Answer to Question #135706 in Physical geography for Selam

Question #135706
hi, i am learning about hazardous earth. I am quite confused as to why the centre of a cyclone (the eye) has low pressure when it is clear and still. Should it not have high pressure. This would so much to me if you could answer please. Thank you :)
1
Expert's answer
2020-09-30T15:51:27-0400

First, wind blows from the regions of high pressure into regions of low pressure.


Why do we see water vapor on the external regions of the cyclone? Because the speed of rotation in these regions is so small that water molecules can attach to small pieces of dust (nuclei, more that 1 micrometer in radius) and form droplets - many molecules of water attached to the nuclei. A large number of droplets (the size of a droplet is 0.02 mm) forms what we call clouds.


The clouds on the external regions of the cyclone never reach the center because the Coriolis force deflects the air masses moving to the center.

Thanks to the Coriolis force, the center "slips" away from the external clouds and results in calm weather and clear sky.


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