Isobars on a weather map- Lee Si Rong

Isobars are lines on a weather map joining together places of equal atmospheric pressure.

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. The numbers measure the atmospheric pressure in millibars.

. Usually isobars are drawn at intervals of two or four millibars (one thousandth of a bar).

. The closer the isobars are together the windier it is.

. If the lowest number is in the middle circle this is a low pressure or depression. Often low pressures mean wet and windy weather.

. If the highest number is in the middle circle, this is a high pressure or anticyclone. Often high pressures mean dry, sunny weather.

. Air pressure tends to range from 890 mb (a hurricane) to 1060 mb (an anticyclone).

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