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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?