the North Sea. The island is where the Doggerbank used to be, but a bit larger. The highest "mountaintops" are around 1000m, but a lot of the country is between 1-50 meters above sea level. The island has two mountain ranges. The land usage is mostly agricultural areas, with some larger forrest areas, and several swamp areas. I've provided maps below (except for the land usage) for better visualization.
My question is, how would such an island influence the weather/local climate/tides? My guesses:
- the mountianranges would probably influence the winds/rainfall considerably, so dryer climates/less rain in Denmark and Germany's north?
- With spaces between lands much narrowed down, tidal heights would drastically increase, more to what can be seen in the English Channel?
- the existing Dutch and German islands might be influenced in their existence, as they are sand islands
- On the new island itself, the lowlands would get a lot of rainfall, while the area behind the mountains would be dry
- Weather systems would probably take a different course altogether, but I have no idea what that would look like
Is this plausible, or would the changes be different?
EDIT: Added natural currents imposed over new island
EDIT 2: Based on the comment, I also add this question: What do you think is a sustainable island size that wouldn't cause total havoc? Reducing it by half, splitting it up into several islands?