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Weather patterns 24 5
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Weather patterns 24 5

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    Weather patterns 24 5 Weather patterns 24 5 Presentation Transcript

    • Weather Patterns 24.5 Air Masses Fronts Storms
    • Air Mass
      • A large body of air with uniform Properties
        • Temp—Moisture—Altitude
      • Can cover large portions of continent
    • What Influences Air Masses?
      • Influenced by region
        • Ex. Gulf of Mexico = Moist hot weather
        • Ex. NW Canada = Cold dry weather
    • What Influences Air Masses?
      • Where does it form:
        • Over water = moisture
        • Over land = dry
        • Latitude = polar = cold
        • Latitude = tropical / equator = warm
    •  
    • Fronts
      • Boundary between two air masses
      • Air masses move because the Jet stream pushes air masses
      • Cold Front: when a cold air mass moves over a warm air mass
    • Warm Front:
      • when a warm-air mass over takes a cold dry air mass
    • Fronts
      • Stationary Front: when two fronts overrun each other and it stays…
        • no movement
    • Front
      • Occluded Front: when a warm front is caught between two cold fronts/masses
    •  
    • Low and High pressure systems
      • Cyclones have a center of low air pressure. They circulate counterclockwise.
        • They are associated with clouds, precipitation and storms.
      • Anticyclones have a swirling center of high air pressure
        • They are associated with clear skies and calm conditions
    • Storms
      • Thunderstorm includes
      • thunder and lightening
        • Form when air rises in
        • a cumulonimbus cloud
      • Tornado is an intense
      • windstorm in a rotating
      • column of air that touches
      • the ground
    • Hurricane is a large tropical cyclone with at least 74 mph winds Hurricane Katrina – Aug. 2005
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    • Predicting weather 24-6
    • Weather Forecasting
      • Meteorologists are scientists who study weather
      • Doppler Radar uses Doppler effect to bounce waves off of precipitation in the atmosphere.
      • Weather stations use instruments to gather weather information.
      • Computers compile and analyze weather data to help predict forecasts
    • Weather Maps
      • They show predicted temps and indicate cloud cover, precipitation and fronts
      • Isotherm is a line on a map that connect points of equal temperatures
      • Isobar is
      • a line that
      • connects
      • points of
      • equal air
      • pressure