Clouds block LOS to everything except huge based models.
Clouds provide concealment to models completely within a single cloud effect. If there are two clouds partially overlapping, and a model is standing such that it is fully within both clouds but not fully within either cloud, it does not get concealment.
Clouds are not technically terrain and so are not sub-categorised in Category: Terrain creation. (Well, actually Dense Fog and Burning Earth are terrain types, but for the sake of my categorising sanity I'm ignoring that fact.)
This category has the following 32 subcategories, out of 32 total.
Pages in category "Cloud"
This category contains only the following page.