Absolute Humidity:  A type of humidity that considers the mass of water vapor present per unit volum . . .
Absolute Instability:  When the lapse rate of a column of air is greater than the dry adiabatic lapse r . . .
Absolute Temperature Scale:  A temperature scale with a freezing poin . . .
Absolute Zero:  Considered to be the point at which theoretically no molecular activity exists o . . .
Absorption:  The process in which incident radiant energy is retained by a substance. The abs . . .
Abyssal Plain:  The flat, gently sloping or nearly level region of the sea floor. . . .
Adiabatic Process:  A thermodynamic change of state in a system in which there is no transfer of hea . . .
Advection:  The horizontal transfer of any property in the atmosphere by the movement of air . . .
Advection Fog:  Fog that develops when warm moist air moves over a colder surface, cooling that . . .
Advisory:  Statements that are issued by the National Weather Service for probable weather . . .
Afos:  Acronym for Automation of Field Operations and Services. It is the computer syst . . .
Air:  This is considered the mixture of gases that make up the earth's atmosphere. The . . .
Air Mass:  An extensive body of air throughout which the horizontal temperature and moistur . . .
Air Mass Thunderstorm:  A thunderstorm that is produced by conve . . .
Air Pollution:  The soiling of the atmosphere by contaminants to the point that may cause injury . . .
Air Quality Standards:  The maximum level which will be permitte . . .
Alaskan Winds:  The downslope air flow that blows through the Alaskan valleys. It is usually giv . . .
Albedo:  The ratio of the amount of radiation reflected from an object's surface compared . . .
Alberta Clipper:  A fast moving, snow-producing weather system that originates in the lee of the C . . .
Aleutian Low:  A semi-permanent, subpolar area of low pressure located in the Gulf of Alaska ne . . .