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?

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