Sun-Driven Weather Systems
Understand how the Sun drives weather: the Sun heats Earth's surface unevenly (land heats faster than water, equator gets more heat than poles), creating differences in air pressure that cause wind patterns, ocean currents, and large-scale weather systems
What a learner can do afterwards
- Explain that the Sun heats land and water at different rates
- Describe how temperature differences create air pressure differences that drive wind
- Connect uneven heating to large-scale weather patterns
The lesson
You already know wind is air on the move, blowing from high pressure to low pressure. Here is where that difference starts: the Sun. The Sun does not heat every part of Earth the same way. Some places heat up fast and some heat up slowly, and that gap is what gets air moving in the first place.
Land heats up fast and cools down fast. Water heats up slowly and holds its heat. Over land, the hot ground warms the air above it, and that warm air rises, so the pressure near the ground drops. Over the water, the air stays cooler, so the pressure stays higher. Since air moves from high pressure to low pressure, cooler air flows in from the water toward the land.
At the beach in the afternoon, the sand gets so hot you can barely stand on it, but the ocean water still feels cool. The hot sand warms the air above it, and that air rises. Cooler air from over the water rushes in to take its place. That rush of cool air is the sea breeze you feel on your face.
The same idea works on a much bigger scale. The equator gets strong, direct sunlight all year, so it stays hot. The poles get weak, slanted sunlight, so they stay cold. That huge temperature gap is part of what drives the big wind patterns and ocean currents that move heat around the whole planet.
The Sun heats Earth unevenly, and those temperature differences create the pressure differences that drive wind, ocean currents, and weather.
Watch it
Where it sits
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.