Raymarine SR100 - Manual (Page 26)

23 Raymarine Sirius Weather System Installation Guide
Glossary of weather terms
Term
Definition
Cold front
The boundary between two different air masses where cold air pushes warm air out of the way and brings colder weather.
Cyclone A large area of low atmospheric pressure, characterized by inward spiralling winds. A “low” also called a “depression”. Also the
name used for a hurricane in the Indian Ocean and Western Pacific.
Depression An area of low pressure. Also called a cyclone.
Dry line A region where there is a strong gradient in dew point temperatures. It is often found in a region where strong thunderstorms develop.
Forecast Something that tells us what the weather is probably going to be like.
Front The boundary between two masses of air with different temperatures (i.e.: a mass of cold air and a mass of warm air).
High Also known as an 'anticyclone' an area of high atmospheric pressure with a system of winds rotating outwards. This usually
means dry weather. It is the opposite of a 'low'.
High Pressure A mass of air that presses down strongly on the surface of the Earth because it is being cooled and is therefore more dense.