Meterology

Meteorology

The study of movements and phenomena in the earths atmosphere , especially with regard to weather forecasting

Air masses

Mass of air that has similar characteristics

Isobars

Lines which join places of equal pressure

Depression

Region of closed isobars with low pressure on the inside (Circulates anticlockwise in northern hemisphere(

Secondary depression

When a depression is halted, suddenly a wave may form on its trailing edge

Anti-cyclone

High

Warm sector

Area of warm air within a depression

Cold sector

The part of a depression which is distinguished by relatively cold air

Front

A line of separation between cold and warm air masses

Occluded front

When the cold front catches the warm front

Ridge

Area of high pressure which lies between areas of lower pressure

Trough

A valley of low pressure or the opposite of a ridge

Jet streams

Rivers of cold air

Equal

Sudden short lived storms

Advection fog (Sea fog)

When warm moist air flows over a cold sea surface

Radiation fog (Land based)

Occurs during cold clear nights when the land loses the heat it absorbed during the day. The cooler land in turn cools the air in contact with it causes dew to develop.

Frontal fog

Occurs where two masses of different temperatures meet

Arctic fog

Fog caused by extremely cold air passing over warm water

Tropical revolving storms (TRS)

Intense depressions that form in tropical regions

Cirrus

Thin, wispy or feather clouds, at a very high altitude. Prefix to denote high altitude

Cumulus

Clearly outlined heaped clouds

Stratus

Uniform flat sheet of cloud cover

Nimbus

Rain or storm used in conjunction

Alto

Middle level clouds