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Earth Science
How Weather Satellites Track Storms
Geostationary eyes on the atmosphere
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Weather satellites help scientists watch storms form, grow, and move across the planet. From space, they can see cloud patterns, hurricane eyes, rain bands, and the large air currents that steer storms. This matters because faster and more accurate storm tracking gives people more time to prepare for dangerous winds, flooding, and storm surge. Satellites such as GOES-16 provide frequent images that help forecasters monitor hurricanes over the Atlantic Ocean.
Key Facts
- Geostationary satellites orbit above the equator and stay over the same region of Earth.
- Polar-orbiting satellites pass over both poles and scan the whole planet in strips.
- Visible light images show sunlight reflected by clouds, land, and ocean, so they work best during daytime.
- Infrared images detect heat energy and can show cloud-top temperatures at night or during the day.
- Colder cloud tops often mean taller storm clouds and stronger thunderstorms.
- Storm speed = distance traveled / time, so a storm that moves 300 km in 6 h has a speed of 50 km/h.
Vocabulary
- Geostationary satellite
- A satellite that orbits at the same rate Earth rotates, so it appears to stay above one area.
- Polar orbit
- An orbit that carries a satellite over or near the North and South Poles as Earth turns beneath it.
- Infrared channel
- A satellite sensor view that measures heat energy to estimate temperatures of cloud tops, land, and ocean.
- Water vapor channel
- A satellite sensor view that shows moisture patterns in the middle and upper atmosphere.
- Eyewall
- The ring of intense thunderstorms around a hurricane eye where the strongest winds and heaviest rain often occur.
Common Mistakes to Avoid
- Thinking satellites can see wind directly, which is wrong because most satellites track wind by watching how clouds or water vapor features move over time.
- Using visible images at night, which is wrong because visible channels need reflected sunlight and cannot show normal cloud detail in darkness.
- Assuming every cold cloud top means a hurricane is getting stronger, which is wrong because cold cloud tops show tall clouds but forecasters must also examine shape, organization, pressure, and wind data.
- Confusing geostationary and polar satellites, which is wrong because geostationary satellites repeatedly watch one large region while polar satellites scan the whole Earth over time.
Practice Questions
- 1 A hurricane eye moves 240 km west in 4 hours. What is the average speed of the storm in km/h?
- 2 A GOES satellite image updates every 5 minutes. How many new images can it collect in 1 hour?
- 3 Explain why forecasters use visible, infrared, and water vapor satellite channels together instead of relying on only one type of image.