Geography - Book 2

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A depressions is a center of low pressure (1017mb). In the northern hemisphere, winds spiral into a depression in an anti clockwise action. (winds blow from high to low pressure) The air pressure is shown on the map using isobars. the closer the iso bars the stronger the winds. Depressions where warm air, from the tropics meets air from the poles. depressions always have frontal systems. A Front is the boundaries between cold and warm air.

Depressions with their frontal systems at about 40kp/h  usually  from west or south west to east…




quite detailed

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