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Application of GPS data on Severe Weather Forecasting To investigate correlation between PWV and VIL, and hence its role in lightning/damaging winds monitoring/nowcasting Summer Internship at the Hong Kong Observatory 2006 Law Ka Hei (CUHK/PHY/3) Supervisor: Linus Yeung
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Motivation Project Goal Use PWV for severe weather nowcasting PWV - Precipitable Water Vapor Represent amount of water vapor in an atmospheric column VIL - Vertically Integrated Liquid Represent amount of liquid water in an atmospheric column Highly related to rainfall
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Calculation of PWV GPS Signal Delay Ionospheric Delay Tropospheric Delay Hydrostatic Delay Wet Delay PWV
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Selection of Data PWVPWV ErrorRaw Data Source Latest Best Accuracy Center 04a
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Visualization Tool – Web PWV http://openlab3/~swirls/2005.html http://openlab3/~swirls/2005.html VIL http://openlab3/~swirls/vil.cgi?id=0507201200- hksl http://openlab3/~swirls/vil.cgi?id=0507201200- hksl Radar Image http://openlab3/~swirls/radar_js.html http://openlab3/~swirls/radar_js.html
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PWV Climatology
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Mean
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Standard Deviation
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PWV before Rainstorm
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Scatter Plot: VIL vs PWV
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VIL vs PWV Time Change
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Thank You Any Questions?
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