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Organised cloudiness in the thickness ridge in front of a Cold Front which can be extremely convective in unstable situations.

Low and middle level cloudiness develops at the windward side of mountains if the wind streams almost perpendicularly to the mountain barrier.

One typical occurence of Cbs and Mesoscale Convective Systems is within the area of hot air over Spain, in front of an approaching Cold Front.

Secondary Low Centres are small scale cloud vortices which develop within already mature Occlusion cloud bands.

Unstructured patches of low cloud within a stable stratified troposphere.

Development of thermally driven circulation between sea and land, often resulting in organized convective cloudiness in the vicinity of coastlines.

Rapid Cyclogenesis describes a very fast and intensive development of an Occlusion cloud spiral from a low level cloud head. Upper air processes are driving…

Polar Lows look very similar to Commas but usually occur in northern latitudes. They develop under more specific synoptic conditions when compared to the…