Indication of GPS Precipitable Water Vapor for Rainstorm Forecast in Hubei
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Abstract:
The PWV data of GPS/MET from May to September 2012, the automatic rain gauge data and the radiosonde data are analyzed. The results are as follows: (1) There existed high correlation and small errors between GPSPWV and radiosondePWV measurements observed at the same station, but less obvious correlation when there was rainfall. (2) GPSPWV values were about 10 mm lower on plains than in hilly areas when rainfall. (3) 69% of GPSPWV values rose before a storm appearing, and in the cases of not rising, the GPSPWV reached a higher value. When the GPSPWV values of 6 hours and 12 hours were positive, it is indicated that rainstorm will start. (4) GPSPWV characteristics were different under different types of rainstorms: the storm centers of local rainstorms caused by the westerly system and subtropicalhigh in Hubei Province correspond with GPSPWV high values, with the GPSPWV threshold values being less than 40 mm and 55 mm, respectively, in west of Hubei Province and the GPSPWV threshold values being less than 52 mm and 60 mm, respectively, in mideast of Hubei Province. The local rainstorms affected by Typhoon usually lie around the dense zones of GPSPWV nearby the high values area, with the threshold values less than 45 mm. During heavy rain processes, GPSPWV high value centers appear 1 hour earlier comparing with the heavy rainfall centers under favorable weather conditions. (5) There were three kinds of situations in which storm centers locate in GPSPWV dense zones: rainstorms caused by a fastmoving storm systems, local rainstorms affected by a Typhoon, rainstorms in mountains areas. (6) It can be indicative of rainstorms very well in the mideastern Hubei Province, but poor in the mountainous area of the western Hubei, while comprehensively considering GPSPWV high values and ground convergence zone 1 hour before.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.