Unit 5 Lesson 3 How is Weather Predicted? Copyright Houghton Mifflin Harcourt Publishing Company

Transcription

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2 Tracking the Weather Warm up 1 Why is it important to watch the weather forecast before traveling to another country?

3 Tracking the Weather A meteorologist is a scientist who studies weather. Meteorologists collect data from all over the world, using automated systems at sea, on land, in the air, and in space.

4 Tracking the Weather These automated systems include 1.weather buoys 2.weather-monitoring stations 3.weather balloons 4.weather satellites.

5 Tracking the Weather Weather buoys collect data about air temperature, air pressure, wind, and waves at sea.

6 Tracking the Weather Weather-monitoring stations collect data on air temperature, air pressure, wind, humidity, and precipitation. Some use radar to track severe storms.

7 Tracking the Weather Weather balloons carry tools, called radiosondes, into the atmosphere. A typical radiosonde measures air temperature, air pressure, and humidity.

8 Tracking the Weather Weather satellites orbit Earth and can track the weather over very large areas. They collect weather data, such as cloud cover, and track storms, such as hurricanes.

9 Tracking the Weather Exit slip 1

10 Air Masses and Fronts Warm up 2 Describe what you feel when you open and freezer and stand in-front of it for few seconds.

11 Air Masses and Fronts An air mass is a large body of air with the same temperature and humidity throughout. An air mass reflects the conditions of the place where it forms. Air masses that form over land are. Air masses that form over water are., dry air masses form near the poles, and, moist air masses form near the tropics.

12 Air Masses and Fronts As air masses move across an area, they can collide. A front is the boundary between two air masses. Weather changes take place at fronts. At a front, stormy conditions are common.

13 Air Masses and Fronts A cold front forms where a cold air mass bumps into a warmer air mass. The cold air pushes the warm air up. Water vapor in the air cools, and large clouds form. Thunderstorms and heavy rain often take place. Cooler temperatures follow a cold front.

14 Air Masses and Fronts A warm front forms where a warm air mass moves over a cold air mass. A warm front forms a wider area of clouds and rain than a cold front. Steady rain or snow may fall. Warmer temperatures will follow a warm front.

15 Air Masses and Fronts Exit slip 2 While you are in the shower the hot humid air mixes with the colder, drier air in the room. Which type of front does this represent?

16 Air Masses and Fronts Warm up 3 Complete the following: (at least 2 tools)

17 Mapping the Weather A weather forecast is a prediction about the future weather conditions of a place. Most weather forecasts are accurate within five to seven days. Forecasts beyond seven days are not very accurate. Meteorologists forecast the weather based on the local weather data, such as air temperature and humidity, and on observed weather patterns, such as moving air masses and fronts.

18 Mapping the Weather The weather data collected by weather satellites, weather-monitoring stations, and weather buoys are sent to computers. Computers help store and analyze the data and weather patterns to make weather maps. Meteorologists study these maps and use them to make weather forecasts.

19 Forewarned! Technology has changed how we measure, analyze, forecast, and share weather data. The data can be used to make computer models to predict weather events.

20 Forewarned! Meteorologists work hard to predict and track severe storms. By being able to monitor and predict severe storms, such as hurricanes, meteorologists can warn people of danger and save lives. Tropical depression Tropical storm Hurricane

21 Forewarned! Exit slip 3