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A development or strengthening of cyclonic circulation in the atmosphere. The opposite is CYCLOLYSIS. The term is applied to the development of cyclonic circulation where previously it did not exist, as well as to the intensification of existing cyclonic flow. While cyclogenesis usually occurs with a deepening (a decrease in atmospheric pressure), the two terms should not be used synonymously.



Related Terms

HIGH PRESSURE SYSTEM

An atmospheric circulation rotating anti-clockwise in the Southern Hemisphere, associated with light winds and fine weather.

CYCLOLYSIS

Any weakening of cyclonic circulation in the atmosphere. The opposite is CYCLOGENESIS. While cyclolysis usually occurs with a filling (an increase in atmospheric pressure), the two terms should not be used synonymously.

FILLING

Increase in atmospheric pressure, particularly within a low. Decrease in pressure is called DEEPENING

ZONAL FLOW

Atmospheric circulation following parallels of latitude.

DEEPENING

Decrease in atmospheric pressure, particularly within a low. Increase in pressure is called FILLING.

Pressure

The force exerted by a liquid or gas on a unit area. Three pressures may be involved: gauge pressure, the unit pressure above atmospheric pressure; absolute pressure, gauge pressure plus the atmospheric pressure; vacuum pressure; the pressure below atmospheric pressure usually expressed in inches of Hg.

NATURAL CIRCULATION

The circulation of water in a boiler caused by differences in density; also referred to as thermal or thermally induced circulation.

AIR DRAFT

The difference between atmospheric pressure and some lower pressure existing in the furnace or gas passages of the steam-generating unit.

BOILING TEMPERATURE

The temperature at which a liquid boils. As the boiling temperature rises with an increase in pressure (see saturated vapor pressure), the boiling temperatures are usually given for atmospheric pressure. At this pressure, water boils at +100° C., butane at - 0.5° C., ammonia at - 33° C. and propane at - 43° C.

GAGE PRESSURE

The pressure measured relative to the local atmospheric pressure. Gage pressure may be negative. A negative gage pressure is known as suction or vacuum.

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