What are local conditions and how do they affect the weather?

The pressure field determines the direction and speed of the inflow of air masses at all levels of the atmosphere. Air masses, forming over warm or cold, dry or humid areas, bring a particular type of weather. All this is further complicated by processes on weather fronts and the impact of local conditions.

Local conditions have a decisive influence on the type of weather and the course of atmospheric processes when there are no or negligible changes in temperature and humidity caused by the influx of a new air mass. And although there are no "pure" local or advective cases in weather, at least these two factors compete with each other; the type of weather determines the one whose contribution is greater.