@idefix37 is maybe reason, becauase Adriatic sea is more hot then land?

That is the trouble, why I will need to read a book. Because I told that pressure is connected with temperature, but how I see it's not true. I will try this book. Thanks.

I see that I do not understand the difference between cold front and border between high and low pressure, which is normally on 1013 hPa or geopotential high. Last week we had in Slovenia rain in high pressure area, because cold front was crossing. So cold front in high pressure area and high geopotential high. Is there any book or something similar, where I can study this?

@idefix37 is maybe reason, becauase Adriatic sea is more hot then land?

Can someone explain me, why we have rain in high pressure system in Slovenia? Is this normal? We have 3 days rain and all 3 days high pressure.