Hi @helijoc , it's not a bug. We were discussing this issue some time ago: https://community.windy.com/topic/6995/the-forecast-changes-depending-on-the-zoom/2

@thebigmuzzy There is no need to zoom to a level lesser than the model's resolution. e.g. ECMWF has a resolution of 9 km. Do not expect reliable changes in locations less than 9 km apart. Only interpolated values.

https://www.windy.com/es/-Acumulación-de-lluvia-rainAccu?gfs,rainAccu,37.801,-4.142,9,m:eIiaf2N but occurs at any point of Spain Choose 10 days rain accumulation

@LLXC This has been a thing for a while. From what I understand, it is an issue with the interpolation. As you zoom in, the interpolation becomes a slightly higher resolution. I think it is a minor issue and don't think much of it. I've only noticed a difference of one or two units as I zoom in so it's not that big of a deal for me. What I would recommend is zooming in as much as you like to get more accurate forecast readings.