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Weather Instruments

Weather Instruments. Weather Instruments. Used to measure the 5 major parts of weather observation 1. Atmospheric pressure 2. Humidity 3. Precipitation 4. Wind 5. Temperature. Tools: Atmospheric Pressure. Barometer: Measures air pressure, millibars or inches of mercury. Tools: Humidity.

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Weather Instruments

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  1. Weather Instruments

  2. Weather Instruments • Used to measure the 5 major parts of weather observation 1. Atmospheric pressure 2. Humidity 3. Precipitation 4. Wind 5. Temperature

  3. Tools: Atmospheric Pressure • Barometer: • Measures air pressure, millibars or inches of mercury

  4. Tools: Humidity • Hair Hygrometer: • Uses hair to measure humidity, hair expands and contracts in response to water vapor content in the air. • (Sling) Psychrometer: • Difference between wet bulb and dry bulb used to determine relative humidity.

  5. Tools: Precipitation • Rain Gauge: • Simple funnel with marks associated with units: cm or in. • Tipping Bucket: • Counts the number of times the bucket fills and tips to determine rain fall or snow fall amounts.

  6. Tools: Temperatureº C or º F • Bi-metal: Made of two types of metal. Each metal contracts and expands at different temperatures. • Liquid: Usually uses alcohol. Some used mercury. Liquid contracts and expands in the glass tube. • Electrical: The resistance in the electric current is measured • Thermograph: Measures the progression of temperature over a period of time

  7. Tools: Wind • Anemometer – Wind Speed • km per hour • mi per hour • Wind Vane – Wind Direction • Cardinal units or numerical

  8. Measuring Upper-Atmospheric Conditions • Radiosonde: • Carried aloft by a helium balloon. • Measures upper-atm. conditions: Relative humidity, air pressure, air temperature. • Information sent back to scientists via radio… waves.

  9. Radar • Radio Dish Array: Emits and receives “bounced back” radio waves from larger particles in the atmosphere. • Doppler: • Enhanced version of standard radar. • Detects subtle shifts of movement in all the particles in the atmosphere. • Can determine the size of particles allowing • scientists to “see” the particles approaching.

  10. Not weather satellites, but still cool Satellites • Carry cameras • Upper level Cloud speed, direct. • Hurricane observation • Infrared reading of cloud tops

  11. Computers • Not as good as people but helpful! • Compiles information quickly • Create weather maps 100’s of times faster than people.

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