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Chapter 6 vocab
Air Pressure and Winds
24
Meteorology
Undergraduate 2
04/04/2011

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Term
Air Pressure
Definition
simply the pressure exerted by the weight of air above
Term
Newton
Definition
to measure atmospheric pressure, we use this unit of force from the science of physics
Term
Millibar
Definition
100 newtons per square meter
Term
Mercury barometer
Definition
Term
Aneroid berometer
Definition
with out liquid
Term
Barograph
Definition
provides a continuous record of pressure changes with the passage of time
Term
High Pressure
Definition
High barometric pressure
Term
Low Pressure
Definition
Low barometric pressure
Term
Convergence
Definition
there is a net flow of air into a region
Term
Divergence
Definition
regions where there is a net outflow of air; pressure drops
Term
Wind
Definition
far more air is involved in horizontal movement
Term
Isobars
Definition
lines connecting places of equal pressure
Term
Pressure gradient
Definition
the amount of pressure change occurring over a given distance
Term
Hydrostatic equilibrium
Definition
the important balance that is usually maintained between these two opposing forces
Term
Coriolis force
Definition
deviation is the result of Earth's rotation
Term
Geostrophic winds
Definition
flow in a straight path, parallel to the isobars with velocities proportional to the pressure-gradient force
Term
Buys Ballot's law
Definition
In the Northern Hemisphere if you stand with your back to the wind, low pressure will be found to your left and high pressure to your right
Term
Gradient winds
Definition
winds that blow at a constant speed parallel to curved isobars
Term
Cyclonic flow
Definition
counterclockwise in the NH and clockwise in the SH
Term
cyclones
Definition
Centers of low pressure
Term
Anticyclones
Definition
Centers of high pressure
Term
Pressure tendency
Definition
useful in short-range weather prediction
Term
Wind Vane
Definition
commonly used to determine wind direction
Term
Prevailing wind
Definition
when the wind consistently blows more often from one direction than from any other
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