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