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06. Changes In Weather
All extracts courtesy of the MarineCall Guide
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How the movement of atmospheric disturbances affect the weather.

From the following diagram, a disturbance can be seen from above that shows the organisation of the cloud system, with which associated fronts can be seen.

• A long way ahead of a disturbance, there is a veil of high cloud called Cirrostratus (CS) progressively thickening to Altostratus (AS)

• A band of humid air is trapped between the warm front and the cold front. This humidity is evident by low clouds, Stratus (ST) and transforms frequently into fog or mist.

• South of the occlusion continuous rain becomes weaker and less frequent.

• Under the occlusion, it rains heavily.

• With the arrival of the warm front and the occlusion, the clouds are very thick Nimbostratus (NS)

• When the cold front passes through, the change in the air mass is plain to see. The air becomes clearer, it can even clear totally.