What happens when the water vapour in the air rises? Try to use the words CONDENSE / CLOUD / RAIN / EVAPORATE

Types of Rain feedback! Frontal rainfall Relief rainfall

Types of rainfall

Air pressure and wind Lesson Objectives: To understand the concept (idea) of air pressure To be able to explain high and low pressure and identify it on a pressure chart Lesson Outcomes: All: will be able explain what we mean by air pressure Most: will be able to explain the difference between high and low pressure Some: will be able to give examples of the type of weather we get during high and low pressure

Air Pressure What’s air pressure? Although we can’t feel it, all the air above us is pressing down on us. If air pressure is LOW, it means air is rising and therefore the water vapour in the air is rising also! sinking If air pressure is HIGH, it means air is _______ Each type of air pressure brings different weather.

Low pressure So the fall in air pressure at A is a sign of rain and wind. The lower the pressure, the worse the weather will be. The metrological term for a LOW pressure is DEPRESSION http://www.curriculumbits.com/prodimages/details/geography/depressions.html

High pressure WHY? So high pressure means clear skies, with no clouds. That’s what gives us our hottest summer and coldest winter weather. The metrological term for a HIGH pressure is ANTICYCLONE

This is what happens when we have HIGH pressure in summer and winter.

B A C What will the weather be like in the following places? A, B and C Can you explain why?

Rainfall and air pressure Lesson Objectives: To be able to draw and interpret a rainfall graph and maps. To understand the concept of air pressure To be able to explain high and low pressure and identify it on a pressure chart Lesson Outcomes: All: will be able to interpret a rainfall graph and map Most: will be able to explain what we mean by air pressure Some: will be able to give examples of the type of weather we get during high and low pressure