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This resource aids in understanding the weather phenomena tied to depressions, using Storm Klaus as a case study. It explains how different air masses interact, describing warm and cold fronts, and visualizes their effects through cross-sectional diagrams. By examining the rise of warm, moist air and the formation of various cloud types such as nimbostratus and cumulonimbus, the material highlights the resultant weather changes including continuous and heavy rainfall. Learners will be equipped to analyze and label key aspects of a depression's structure and associated weather events.
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Starter- can you? Label the area of lowest pressure associated with storm Klaus. Label the cloud produced by the warm conveyor. Label the cloud head produced by the cold conveyor.
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 artic or polar air Warm Sector Warm front Cold Front Tropical area
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 Heavy rain Continuous rainfall Showers Intermittent rain Direction
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.