Why Do Typhoon Forecast Tracks and Intensities Vary Across Different Meteorological Agencies?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-08-09
Why the "Clash of Titans"? The Scientific Truth Behind Forecast Discrepancies
When you see forecast tracks from different agencies spreading out like an "open fan" on typhoon tracking platforms or real-time release systems, there is no need to panic. This is not a data error but a normal aspect of meteorological science. Typhoon forecasting is essentially a simulation of future atmospheric states, and the atmosphere is an extremely complex chaotic system. Currently, major global meteorological agencies (such as the China Meteorological Administration [CMA], the Japan Meteorological Agency [JMA], and the Joint Typhoon Warning Center [JTWC]) all rely on supercomputers to run numerical weather prediction models. Since each agency uses different initial observational data sources, mathematical model algorithms, and weightings for key parameters such as sea surface temperature and upper-level wind fields, the calculated results naturally differ. It is akin to several experienced captains judging their course based on their own charts and experience; while the general direction is consistent, details inevitably vary. Therefore, when checking real-time typhoon tracks, referring to the "ensemble forecasts" of multiple agencies is often more reliable than relying on a single source.
Why Is Intensity Harder to Predict?
Compared to track forecasting, predicting typhoon intensity is more difficult, and discrepancies are more common. The track is mainly guided by large-scale environmental airflow, with relatively obvious patterns; whereas intensity changes are deeply influenced by subtle adjustments in the typhoon's internal structure, such as eyewall replacement cycles and convective bursts in the core cloud clusters. These micro-processes are extremely difficult for satellites and radar to fully capture with current technology. Additionally, changes in sea surface temperature in the areas traversed by the typhoon and the magnitude of vertical wind shear can instantly alter its energy supply. According to the National Standard for Tropical Cyclone Grades issued by the CMA, a typhoon upgrading from a severe tropical storm to a typhoon, or intensifying from a typhoon to a severe typhoon, often occurs within just a few hours. This rapid intensification or weakening is sudden, leading to differences of 1-2 grades in wind force assessments by different agencies at the same moment. For the public, paying attention to the scope of wind impact is more practically significant for disaster prevention than fixating on whether it is specifically Force 12 or Force 13.
How to Properly View Warnings and Respond?
Faced with forecast discrepancies, the core strategy for ordinary residents is to "better safe than sorry" and allow for a safety margin. Do not wait until the typhoon center moves exactly along a specific predicted line before taking action, as the actual impact area often extends far beyond both sides of the track line. When meteorological departments issue typhoon warning signals, it means that wind and rain impacts are imminent or already occurring. It should be noted that regulations regarding school suspensions, work stoppages, and transport halts are linked to the level of local warning signals, but specific implementation standards may vary by location; please refer to announcements from local governments. During the approach of a typhoon, it is recommended that everyone:
- Focus on Trends: Pay attention to the long-term movement trend of the path, rather than minor fluctuations in any given hour.
- Stock Up on Supplies: Reserve at least 3 days' worth of drinking water, food, and emergency medications in advance.
- Reinforce Windows and Doors: Check for clutter on balconies and apply tape in an asterisk pattern to prevent glass from shattering.
Maintaining rational attention and adopting scientific preventive measures is the best approach to dealing with typhoon 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.