From The weather Vane Wiki
Advection- The movement of atmospheric conditions from one location to another solely based on wind direction, pressure gradients, and availability of a source of sufficiently warm air, cold air, and/or deep moisture. Warm air, cold air and moisture advection are all examples.
After frontal passage, a given location experiences post-frontal cold or warm advection, that is, the advection of progressively cooler or warmer air values with time. Moisture advection ahead of advancing low pressure systems entails the progressive entrainment of higher dewpoint values not only at the surface boundary layer, but also at other pressure surfaces located at higher altitudes within the atmosphere.