Little reference to sequence/likely to describe or explain
e.g. it rains when the fronts pass, it gets warmer in the middle.
Level 2 (3-4 marks)
More idea of sequence and weather, clear statements but likely to be
incomplete, may be unbalanced, e.g. as the warm front passes there is a long period of steady rain, followed by the cold front with heavy rain.
Level 3 (5-6 marks)
Detailed coverage of both description and explanation, e.g. begins with approach of cirrus cloud, cloud base gradually lowers and thickens generating a long period of light rain ahead of the warm front. As the warm front passes temperatures rise and the sky clears due to the presence of the warm sector. As the cold front approaches the cold air undercuts the warm air causing rapid uplift, towering cumulus clouds and a short period of heavy rain due to the steepness of the front ….. 6 marks
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
Q9 (a) (ii) Explain the changes in cloud cover and rainfall as the warm front passes overhead . (4 marks)
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