The topography as seen by an approaching flow, which may include not only the actual terrain but also cold air masses trapped within or adjacent to the actual topography.
- Browse Related Terms: A AMS, C AMS, CAD, Cold Air Avalanche, Cold Air Dam, Cold Air Damming (CAD), cold front, Continental Air Mass, Effective Topography, Extratropical, front, K AMS, Marine Push, Maritime Air Mass, Maritime Polar Air Mass, Maritime Tropical Air Mass, Orographic Precipitation, Polar Front, Specific Humidity, Upslope Fog, Vortex, Warm front