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They are isobars: Places of equal air pressure. Air pressure then tells you the speed and properties of wind. The closer together the isobars, the stronger the winds. You can tell what direction the winds are by looking at the high and low pressure cells, in the Southern Hemisphere wind travels anti clockwise around high pressure systems, and clockwise around low pressure systems. If the wind is coming onshore, the wind will be moist. If it is coming over dry land it will be dry, and probably hot, for example if your on the east coast of Australia and the wind is a westerly (traveling from west to east across the hot dry desert) it can be assumed that this wind will bring hot and dry conditions to those areas along the east coast.

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