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