Objectives Be able to describe and explain the

Objectives  Be able to describe and explain the

Objectives Be able to describe and explain the type of weather associated with the different fronts in a depression. Be able to describe how the weather changes with the passage of a depression. Be able to reproduce a diagram of a cross-section of a depression. The different types of air Cold arctic or polar air

Cold Front Warm Sector Tropical area Warm front Cross-section through depression Klaus

Warm Sector Cold Air Cold Air Direction Cross-section through the depression Cumulonimbus

Cirrus Warm Sector 2 1 Cold

Warm Cold Nimbostratus Showers Heavy rain Intermittent rain

Direction Continuous rainfall As the warm air meets the cold air it is forced to rise, as it is less dense. As it rises moisture within the air cools, condenses and forms clouds. Clouds are found along the warm front. Where the front is high in the sky we

get cirrus clouds, and where its lower we see nimbostratus. If the warm front is near the ground, we can expect continuous rainfall. As the cold air pushes forward, it forces the warm air to rise as it is less dense. As it rises moisture within the air cools, condenses and forms clouds. The uplift caused by the cold air is

much more violent than at the warm front. Towering cumulonimbus clouds are formed. Along the cold front we can expect heavy rain, and sometimes thunder and lightening.

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