How to Read Typhoon Satellite Imagery? What Do Different Colors Represent in Cloud Structures?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-08-13
When a typhoon approaches, satellite imagery is often the primary window for obtaining intuitive, real-time information. Many people searching for terms like "Typhoon Nangka satellite image" or "real-time typhoon track map" can be confused by the colorful visuals. In reality, you don't need a professional degree in meteorology to interpret satellite images. By mastering a few core visual elements, you can roughly assess the typhoon's intensity and identify dangerous areas, buying valuable time for household disaster preparedness.
The Temperature Secrets Behind the Colors
Satellite imagery is essentially a "temperature map." In common infrared-enhanced cloud images, colors do not represent the amount of rainfall, but rather the temperature of the cloud tops.
- White and Bright White: These indicate thick clouds with high cloud tops. Since temperatures are lower at higher altitudes, they appear as cold-toned white.
- Red, Purple, or Black: These dark-colored areas usually represent extremely high and thick convective cloud clusters. In a typhoon, these often correspond to the most intense updrafts and heavy rain zones. If you see large patches of deep red or purple near the typhoon's center, it indicates massive energy accumulation, suggesting potentially severe wind and rain.
- Gray or Light Blue: These typically indicate thinner or lower cloud layers, where rainfall intensity is relatively weaker.
It is important to note that while color schemes may vary slightly among different meteorological agencies, the basic logic remains universal: "the darker (colder) the color, the higher the cloud top, and the more severe the weather."
Identifying the "Eye" and Spiral Structure
Beyond color, the shape is key to judging a typhoon's maturity. A well-developed, powerful typhoon usually presents a clear spiral structure on satellite images.
- The Eye: If a clear, round, and cloud-free black void appears at the center of the spiral, this is the "eye." A distinct eye usually implies a tight structure and strong intensity. However, please note that while conditions inside the eye are calm, the eyewall (the ring of clouds surrounding the eye) is the area with the strongest winds and greatest destructive power.
- Spiral Rainbands: The arms extending outward from the center are called spiral rainbands. Even far from the center, when these bands sweep through an area, they can bring gusty winds and short-duration heavy precipitation. Therefore, do not assume you are absolutely safe just because you are far from the center; remain vigilant against sudden attacks from outer rainbands.
Viewing Tracks and Warnings Rationally
Satellite imagery shows the "current status," while typhoon track maps predict the "future." Combining both provides the most valuable reference. When you see a typhoon approaching your location on dynamic maps, pay close attention to warning signals issued by local meteorological departments. According to the standards of the China Meteorological Administration (CMA), typhoons are classified into five categories: tropical storm, severe tropical storm, typhoon, severe typhoon, and super typhoon.
Once a high-level warning is issued, strictly adhere to local regulations regarding school suspensions, work stoppages, and transport halts. It is worth noting that specific criteria and enforcement levels for implementing the "Five Suspensions" (suspension of classes, work, production, transport, and business) may vary by region. Always refer to the latest announcements from local governments and emergency management departments. Do not rely solely on visual estimates of distance from satellite images or take chances. Preparing supplies in advance and reinforcing windows and doors are the best strategies for coping with uncertainty.
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.