Cyclones and anticyclones

In the atmosphere, there are two basic types of pressure systems: cyclones and anticyclones.

Cyclone - Atmospheric disturbance with low air pressure (the minimum pressure in the center) and the air circulation around the center counterclockwise in the Northern Hemisphere and clockwise in the southern.

Anticyclone - An area of ​​high air pressure to the maximum pressure in the center and an air circulating clockwise.

Cyclones, in general, bring cloudy weather with precipitation, strong winds, summer thunderstorms. In summer anticyclones prevails overcast weather with good visibility in the winter - a cloudless weather or thin stratus clouds, fog, light winds.

There are intermediate pressure systems: trough, ridge and saddle.

Hollow - Band of low pressure, in the form of an elongated trough the center of the cyclone.

Comb - Band of high pressure extended from the center of the anticyclone.

Col - Barometric region between the two cyclones and two anticyclones arranged crosswise.

In the hollows weather generally has a cyclonic nature and crests - anticyclonic. In the saddle winds usually weak, often foggy. In the summer, the day developing cumulonimbus clouds and local thunderstorms.

Typhoon - The local name for tropical cyclones occur in the South China Sea and the Philippine Islands and in the ocean east of the Philippines to about. Guam. Typhoons are different from cyclones of temperate latitudes smaller size but very high intensity of the phenomena caused by them

weather (strong winds, reaching 60-70 m / sec, torrential rainfall, strong thunderstorms). The pressure in the center of the typhoon is reduced to 960-970 mb (720- 728 mm Hg. Art.). The above weather phenomena caused by typhoons, pose a great danger to flight.

Aeronautical meteorology