COLD AIR DEVELOPMENT

written by ZAMG

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CLOUD STRUCTURE IN SATELLITE IMAGE

METEOROLOGICAL PHYSICAL BACKGROUND

KEY PARAMETERS

WEATHER EVENTS

TYPICAL APPEARANCE IN VERTICAL CROSS SECTION

LEVELS IN SATREP, KEY PARAMETERS AND REFERENCES

COMMON REMARKS

The mature stage of cold air developments are represented by a distinct cloud spiral but without any warm front cloudiness, this is the main difference to the classical occlusion types (compare also chapters OCCLUSION: WARM CONVEYOR BELT TYPE

and OCCLUSION: COLD CONVEYOR BELT TYPE

) and is caused by a completely different development. While the classical occlusion types are frontal developments, is the inital stage a non-frontal comma cloud in the cold air (compare also chapter COMMA

In connection with commas the development of polar lows are a common phenomena especially in high latitudes. But the conceptual model polar low differs from the conceptual model cold air development as in the polar low situation the low with a mesoscale comma develops, while in the cold air development situation frontal conditions develop leading to an increase of the scale of the cloud spiral.

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