1. Brought to you by: Mr. Anderson
Weather Tools
Brought to you by:
Mr. Anderson

2. Can you think of a tool that is used to measure weather?
What are tools?
Can you think of a tool that is used to measure weather?

3. Thermometer A tool used to measure temperature
How hot or cold it is outside
Thermometers have different scales
We measure in Fahrenheit scale.
The world uses the Celsius scale.

4. Barometer A tool used to measure air pressure
The weight of air pushing on the earth’s atmosphere
If it CHANGES, then new weather is on the way:
Falling Air Pressure = stormy weather coming
Rising Air Pressure = fair weather coming
Steady Air Pressure = no change is coming

5. Hygrometer
A tool used to measure humidity

6. Relative Humidity
Measure of the amount of moisture in the air compared to what the air could hold
How “full” of water the air is
Expressed as %
100% relative humidity = saturated air

7. Relative Humidity Controlled by temperature
1. Warm air holds more moisture than cool air (more space for water vapor between air molecules)
2. As air warms, relative humidity decreases
3. As air cools, relative humidity increases

8. Dew Point
=Temperature at which the air is saturated (100% relative humidity)
Several events can occur when the dew point temp. is reached:
1. If dew point temp. is above freezing:
a. water vapor condenses as liquid
b. dew will form on surfaces

9. Dew Point c. cloud droplets will form in air forming clouds.
2. If dew point temp. is below freezing:
a. water vapor condenses as a solid
b. frost on surfaces
c. snow (or hail) in the air

10. Anemometer A tool used to measure the wind speed
How fast is the wind blowing?
Think: Ants= move fast
Anemometer= how fast wind is moving

11. Wind Vane A tool used to measure the DIRECTION of the wind
The arrow points in the direction from which the wind is blowing
Think: wind vane =
rooster on roof!

12. Rain Gauge A tool used to measure the amount of rainfall
How much rain have we received in during a period off time.

13. Katie wants to measure the amount of moisture in the air
Katie wants to measure the amount of moisture in the air. She does not want the water in the air to disorder her hair. What instrument should she use?

14. Mrs. Hartman plans to go out over the weekend on her new sailboat
Mrs. Hartman plans to go out over the weekend on her new sailboat. First, she must know how fast the wind is blowing to see if it’s appropriate to sail. What instrument should she use?

15. Mrs. Leab wants to make sure that she dresses Baby Joseph correctly when she brings him to visit us. In order for her to know the temperature outside, what instrument should she use?

16. Mr. Snow just bought a brand new kite and he is anxious to fly it
Mr. Snow just bought a brand new kite and he is anxious to fly it. Before he flies it, he must be cognizant of the DIRECTION of the wind. What instrument should he use?

17. A meteorologist observes some cumulonimbus clouds outside
A meteorologist observes some cumulonimbus clouds outside. He speculates that there is LOW air pressure. What instrument should he use to determine the air pressure?

18. Ryan is working on his Science Fair project
Ryan is working on his Science Fair project. He plans to measure the amount of rainfall that has fallen in his neighborhood over the past two weeks. What instrument should he use?