How cyclone forecasts combine satellites, radar and weather models
Cyclone forecasts are built from observations and model guidance, then updated as the storm changes. No single satellite image or forecast line is the whole prediction.
IMD combines observations, satellite imagery, radar where available, numerical weather-prediction guidance and meteorological analysis to issue cyclone bulletins. Forecast tracks and intensity estimates are updated as new data arrive.
Observations show what is happening now
Satellites help monitor cloud structure and movement over the sea, while surface observations and other instruments provide information about the environment. Doppler weather radar can help track precipitation and storm structure near the coast where coverage is available. Each instrument has limits, so forecasters combine several types of evidence.
Models estimate what may happen next
Numerical weather-prediction models use atmospheric observations and mathematical equations to project future conditions. Different models can produce different tracks or intensities, especially when a storm is changing quickly. Forecasters compare guidance, assess uncertainty and update the expected track and timing.
Why a forecast needs a timestamp
An official bulletin records when it was issued and how long it is valid. A forecast from yesterday may be useful for background but should not replace today's observation. Read the latest position, intensity, expected movement, rainfall and safety advice together rather than interpreting one map line as a guarantee.
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Frequently asked questions
Can one satellite image confirm a cyclone's future landfall point?
No. It is one observation. Forecasts combine multiple observations, analysis and model guidance, and the expected track can change.
Why do official cyclone bulletins keep changing?
New observations arrive and the storm evolves, so forecasters update position, intensity and timing to reflect the latest evidence.