Radar-based Message Day Verification Chad A. Kudym, GIS Administrator, Information Services and Flood Warning Program The Information Services and Flood Warning Program staff worked with their weather data vendor, Weather Decision Technologies (WDT), to test gage-corrected quantitative precipitation estimates (QPE_GC). The District’s goal was to assess the value of QPE_GC for the Flash Flood Prediction Program (F2P2) both in real-time and for verifying message-level rainfall on a daily basis. The Community Collaborative Rain, Hail and Snow (CoCoRaHS) volunteer observer network data were used for statistical analysis to independently verify QPE_GC estimates. In 2008 the District will be working with WDT to assess the value of basin-averaged QPE_GC for flash flood prediction. The basin average product should help local officials compare real-time radar precipitation estimates with flash flood guidance tables and other threshold criteria set forth in basin-specific flood warning plans. The WDT products may also be used to drive real-time runoff models and inundation mapping. |
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