How Are Typhoons Monitored? Unveiling Satellite, Radar, and Aircraft Observations

From cloud imagery of the Fengyun satellites to precipitation scans by Doppler radar, and even US military reconnaissance aircraft flying directly through the typhoon eye, modern typhoon monitoring is a multi-dimensional operation.

Three Major Monitoring Methods

1. Meteorological Satellites: The Farthest Reach

Satellites are the backbone of typhoon monitoring. China's Fengyun series (FY-4A/4B geostationary satellites + polar-orbiting satellites) and Japan's Himawari-9 provide round-the-clock oversight of the Western Pacific:

• Geostationary satellites capture full-disk cloud imagery every 10 minutes (as frequently as every 1 minute for key areas)
• Typhoon intensity is estimated using the "Dvorak technique" based on cloud-top temperatures and cloud pattern structures
• Microwave sensors can penetrate cloud layers to perform a "CT scan" of the typhoon's internal structure

When typhoons are in the deep ocean with no ships or aircraft nearby, satellites are the only eyes watching.

2. Weather Radar: The Clearest View

When a typhoon approaches within approximately 400 kilometers of land, the coastal Doppler radar network springs into action:

• Scans are performed every 6 minutes to capture spiral rainbands and eyewall structures in real time
• Doppler velocity data directly retrieves wind field distribution
• This is crucial for short-term forecasts of landfall location and timing

3. Aircraft Reconnaissance: The Most Accurate Measurements

The US Air Force "Hurricane Hunters" regularly fly through the centers of Atlantic hurricanes, dropping dropsondes to directly measure central pressure and wind speed. In the Northwest Pacific, monitoring currently relies mainly on satellites and radar. However, China and Taiwan have conducted aircraft interception experiments (such as the "Typhoon Chase Project"), and drone detection represents the future direction.

How Data Becomes Forecast

Observational data is fed into numerical weather prediction models (such as the European ECMWF, American GFS, and Chinese CMA-GFS). Supercomputers solve atmospheric equations to generate future path and intensity forecasts. Since different countries use different physical schemes and initial field processing, forecast results naturally diverge. This is precisely why TaifengSays provides comparisons of forecasts from Chinese, Japanese, American, and other agencies: the magnitude of divergence itself is a signal of uncertainty.

Monitoring Results Useful for the General Public

TaifengSays synchronizes real-time track data with official releases every 5 minutes, including the latest positioning, intensity, wind circles, and multi-agency forecasts. All of this is supported by the comprehensive observation system described above.