In this Grade 4 lesson from Science: A Closer Look, Chapter 4, students learn how air masses and fronts — including warm fronts, cold fronts, and stationary fronts — cause weather patterns to form and change. Through a hands-on inquiry activity, students investigate how changes in air temperature affect water droplets, modeling how rain forms. Students also practice reading weather maps that display temperature, precipitation, and front locations to understand how scientists forecast weather.
Section 1
Air Masses Clash to Create Weather Fronts
When air masses with different temperatures meet, they form fronts. Warm fronts bring gentle rain as warm air slides over cold air, while cold fronts cause storms as cold air forces warm air upward.
Section 2
Meteorologists Use Maps to Forecast Weather
Scientists analyze weather maps showing temperature, pressure, precipitation, and wind to predict future conditions. Satellite images and computer models help track weather patterns and warn about upcoming storms.
Section 3
Water Droplets Form Through Condensation
When warm, moist air contacts a cool surface like an ice-chilled lid, water vapor in the air changes from gas to liquid. This condensation process creates water droplets, similar to how clouds form.
Section 4
Severe Storms Require Safety Precautions
Thunderstorms, tornadoes, and hurricanes bring dangerous conditions. Staying informed through weather alerts, seeking appropriate shelter, and following safety guidelines helps protect people during severe weather events.
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Section 1
Air Masses Clash to Create Weather Fronts
When air masses with different temperatures meet, they form fronts. Warm fronts bring gentle rain as warm air slides over cold air, while cold fronts cause storms as cold air forces warm air upward.
Section 2
Meteorologists Use Maps to Forecast Weather
Scientists analyze weather maps showing temperature, pressure, precipitation, and wind to predict future conditions. Satellite images and computer models help track weather patterns and warn about upcoming storms.
Section 3
Water Droplets Form Through Condensation
When warm, moist air contacts a cool surface like an ice-chilled lid, water vapor in the air changes from gas to liquid. This condensation process creates water droplets, similar to how clouds form.
Section 4
Severe Storms Require Safety Precautions
Thunderstorms, tornadoes, and hurricanes bring dangerous conditions. Staying informed through weather alerts, seeking appropriate shelter, and following safety guidelines helps protect people during severe weather events.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter