How to Read Typhoon Satellite Images: What Do the Different Colors Mean for Cloud Structures?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-08-13
When a typhoon approaches, satellite imagery is often the first source of intuitive information people use. Many people searching for “Typhoon NOUL satellite image” or “real-time typhoon track map” can easily be confused by the colorful images. In fact, understanding satellite cloud images does not require a degree in meteorology. By mastering a few key visual elements, you can broadly assess a typhoon’s intensity and hazardous areas, gaining valuable time for household disaster preparedness.
The Temperature Secret Behind the Colors
A satellite cloud image is essentially a “temperature map.” In common infrared-enhanced satellite imagery, colors do not indicate how much rainfall there is, but rather the temperature of cloud tops.
- White and bright white: These indicate thicker clouds with higher cloud tops. Because temperatures are lower at high altitudes, they appear in cold shades of white.
- Red, purple, or black: These darker areas usually represent extremely high, thick convective cloud masses. In a typhoon, they often correspond to the strongest updrafts and zones of heavy rainfall. If you see large areas of deep red or purple near the typhoon’s center, the area has tremendous energy, and wind and rain may be extremely violent.
- Gray or light blue: These generally indicate thinner or lower clouds, with relatively weaker rainfall.
It is worth noting that color schemes may vary slightly among meteorological agencies, but the basic principle—“the deeper (colder) the color, the higher the clouds and the more severe the weather”—is universally applicable.
Identifying the “Eye” and Spiral Structure
In addition to color, shape is key to judging a typhoon’s maturity. A mature, strong typhoon typically displays a clearly defined spiral structure in satellite imagery.
- Typhoon eye: If a clear, rounded, cloud-free dark hole appears at the center of the spiral, this is the “eye.” A well-defined eye usually indicates a tightly organized and intense typhoon. However, remember that although conditions within the eye may be calm, the eyewall—the ring of clouds surrounding the eye—is where winds are strongest and damage is greatest.
- Spiral rainbands: The spiral arms extending outward from the center are called spiral rainbands. Even when relatively far from the center, these rainbands can bring gusty winds and short periods of heavy rainfall as they pass through. Therefore, do not assume that being far from the center means you are completely safe; remain alert to sudden attacks by outer rainbands.
View Tracks and Warnings Rationally
Satellite imagery shows the “present,” while typhoon track maps predict the “future.” The two are most useful when considered together. When you see a typhoon approaching your area on an animated map, closely monitor warning signals issued by local meteorological authorities. Under CMA standards, typhoons are classified at five levels: tropical storm, severe tropical storm, typhoon, severe typhoon, and super typhoon.
Once a high-level warning is issued, you must strictly follow local directives on suspending classes, stopping work, and suspending transportation. A special reminder: the specific criteria for initiating the “five suspensions”—class closures, work stoppages, production shutdowns, transportation suspensions, and business closures—may vary by location, as may their enforcement. Follow the latest notices issued by local governments and emergency management departments. Never take chances based solely on estimating distance from a cloud image. Stocking up on essentials and reinforcing doors and windows in advance are the best ways to prepare for uncertainty.
Real-time typhoon tracks can be checked on TyphoonSays (taifengshuo.com).
This article is original educational content from TyphoonSays. Please refer to the latest official announcements from local governments for policy standards.