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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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11y ago
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13y ago

Curving lines on a weather map connect locations with the same air pressure

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11y ago

Usually those are isobars - lines of equal barometric pressure.

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7y ago

a curved line on a weather map indicates areas of equal air pressures

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14y ago

isobars lines of equal pressure

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