ESA’s October 30 release of a Sentinel-3 thermal image reveals Super Typhoon Champi’s 50-kilometre eye and cloud tops as cold as minus 70°C. The image was captured on October 21, not today.
A new satellite view of an extraordinary storm
The European Space Agency published a striking false-colour image of Super Typhoon Champi on October 30, revealing a sharply defined eye and unusually cold cloud tops in a storm that affected the waters near Taiwan and the Philippines. The image was acquired earlier, on October 21, by the Copernicus Sentinel-3 satellite. ESA says Champi reached maximum sustained winds of 296 kilometres per hour, making it the strongest tropical cyclone recorded so far in 2026. The new development is the publication and interpretation of the satellite image, not a claim that the storm formed on October 30.
Why the colours are not what a camera sees
The picture is a false-colour representation of thermal measurements, not an ordinary visible-light photograph. ESA assigned different colours to ranges of brightness temperature so that features within the storm could be distinguished. The result is dramatic, but the colours should not be interpreted as the actual appearance of clouds to an observer. This is a common practice in Earth observation: instruments record physical quantities that are then translated into images people can examine. The scientific value comes from the underlying measurement, while the colour palette helps make patterns easier to recognize.
The instrument behind the image
Sentinel-3 carries a Sea and Land Surface Temperature Radiometer, known as SLSTR. The instrument measures radiation in thermal infrared wavelengths and other spectral bands, supporting observations of the ocean, land and atmosphere. In the Champi image, its thermal data reveal differences between very cold high cloud tops and warmer surrounding surfaces. The satellite is part of Europe’s Copernicus Earth-observation programme, which supplies information for environmental monitoring. This particular image is a published snapshot of the storm, not a complete real-time forecast or a replacement for operational meteorological advisories.
A storm eye roughly 50 kilometres across
ESA describes the typhoon’s eye as approximately 50 kilometres wide. The eye is the relatively organized central region around which the most intense thunderstorms rotate. Its appearance can provide information about a cyclone’s structure, although size alone does not determine the wind speed or damage potential. Meteorologists examine many variables, including pressure, cloud organization and movement over time. A single satellite frame cannot establish the storm’s entire evolution. The clear eye in the image nevertheless illustrates how organized Champi had become when the observation was made.
What the coldest cloud tops reveal
The green, white and light-grey regions in ESA’s rendering correspond to extremely cold cloud tops near the storm’s centre, reaching temperatures as low as minus 70 degrees Celsius. Such low brightness temperatures are associated with very high, deep convective cloud systems. They indicate vigorous vertical development, though the exact relationship between cloud-top temperature and surface winds is complex. A colder cloud does not automatically mean a stronger wind at every location beneath it. The image helps scientists see storm structure, but it must be interpreted alongside other observations.
Purple clouds and warmer surroundings
ESA assigned purple to cloud regions with brightness temperatures roughly between minus 30 and minus 15 degrees Celsius. Orange areas correspond to comparatively warm ocean and land surfaces averaging about 25 degrees Celsius in the displayed scene. The contrast makes the storm’s vertical structure visually apparent. Brightness temperature is derived from measured radiance and may differ from the actual physical temperature of a particular surface or cloud layer. That qualification matters because a false-colour image is an analytical product, not a literal thermometer placed inside every cloud.
How warm oceans power tropical cyclones
Tropical cyclones draw energy from warm ocean water through evaporation and the release of latent heat as water vapour condenses. Rising moist air can support towering clouds and powerful circulation when other atmospheric conditions are favourable. The ESA image places cold cloud tops above warmer ocean areas, illustrating this broad energy relationship. The image alone does not establish why Champi reached its particular intensity; wind shear, moisture, ocean heat content and internal storm dynamics also matter. Understanding those factors requires a sequence of observations and numerical weather models.
The 296-kilometre-per-hour figure
ESA reports maximum sustained winds of 296 kilometres per hour for Champi, identifying it as the strongest tropical cyclone of the year to that point. Wind estimates can vary among agencies because they use different averaging periods and methods, so comparisons should identify the source. The number conveys extraordinary intensity, but the effects on communities also depend on storm size, speed, rainfall, terrain and exposure. A lower-wind storm can still cause severe flooding, while the most extreme winds may remain offshore. Wind speed is one important dimension of risk, not the only one.
Flooding and coastal damage in Taiwan
ESA reports that Champi brought serious flooding and damage to eastern Taiwan. Heavy rain can trigger landslides and flash flooding, especially in steep terrain or areas where drainage systems are overwhelmed. Storm effects may continue after peak winds weaken, and the severity can vary greatly across communities. The agency’s image caption does not provide a comprehensive casualty or economic-loss assessment. Responsible reporting should therefore avoid inventing totals or attributing every local incident to the storm without additional evidence. The image provides physical context for a significant weather event.
Waves approaching ten metres
According to ESA, waves near Champi’s centre reached heights of up to ten metres. Large waves threaten vessels and coastal infrastructure and can combine with elevated sea levels to produce dangerous conditions. Wave height is not identical to storm surge, which describes a rise in water level driven by weather conditions. Nor does a wave height measured near the storm’s centre mean that every coastline experienced the same seas. These distinctions are important when interpreting satellite imagery for public safety. The published numbers characterize aspects of the storm rather than conditions at every location.
Why satellites are essential over oceans
Tropical cyclones spend much of their lives over open water, where conventional weather stations are sparse. Satellites provide repeated observations of cloud structure, sea-surface conditions and other environmental variables across large areas. Different sensors contribute complementary information. Thermal infrared imagery can reveal cloud-top temperatures, while microwave instruments and other systems help scientists investigate precipitation and internal structure. Forecast centres combine these data with models and surface observations. ESA’s image is an example of the wider observational system that makes modern cyclone monitoring possible.
Sentinel-3 is more than a storm camera
The Sentinel-3 mission supports a broad range of environmental measurements, including sea and land surface temperatures and ocean colour. Its instruments are designed for consistent monitoring, not exclusively for spectacular images of extreme weather. That continuity is valuable because scientists need comparable observations over time to study changing conditions. A single striking typhoon picture may attract public attention, but the larger scientific contribution comes from regular measurements across the planet. The same observational infrastructure can help researchers study marine heatwaves, land temperatures and other environmental changes.
The difference between observation and forecast
An image captured on October 21 and published on October 30 describes a past state of the atmosphere. It cannot be used as a current warning about where Champi is now or where it will move next. Operational forecasts rely on recent data and updated modelling. Readers should check the relevant national meteorological agencies for any present hazard information. This time distinction is especially important when older satellite images circulate on social media without dates. A visually dramatic image can be accurate and still be misleading if presented as a live view.
How scientists validate a thermal image
Satellite instruments require calibration to ensure that measured radiance corresponds reliably to physical quantities. Processing algorithms then convert signals into useful data products. Clouds, viewing geometry and atmospheric absorption can complicate interpretation, so researchers compare observations across instruments and time. ESA’s published false-colour rendering is based on processed Copernicus Sentinel data. The transformation into colours is a visualization choice, but the underlying measurement has a scientific basis. Understanding this process helps distinguish legitimate remote sensing from arbitrary colour manipulation.
Why the strongest storm is not the only story
A record or season-leading intensity can dominate headlines, yet preparedness and recovery depend on many other factors. Coastal exposure, building quality, evacuation access and rainfall-driven flooding shape the consequences of a cyclone. The satellite view can show a powerful atmospheric system, but it cannot tell the full story of individual communities. Detailed damage assessments require reports from local authorities and independent observers. The value of ESA’s image is to reveal the storm’s physical structure while providing context for the hazards experienced around it.
What the October 30 release establishes
The newly released ESA image documents Champi’s structure on October 21, including an eye about 50 kilometres across and cloud-top brightness temperatures as low as minus 70 degrees Celsius. ESA also provides context about the storm’s reported 296-kilometre-per-hour sustained winds, flooding in eastern Taiwan and waves near ten metres. Those are specific, attributable findings. The release does not demonstrate that the storm was active on October 30 or provide a complete disaster assessment. The distinction preserves the scientific and journalistic value of the image without turning a dated observation into breaking weather advice.
Frequently asked questions
When was the satellite image captured?
October 21, 2026. ESA published its interpretation on October 30.
Are the colours what the typhoon really looked like?
No. They represent ranges of brightness temperature derived from thermal infrared measurements.
Does the image show the storm’s current location?
No. It is a dated observation and should not be used as a live weather forecast.
Primary source: European Space Agency, October 30, 2026. Image credit in ESA release: modified Copernicus Sentinel data (2026), processed by ESA.
