23 terms

Lesson 4 - Air Masses

Water and Atmosphere - Chapter 4 - Weather
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Terms in this set (...)

Air Mass
A huge body of air that has similar temperature, humidity, and air pressure at a any given height
Tropical Air Mass
A warm air mass that forms in the tropics and has low air pressure
Polar Air Mass
A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure
Maritime Air Mass
a humid air mass that forms over oceans
Continental Air Mass
A dry air mass that forms over land
Jet Stream
bands of high-speed winds about 10 kilometers above Earth's surface
Front
The boundary where unlike air masses meet but do not mix
Occulded
Cut off, as in a front where a warm air mass is caught between two cooler air masses
Cyclone
a swirling center of low air pressure
Anticyclone
a high-pressure center of dry air
Maritime polar air masses are ___.
cold and moist
Maritime tropical air masses are ____.
warm and moist
Continental polar air masses are ___.
cold and dry
Continental tropical air masses are ___.
warm ad dry
A stalled front that may bring many days of clouds and precipitation is a ___.
stationary front
Bands of high-speed winds about 10 kilometers above Earth's surface are called ___.
jet streams
A large body of air that has similar temperature, humidity, and air pressure at a given height is called ___.
an air mass
Air masses that form over oceans are called ___ air masses.
maritime
The boundary where air masses meet is a ___.
front
A ____ front occurs when a fast-moving warm air mass overtakes a slower-moving cold air mass.
warm
A swirling center of low pressure is called a ___.
cyclone
___ are high-pressure centers of dry air.
anticyclones
A ___ front occurs when a fast-moving cold air mass runs into a slower warm air mass.
warm