How to Read Typhoon Satellite Imagery? What Do the Different Colors Represent in Terms of Cloud Structure?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-09-01
The Whiter the Color, the Stronger the Wind and Rain
For the general public, the most intuitive way to interpret satellite imagery is by observing the shade of colors. In common infrared or visible light satellite images, colors primarily reflect the height and temperature of cloud tops. Generally, the brighter and thicker the white, the higher the clouds and the more vigorous the convection, which often corresponds to heavier rainfall and stronger winds.
You can imagine the satellite image as a "heat map":
- Gray-black or dark gray areas: Usually represent the ocean surface or low-level thin clouds. The weather here is relatively calm with light winds.
- Light white areas: Represent mid-to-low level cloud systems. There may be showers or light rain, but the destructive potential is limited.
- Bright white to snow-white areas: These are the areas requiring close attention. They represent towering cumulonimbus clouds with extremely low cloud-top temperatures, indicating strong updrafts. These areas are often accompanied by heavy rain, thunderstorms, and gale-force winds.
- Central eye region: If a typhoon is mature, a clear circular or oval cloud-free area (the typhoon eye) will appear at the center, surrounded by a tight ring of white clouds (the eyewall). The eyewall is where the wind and rain are most intense, while the interior of the eye is relatively calm. However, please note that the calmness during the passage of the eye is temporary; the eyewall on the other side will subsequently bring equally or even more severe wind and rain.
Structural Patterns Reveal the Typhoon's "Temper"
Besides color, the shape of the cloud pattern also reveals information about the typhoon's intensity and trajectory. A typhoon with a symmetric structure and tightly wrapped cloud systems usually indicates good organization, suggesting greater strength and stability. If the cloud systems are loose, asymmetric, or the center is blurred, it may indicate that the typhoon is weakening or being disrupted by environmental factors such as vertical wind shear, making its path harder to predict.
Pay special attention to the distribution of spiral rainbands. The spiral cloud bands extending outward from the center are channels for transporting moisture and energy. If the spiral bands in a certain direction are particularly dense and long, that direction is often the primary area affected by wind and rain. Additionally, when a typhoon approaches land, the interaction between the edge of the cloud pattern and the coastline can help determine the landfall point and the scope of impact.
Scientific Defense: Follow Official Warnings
Although satellite imagery helps us intuitively understand the typhoon situation, it cannot directly replace warning signals issued by meteorological departments. The China Meteorological Administration (CMA) classifies tropical cyclones into six categories based on the maximum average wind speed near the center: tropical depression, tropical storm, severe tropical storm, typhoon, severe typhoon, and super typhoon.
When meteorological departments issue typhoon warnings, the public should take action according to local government guidelines. For example, during yellow, orange, or red warning periods, measures such as school closures and business suspensions will be implemented sequentially. Standards may vary by location; please refer to announcements from your local government. Do not underestimate the risk simply because the typhoon "looks far away" on the satellite image, as the outer cloud systems and wind circles of a typhoon are often much larger than the visible cloud mass.
Stay tuned to authoritative information, combine it with trend judgments from satellite imagery, and take preventive measures such as reinforcing windows and doors and stockpiling supplies. This is the correct approach to dealing with typhoons. 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.