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Unit 9: Weather Patterns

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Air mass
a huge body of air that has similar temperature, humidity, and air pressure at any given height
Cyclone
a swirling center of low air pressure
Anticyclone
A high-pressure center of dry air
Front
the boundary where unlike air masses meet but do not mix
Jet Streams
bands of high speed winds above 10 kilometers above Earth's surface
Occluded
cut off, as in a front where a warm air mass is caught between two cooler air masses
Tropical
Warm air masses that form in tropics and have low air pressure
Polar
cold, high pressure air masses that form north of 50〫north latitude or south of 50〫latitude
Maritime
humid air masses that form over oceans
Continental
drier air masses that form over land
Prevailing westerlies and jet streams
move air masses from west to east
West to east
Direction of air masses
Warm front
A warm air mass overtakes a cold air mass
Cold front
a cold air mass overtakes a warm air mass
Occluded front
a warm air mass is caught between two cooler masses
Stationary front
warm air mass and cold air mass meet "head on"
thunderstorms, shift in wind, lower temperature
Type of weather with a cold front
Precipitation, clouds, warm, humid
Type of weather with a warm front
Clouds, rain, snow
Type of weather with an occluded front
Clouds and precipitation
type of weather with a stationary front
rate= distance/time
Formula for rate
Cirrus
warm fronts have what kind of clouds?
Cumulonimbus
cold fronts have what kind of clouds?
low
Is a cyclone low or high air pressure?
High
is an anticyclone low or high air pressure?
Counterclockwise
which direction do the winds in a cyclone move?
Clockwise
which direction do the winds in an anticyclone move?