Analysis of a Heavy Rainfall Event with GPS Data of Precipitation

The results between the GPS/PWV data during 10-20 September 2002 and the actual surface rainfall are analyzed. It shows that the consecutive observation data of precipitable water vapor per 30 minutes would be instructive for the forecasting of actual rainfall. First,the first arrival of PWV and last appearance of 50mm PWV would correspond well to the beginning and end of actual precipitation. When the precipitable water vapor larger than 50mm lasts longer, the actual rainfall will be more. Whereas the result will be contrary. Next, the change of rainfall within 3 and 24 hours would be instructive to forecast the future rainfall region and rainfall distribution. Finally, the trend of precipitable water vapor in the various stages can reflect the change of 500hPa field and 700hPa vapor field. It has shown us more useful basis to clarify the vapor source and transmission in actual rainfall forecast.

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