How to Read Typhoon Satellite Imagery? What Do Different Colors Represent in Cloud Structures?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-08-11
When a typhoon approaches, many people feel confused by the colorful cloud clusters when checking "Typhoon Noul satellite images" or real-time tracks. In fact, satellite imagery is like an "X-ray" of a typhoon. Understanding it not only satisfies curiosity but also helps us intuitively judge the typhoon's intensity and danger level.
The Temperature Secret Behind the Colors
The colors on satellite imagery are not random; they represent the temperature of the cloud tops. In common infrared enhanced color scales, colder colors (usually displayed as white, red, or even purple) indicate higher clouds and more vigorous convection.
- Grayish-white/Light blue: Typically low-level clouds or cirrus clouds with higher temperatures, having relatively less impact on the ground.
- Dark blue/Green: Mid-level cloud systems, possibly accompanied by showers.
- Yellow/Red: High-level cumulonimbus clouds with extremely low cloud-top temperatures, indicating strong updrafts. These areas often correspond to heavy rain and strong winds.
- Purple/Black (in some enhanced images): This is the most dangerous signal, representing the core area with extremely high cloud tops and intense convection. It is usually located near the eyewall and has the greatest destructive power.
Simply put, when you see large areas of red or purple cloud clusters tightly wrapping around the center on the satellite image, it indicates that the typhoon has a complete structure and immense energy. Stay alert.
Identifying the Typhoon "Eye" and Intensity at a Glance
Besides looking at colors, observe the shape. A mature, powerful typhoon usually presents a clear spiral structure on satellite imagery, with a distinct cloud-free or sparse-cloud area in the center, known as the "typhoon eye."
- Clear and round eye: If the typhoon eye is small and round, surrounded by a thick and tight cloud wall (the dark, high-temperature-difference areas mentioned above), it indicates a compact structure. The intensity is likely to reach the level of a severe typhoon or super typhoon (according to the National Standard for Tropical Cyclone Grades by the China Meteorological Administration).
- Blurry or missing eye: If the central cloud system is disorganized without a distinct eye, or if the cloud clusters are loose, it usually means the typhoon is weaker, or it is weakening due to factors such as terrain or vertical wind shear.
Note that satellite imagery reflects upper-atmosphere conditions, while wind and rain are experienced primarily at ground level. Therefore, even if the imagery looks spectacular, it does not mean every location will experience extreme weather. Specific wind conditions should be assessed based on forecasts issued by local meteorological departments.
Scientific Defense: Follow Official Warnings
Understanding satellite imagery helps assist in decision-making, but final action guidelines must rely on official warning signals. When meteorological departments issue yellow, orange, or red typhoon warnings, measures such as school suspensions and work stoppages may be implemented. Please note that standards may vary by region; follow the announcements from your local government.
We recommend developing the habit of observing the general movement and structural changes of typhoons through satellite imagery daily to build disaster prevention intuition. At critical times, strictly follow the latest warning information and emergency guidelines issued by local meteorological observatories. Secure windows and doors, stockpile supplies, and do not venture out based solely on your personal interpretation of satellite imagery.
Real-time typhoon tracks can be queried at TyphoonSays (taifengshuo.com)
This article is typhoonsay's original copy content, and the local policy standards are based on the local government's latest release.