Thanks for the comments. I will continue in english, since it is bit easier to me. There is pressure charts, but the front systems are missing. I will look if it is possible to add those. The data is from SMHI, FMI, EMHI and DWD open data. (I trying to get data from all baltic sea nations)
You can get forecast from any location on map. Just right click on map (or long press on tablet) and select the forecast type you want in that location. I can also add more cities in the menu. Now there is only 500 most populated cities listed in the whole Baltic sea area. Maybe you can give a list which cities should be added?
I couldn't open the viva.se site. The site is "under konstruktion".