QUIZ
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Transcript of QUIZ
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QUIZ 1. List Four types of Air Masses
(symbols are accepted)
2. Name the Three Wind Systems “Zones”
BONUSWhat are JET STREAMS??
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Science NewsScience News
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GLOBAL WIND SYSTEMSGLOBAL WIND SYSTEMS Result of Earth’s rotation & uneven Result of Earth’s rotation & uneven
heating of surfaceheating of surface
Transports colder air to the Equator & Transports colder air to the Equator & warmer air to the Poles warmer air to the Poles
Help to equalize the thermal energy on Help to equalize the thermal energy on EarthEarth
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Forces Influencing Wind Forces Influencing Wind Speed & DirectionSpeed & Direction
Gravitational Force:Gravitational Force: equal compression equal compression density decrease with altitudedensity decrease with altitude
Friction ForceFriction Force:: Earth’s rough surface Earth’s rough surface adds to Pressure & Coriolisadds to Pressure & Coriolis
Coriolis Force:Coriolis Force: Earth’s rotation Earth’s rotation deflecting winddeflecting wind
Pressure Gradient Force:Pressure Gradient Force: High/Low High/Low systemssystems
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Coriolis EffectCoriolis Effect Earth’s rotation Earth’s rotation
breaks air masses breaks air masses into smaller cellsinto smaller cells
Moving air curves Moving air curves to the to the rightright in the in the N. Hemisphere & N. Hemisphere & to the to the left left in the S. in the S. HemisphereHemisphere
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PRESSURE SYSTEMSPRESSURE SYSTEMS Low Pressure systemLow Pressure system air coming air coming
up either cloud cover / up either cloud cover / precipitation or no clouds because precipitation or no clouds because no moistureno moisture
High pressure systemHigh pressure system air coming air coming down generally fair skiesdown generally fair skies
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Pressure DifferencesPressure Differences
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970 mb.950 mb.
930 mb.960 mb.
H L
Wind & Pressure RelationshipWind & Pressure Relationship
WINDSWINDS ALWAYS ALWAYS MOVE FROM MOVE FROM HIGH HIGH PRESSURE AREAS TO PRESSURE AREAS TO LOW LOW PRESSURE AREAS!!!!!!!PRESSURE AREAS!!!!!!!
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Pressure CentersPressure CentersCyclones:Cyclones: centers of centers of low pressure, low pressure, Storm & CloudsStorm & Clouds (L) the pressure (L) the pressure
decreases from decreases from the outer the outer isobars toward isobars toward the centerthe center
Anticyclones: Anticyclones: centers of high centers of high pressure,pressure,
Calm & ClearCalm & Clear (H) the pressure (H) the pressure
increases from increases from the outside the outside toward the toward the centercenter
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CyclonicCyclonic & & AnticyclonicAnticyclonic WindsWinds
AnticyclonesAnticyclones Winds in a high pressure area Winds in a high pressure area
move clockwise (S Hemisphere)move clockwise (S Hemisphere)
CyclonesCyclones Winds in a lower pressure area Winds in a lower pressure area
move counter-clockwise (N move counter-clockwise (N Hemisphere)Hemisphere)
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CYCLONECYCLONE
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ANTICYCLONEANTICYCLONE
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Pressure Centers & Pressure Centers & WindsWinds
Weather and Air PressureWeather and Air Pressure Rising air is associated with cloud Rising air is associated with cloud
formation and precipitation, whereas formation and precipitation, whereas sinking air produces clear skies.sinking air produces clear skies. Weather ForecastingWeather Forecasting
Weather reports emphasize the Weather reports emphasize the locations and possible paths of locations and possible paths of cyclones and anticyclones.cyclones and anticyclones.
Low-pressure centers can produce Low-pressure centers can produce bad weather in any season.bad weather in any season.
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Pressure Systems Pressure Systems CollisionsCollisions
Collision forms a Collision forms a frontfront, , boundary that separates air boundary that separates air masses of different densitiesmasses of different densities
Air masses retain their Air masses retain their identities identities
Warmer, less dense air forced Warmer, less dense air forced aloft aloft
Cooler, denser air acts as Cooler, denser air acts as wedgewedge
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4 Types of Fronts4 Types of Fronts Warm frontWarm front
Warm air replaces cooler airWarm air replaces cooler air•Clouds become lower as Clouds become lower as the front nearsthe front nears
•Slow rate of advance Slow rate of advance •Light-to-moderate Light-to-moderate precipitationprecipitation
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Warm frontWarm front
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Cold FrontsCold Fronts Cold air replaces warm airCold air replaces warm air
• Advances faster than a warm Advances faster than a warm frontfront
• Associated weather is more Associated weather is more violent than a warm front violent than a warm front •Intensity of precipitation is Intensity of precipitation is greatergreater
•Duration of precipitation is Duration of precipitation is shortershorter
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Cold frontCold front
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Stationary frontStationary frontFlow of air on both sides of the front is Flow of air on both sides of the front is
almost parallel to the line of the frontalmost parallel to the line of the front• Surface position of the front does Surface position of the front does not movenot move
Occluded frontOccluded frontActive cold front overtakes a warm Active cold front overtakes a warm frontfront• Precipitation is associated with Precipitation is associated with warm air being forced upwarm air being forced up
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FormatioFormation of an n of an
OccludeOccluded frontd front
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HOMEWORKHOMEWORK
REVIEW TEXT REVIEW TEXT p. 312 – 324p. 312 – 324
& & CH 12 NotesCH 12 Notes