weather instruments 24-3. lower-atmospheric conditions can change a lot in a day magnitude and speed...
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WEATHER INSTRUMENTS
24-3
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Lower-Atmospheric Conditions
Can change a lot in a day
Magnitude and speed of changes to make predictions
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Air Temperature
Thermometer – measures and indicates temperature
Liquid – mercury or alcohol
Heat causes expansion = rise in sealed tube
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Galileo Thermometer
Weight of each tag is slightly different from the others.
Bubbles are calibrated by adding a certain amount of fluid to them so that they have the exact same density.
Each differs very slightly in density
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Electric thermometer
Temperature rises – current increases through devise
Thermistor – responds very quickly to temperature change
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Air Pressure
Approach of a front usually indicates a drop in air pressure
Barometer
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Wind Speed
Anemometer – measures wind speed
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Wind Direction
Wind vane
16 compass directions
Degrees in a circle
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Upper-Atmospheric Conditions
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Radiosonde
Helium filled weather balloon
Measures:HumidityAir PressureTemperature
Radio waves transmit info
Eventually expands and bursts
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Radar
RAdioDetectionAndRanging
Velocity of objects
Location
Reflected radio waves
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Weather Satellites
Provides information of areas when ground observations cannot be made
Infrared energy at night
Temperature of ocean water – currents or waves
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Computers
Process lots of information
Weather programs
Store past information