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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
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.
Weather buoys, Doppler radar, weather balloons, and satellites collect weather data.
The characteristics of an air mass are similar to the conditions of the place where it forms.
Cold air masses form near the Earth’s poles; dry air masses form over land.
Weather changes take place at fronts; a warm front brings warm air to a place it passes over.
Meteorologists use weather data and weather patterns to forecast weather.
Weather forecasts are accurate within five to seven days.
Local winds at beaches are due to differences in temperature.
Weather satellites make it possible to collect data from uninhabited parts of Earth.
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.
© Houghton Mifflin Harcourt Publishing Company
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