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8/10/2019 Unit 3 Lesson
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Unit 3 Lesson 3 How Do We Measure Weather?
Copyright Houghton Mifflin Harcourt Publishing Company
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Unit 3Lesson 3 How Do We Measure Weather?
Whats the Weather Like?
Copyright Houghton Mifflin Harcourt Publishing Company
Weatheris what the atmosphere is like at a giventime and place.
Meteorologists are scientists who study weather.
Factors such as air temperature, amount of cloudcover, and amount of precipitation are used tocreate weather reports.
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Unit 3Lesson 3 How Do We Measure Weather?
Whats the Weather Like?
Copyright Houghton Mifflin Harcourt Publishing Company
Weather reports can help you plan your day.
Airports use weather reports to plan flight
schedules.
Farmers use weather reports to help care for theircrops.
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Unit 3Lesson 3 How Do We Measure Weather?
Watching the Weather
Copyright Houghton Mifflin Harcourt Publishing Company
Weather balloons are used to carry weather toolshigh into the atmosphere.
Awind vane
measures wind direction by pointingin the direction from which the wind blows.
An anemometermeasures wind speed. Windspeed is measured in kilometers per hour.
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Unit 3Lesson 3 How Do We Measure Weather?
Lying Low, Reaching High
Copyright Houghton Mifflin Harcourt Publishing Company
Low clouds form below about 2,000 m (6,500 ft).
Middle clouds form between 2,000 m and 6,000 m(6,500 ft and 20,000 ft).
High clouds form above 6,000 m (20,000 ft). Highclouds are often made of ice crystals because ofthe low temperatures.
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Unit 3Lesson 3 How Do We Measure Weather?
Lying Low, Reaching High
Copyright Houghton Mifflin Harcourt Publishing Company
Use this cloud classification chart to identify theclouds in the sky today.
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Unit 3Lesson 3 How Do We Measure Weather?
Its Pouring Solids and Liquids
Copyright Houghton Mifflin Harcourt Publishing Company
Precipitationis solid or liquid water that falls fromclouds to Earths surface.
As air temperature changes, precipitation may fallas either a solid or liquid.
Air temperature changes by season, elevation,and location.
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Unit 3Lesson 3 How Do We Measure Weather?
Its Pouring Solids and Liquids
Copyright Houghton Mifflin Harcourt Publishing Company
Rain is liquid and falls through warm or cool air.
Snow is solid and falls through cold air.
Sleet is precipitation that freezes near the ground.
Hail is solid precipitation made of layers of ice.
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Rain
Rain can start out high in the atmosphere assnow.
Raindrops can range in size from about 0.1 mm indiameter to as large as 6 mm in diameter.
Rain gauges are used to measure the depth ofrain that falls in an area.
Copyright Houghton Mifflin Harcourt Publishing Company
Unit 3Lesson 3 How Do We Measure Weather?
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Sleet
Sleet is made up of small pellets of ice.
Sleet can form when snow partially melts as itfalls through a warm layer of air.
The melted snow can freeze again in a cold layernear the ground to form sleet.
Copyright Houghton Mifflin Harcourt Publishing Company
Unit 3Lesson 3 How Do We Measure Weather?
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Hail
Hail forms when wind carries raindrops high intothe colder part of a cloud.
The raindrops freeze and fall to a warmer part of acloud.
A new layer of moisture may stick to the hailparticles.
Copyright Houghton Mifflin Harcourt Publishing Company
Unit 3Lesson 3 How Do We Measure Weather?
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Hail
The wind can carry the hail particles up again andagain.
Large hail particles will fall to the ground.
Copyright Houghton Mifflin Harcourt Publishing Company
Unit 3Lesson 3 How Do We Measure Weather?
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Snow
Snow forms when water vapor turns directly into asolid in the atmosphere.
Air currents keep snow crystals in theatmosphere.
Once a snow crystal is too large, it will fall toEarth.
Copyright Houghton Mifflin Harcourt Publishing Company
Unit 3Lesson 3 How Do We Measure Weather?