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Application of GPS data on Severe Weather Forecasting

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. Motivation.

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Application of GPS data on Severe Weather Forecasting

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  1. 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

  2. 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

  3. Hydrostatic Delay Ionospheric Delay GPS Signal Delay Wet Delay Tropospheric Delay PWV Calculation of PWV

  4. Selection of Data PWV PWV Error Raw Data Source Latest 04a Best Accuracy Center

  5. Visualization Tool – Web • PWV • http://openlab3/~swirls/2005.html • VIL • http://openlab3/~swirls/vil.cgi?id=0507201200-hksl • Radar Image • http://openlab3/~swirls/radar_js.html

  6. PWV Climatology

  7. Mean

  8. Standard Deviation

  9. PWV before Rainstorm

  10. Scatter Plot: VIL vs PWV

  11. VIL vs PWV Time Change

  12. VIL vs PWV Time Change

  13. Thank You Any Questions?

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