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Name _____________________________________________ Extra Support for Vocabulary and Concepts How Is Weather Predicted? Science Words Say each word quietly to yourself. Then read the meaning. Read the tip to help you remember. air mass [AIR MAS] a large body of air with the same temperature and humidity throughout Mass is the amount of matter in an object. Mass also means a body of matter—any kind of matter. The matter in an air mass is air. front [FRUHNT] the boundary between two air masses Think about your home. Your front door is a boundary. Your home is on one side of the boundary. Everything else is on the other side. A weather front is also a boundary. Warm air may be on one side of the boundary. Cooler air may be on the other side. Science Concepts Read the Ideas more than once. Do your best to remember them. 1. Weather buoys, Doppler radar, weather balloons, and satellites collect weather data. 2. The characteristics of an air mass are similar to the conditions of the place where it forms. 3. Cold air masses form near the Earth’s poles; dry air masses form over land. 4. Weather changes take place at fronts; a warm front brings warm air to a place it passes over. 5. Meteorologists use weather data and weather patterns to forecast weather. 6. Weather forecasts are accurate within five to seven days. 7. Local winds at beaches are due to differences in temperature. 8. Weather satellites make it possible to collect data from uninhabited parts of Earth. 9. Weather satellites provide images of hurricane size and movement. 10. A cold front is when a cold air mass pushes warm air up; water vapor cools and forms clouds. 29 © Houghton Mifflin Harcourt Publishing Company Edit File