Why Do Typhoon Forecast Tracks and Intensities Vary Across Meteorological Agencies?
TyphoonSays·防御问答 · Typhoon knowledge · 更新 at 2026-09-27
Why Do Forecasts "Conflict"?
When you open several weather apps on your phone simultaneously, you may notice a confusing phenomenon: for the same typhoon, one agency predicts it will head straight for the coast, while another says it will turn north; one warns of winds reaching Force 14, while another only reports Force 12. This discrepancy is not because one side "miscalculated," but stems from the extreme complexity of typhoon prediction itself. A typhoon is a massive thermodynamic system, and its movement and intensity changes are jointly constrained by the subtropical high, westerlies, monsoon troughs, and other surrounding weather systems. It is akin to predicting the path of a leaf in a turbulent and variable river; tiny differences in initial conditions, after evolving over several days, can lead to significant deviations in the final outcome. Therefore, it is scientifically normal for different meteorological agencies to reach slightly different conclusions based on their respective data sources and computational models.
Where Do the Core Differences Come From?
The main reasons for forecast discrepancies usually concentrate on the following three aspects:
- Differences in Numerical Prediction Models: Major global meteorological centers (such as the CMA (China Meteorological Administration), the Joint Typhoon Warning Center (JTWC) of the United States, and the Japan Meteorological Agency (JMA)) possess independently developed numerical weather prediction models. These models use different parameterization schemes for atmospheric physical processes. Like different chefs preparing the same dish, slight differences in recipes and heat control lead to different flavors.
- Observational Errors in Initial Data: Typhoons mostly form over vast ocean areas where meteorological observation stations are sparse. Although we have satellites and buoys, there are still blind spots in acquiring initial data such as sea surface temperature and wind fields. If there are minor deviations in the basic data input into the model, the output results will amplify over time.
- Intensity Prediction Is More Difficult Than Track Prediction: Currently, the accuracy of typhoon track prediction has improved significantly, but intensity prediction remains a global challenge. Microscopic processes within the typhoon, such as eyewall replacement cycles and the impact of vertical wind shear, are extremely difficult for global models to capture precisely. This leads to significant disagreements among agencies regarding estimates of maximum wind speed and minimum central pressure.
How Should Residents Respond Correctly?
Faced with multiple forecast versions, ordinary residents need not suffer from decision paralysis. It is recommended to adopt a defensive strategy of "preparing for the worst-case scenario." First, rely on the warning signals issued by the official meteorological department in your area. In China, tropical cyclone categories are classified according to the national standard "Tropical Cyclone Grades" (GB/T 19201-2006), ranging from tropical depression to super typhoon across six levels. When official yellow, orange, or red typhoon warnings are issued, measures such as school suspensions and work stoppages may be implemented, but standards may vary by location, so refer to local government announcements.
Second, do not focus solely on the track point at a specific time, but pay attention to the "probability circle" or "area of impact." Even if the typhoon center does not make direct landfall, its outer spiral rainbands and strong wind zones may still bring heavy rain and gales. Therefore, regardless of minor adjustments in the predicted track, as long as you are within the alert range, you should reinforce windows and doors, stock up on supplies, and avoid going out in advance. Keeping up with the latest authoritative information is more important than fretting over minor discrepancies between different agencies.
Real-time typhoon tracks can be queried at TyphoonSays (taifengshuo.com)
This article is original educational content from TyphoonSays. Please refer to the latest official announcements from local governments for policy standards.