1. Weather Instruments

2. Meteorologists use instruments to measure the properties of air.
Air has
Temperature
Precipitation
Humidity
Pressure
Wind

3. Barometer Scientists use barometers to measure air pressure.
The mass of air pressing down on us is 14.7
pounds/square inch
When air pressure is high, the day is clear. Low air pressure means bad weather.

4. Aneroid Barometer Cell volume gets smaller as pressure increases
Most common
for home use

5. How do these barometers work?

7. 72 Hour Barometer (inches)

9. Isobars (lines of constant pressure) on an air pressure map.

10. Psychrometer
To measure relative humidity scientists use a psychrometer.
There are digital and sling psychrometers.
Psychrometers and hygrometers measure relative humidity and dew point.

12. The number where the two measurements
connect is the relative humidity. It is read
in terms of %.

13. Thermometer Thermometers are used to measure temperature.
Temperature is measured
in degrees.
The scale used is Celsius
or Farenheit.

14. Types of Thermometers

15. Anemometer An anemometer is used to measure wind speed
Air speed scale is written
in miles/hour.
Anemometer

16. How do these anemometers work?

17. Wind Vane The wind vane tells the direction the wind is coming from.
Direction is read N, S, E, W, NE, NW, SE, SW.
Wind speed and direction are usually read together.

18. Rain Gauge
The amount of rain is measured in inches.

19. Doppler Radar

20. NEXRAD New and improved Doppler radar system
NEXRAD (acronym) for NEXt generation RADar
Can “see” into thunderstorms to determine rain drops and wind rotation for possible tornado.

22. Weather Stations

24. The meteorologist brings it all together.

25. Show What You Know!

26. 1. Name the instrument, what it measures, and its scale.

27. 2. Name the instrument,property measured, and scale.

28. 3. Name the instrument,property measured, and scale.

29. 4. Name the instrument,property measured, and scale.

30. 5. Name the instrument,property measured, and scale.

31. 6. Name the instrument,property measured, and scale.

32. 1. Name the instrument, what it measures, and its scale.
Barometer
Air pressure
Isobars

33. 2. Name the instrument,property measured, and scale.
Wind vane
Wind direction
North, south, east, west, NE,NW.SE,SW

34. 3. Name the instrument,property measured, and scale.
Hygrometer or psychrometer
Humidity %

35. 4. Name the instrument,property measured, and scale.
Anemometer
Wind speed
Miles/hour

36. 5. Name the instrument,property measured, and scale.
Rain gauge
Precipitation
Inches

37. 6. Name the instrument,property measured, and scale.
Thermometer
Air temperature
Degrees Celsius
or Fahrenheit

38. 7. Instrument, measuring?
Doppler
Storm data

39. What kind of meteorologist are you?

40. Resources http://www.wildwildweather.com/radar.htm