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

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?

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.

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

Hygrometer A tool used to measure humidity

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

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

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

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

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

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!

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

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?

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?

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?

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?

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?

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?