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Still have questions? Isobars on a weather map 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. The wind would be perpendicular to the isobar if the Earth wasn't spherical and rotating around its axis. But instead, all moving objects, including wind, are subject to the influence of the so-called Coriolis force.
It deflects wind from the normal line to a certain angle. In the Northern Hemisphere air is rotated clockwise to the right and in the Southern - counterclockwise to the left with reference to the movement direction.
The friction between air and sea is lower, that's why it's deflected more there. The higher the pressure difference between two areas is, the higher the wind speed is. That's why isobars that are close to one another mean high wind speed. L on the isobar map is a cyclone with a low-pressure area in the circle.
A cyclone means cloudy and rainy weather. H is an anticyclone with a high-pressure area in the circle. Anticyclone means calm and sunny weather. How atmospheric pressure works.
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