a. Air is more dense b. Associated with cold air (more dense than warm air) c. Associated with sinking air
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1 Meteorology
2 1. Air pressure the weight of air pressing down on Earth 2. Temperature and altitude determine air pressure 3. The more air particles are present, the more air density or pressure exists 4. The less air particles are present, the less air density or pressure exists A. Air Pressure
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4 A. Air Pressure 5. High Pressure a. Air is more dense b. Associated with cold air (more dense than warm air) c. Associated with sinking air 6. Low Pressure a. Air is less dense b. Associated with warm air (less dense than cold air) c. Associated with rising air 7. Warm air rises, cold air sinks 8. Air cools as it rises
5 9. Air pressure is measured using a tool called a barometer 10. Winds are formed when air from a high pressure (more dense) moves to areas of low pressure (less dense) A. Air Pressure
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7 1. Air mass large mass of air that takes on the temperature and moisture characteristics of the surface below it 2. Air moves from an area of high pressure (more dense) to areas of lower pressure (less dense) B. Air Mass
8 3. A high pressure system a. Rotating mass of cool, dry air rotating in a downward clockwise motion b. Creates sunny and pleasant weather 4. A low pressure system a. Rotating mass of warm, moist air rotating an upward counterclockwise motion b. Creates stormy, windy weather B. Air Mass
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10 5. Air masses are classified by their temperature and humidity (moist or dry) 6. Air masses in the US move west to east B. Air Mass
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12 Low pressure = warm air, less dense, rises High pressure = cool air, more dense, sinks
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19 1. There are 4 major air masses that effect the weather in North America a. Continental polar (cp) b. Continental tropical (ct) c. Maritime polar (mp) d. Maritime tropical (mt) 2. Most weather occurs along the border of these air masses at boundaries called fronts C. Fronts
20 3. Cold front a. Occurs when a cold air mass overtakes a warm air mass b. This pushes the warm air mass upward c. Creates severe weather lasting a short period of time d. Represented by blue triangles on a weather map C. Fronts
21 4. Warm Front a. Occurs when a warm air mass slides up and over a cold air mass b. This creates rainy weather that lasts for several days c. Represented by red semicircles on a weather map C. Fronts
22 5. Stationary Front a. Occurs when a cold and warm air mass meet but do not move in either direction b. This creates sluggish winds and precipitation c. Represented by alternating blue triangles and red semicircles C. Fronts
23 6. Occluded front a. Occurs when two cold air masses merge and force warmer air between them to rise b. This creates high winds and heavy precipitations c. Represented by purple alternating triangles and semicircles
24 1. Cloud a visible mass of condense water in the atmosphere made up of mixtures of tiny droplets of water or tiny crystals of ice 2. Form when water evaporates from Earth s surface 3. Classified according to shape and altitude D. Clouds
25 4. Prefixes: a. Cirro describes high clouds (above 6000m) b. Alto describes middle clouds (between 2000m and 6000m) c. Strato describes low clouds (below 2000m) D. Clouds
26 1. Cirrus a. High, white feathery cloud b. Usually associated with fair weather 2. Cumulus a. Thick, puffy masses b. Usually associated with fair weather E. Types of Clouds
27 3. Stratus a. Occurs in layers and often cover the whole sky b. Usually associated with fair weather 4. Nimbus a. Dark, grey clouds with ragged edges b. Associated with precipitation E. Types of Clouds
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29 1. Cold front cumulonimbus clouds are large puffy rain clouds associated with severe thunderstorms along a cold front 2. Warm front cirrus, stratus, and nimbostratus clouds are associated with the passing of a warm front F. Fronts and Clouds
30 1. Humidity the amount of water vapor in the air 2. Relative humidity ratio of water vapor in a volume of air relative to how much water vapor that volume of air is capable of holding a. Warm air is capable of holding more moisture than cool air G. Water Vapor
31 b. If you increased the temperature of a room without adding more moisture, the relative humidity of the room would decrease c. Relative humidity is expressed as a percentage d. Measured by a hygrometer G. Water Vapor
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33 3. Saturation point at which the air holds as much water vapor as it possibly can a. Warm saturated air contains more water vapor than cold saturated air 4. Dew point temperature to which air must be cooled at the same pressure to reach saturation a. If the same air continued to cool past the dew point, the air s excess water vapor would condense to lead to precipitation G. Water Vapor
34 5. Condensation (gas to a liquid) occurs only when air is saturated a. This leads to precipitation (rain, snow, freezing rain (glaze), sleet, hail) 6. Saturation, relative humidity, and dew point are used to measure humidity G. Water Vapor
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