2. Depressions

Depressions have an important influence on UK weather . AQA Geog A Textbook page 57 - 59

A depression…. ,[object Object],[object Object],[object Object],[object Object],[object Object]

Centre of the depression Warm front Warm sector Cold front

How a depression forms…. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Weather associated with depressions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plenary ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

Exam Questions AQA A 2006 Q9A Possible labels – centre of low pressure dense patch of cloud thick cloud shower clouds Scattered clouds Warm sector anticlockwise movement clear sky swirl (of cloud).

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Q 9 (a) (i) On Figure 17 , mark with an arrow and label: the centre of the low pressure the cold front the pressure along isobar X . 3 × 1 for identifying the centre of the low (L) . within 984, the cold front (WF) and the value of the isobar . 1008. x

[object Object],Should refer to increasing amount of cloud; layer / stratus cloud type; due to warm air rising over cold air. This cools as it rises. Condensation occurs at increasingly low levels creating layers of cloud. Prolonged rain; light rain; due to low level cloud formation Air can no longer hold increasing moisture and rainfall results. 4 marks Level 1 (1-2 marks) Basic statements in a random order will emphasise description e.g. it will get cloudy and rain. Level 2 (3-4 marks) Clear, more precise statements recognising passage of warm front; explanation will dominate e.g. stratus cloud will increase due to warm air rising over cold air at the warm front. As this continues, light rain will result as the air can hold no further moisture and there will be a fairly long period of light rain

2. Depressions

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2. Depressions