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weather map ![click to hear : weather map click to hear : weather map](../../images/speaker-vert.gif)
Map representing atmospheric conditions observed in a region at a given time.
high-pressure center ![click to hear : high-pressure center click to hear : high-pressure center](../../images/speaker-vert.gif)
Zone characterized by relatively high pressure that decreases as a function of the distance from its center.
type of the air mass ![click to hear : type of the air mass click to hear : type of the air mass](../../images/speaker-vert.gif)
Air mass: a vast moving body of air; it takes on the climatic characteristics of the region lying below it.
trough ![click to hear : trough click to hear : trough](../../images/speaker-vert.gif)
Elongated zone in which atmospheric pressure is relatively low.
precipitation area ![click to hear : precipitation area click to hear : precipitation area](../../images/speaker-vert.gif)
Zone in which atmospheric water content condenses and falls from the clouds in liquid or solid form.
low-pressure center ![click to hear : low-pressure center click to hear : low-pressure center](../../images/speaker-vert.gif)
Zone characterized by relatively low pressure that increases as a function of distance from its center.
wind direction and speed ![click to hear : wind direction and speed click to hear : wind direction and speed](../../images/speaker-vert.gif)
barometric pressure ![click to hear : barometric pressure click to hear : barometric pressure](../../images/speaker-vert.gif)
Measurement of the force that air exerts at a given point on the Earth’s surface; it is expressed in millibars.
isobar ![click to hear : isobar click to hear : isobar](../../images/speaker-vert.gif)
Curve connecting the points on the Earth’s surface that have the same atmospheric pressure.