Mission: To support the OHD mission, we work with other OHD teams, universities, public agencies and private organizations to integrate and develop science and technology.  We deliver software and provide support primarily to NWS River Forecast Centers (RFCs).

Who we are: 

           Chris Dietz, Acting Lead
           Lee Cajina
           XiaoBiao Fan
           Joseph Gofus
           Hank Herr
           Kuang-shen Hsu
           Wen Kwock
           Joy Simms
           David Street
           Dieu Ai Vo
           Andi Voellmy
           Limin Wu

What we do: The Advanced Hydrologic Prediction Service (AHPS) is an integrated real time modeling and data management/analysis system. It provides new information and products created through the infusion of new science and technology. This service will significantly improve flood forecasting and water management in the United States for periods from days to several months into the future. 

We support the RFCs through the design, development, testing, enhancement, implementation, and support of the National Weather Service River Forecast System (NWSRFS). The advances provide:

1. Critical software enhancements to the NWSRFS; 

2. Effective calibration and field-implementation of advanced hydrologic/hydraulic models within the NWSRFS; 

3. The nucleus of capabilities to handle the integration of real-time/historical station and gridded data, and model generated (forecast) outputs; 

4. The use of short- to long-range weather and climate forecasts within the NWSRFS through hydrometeorologic coupling algorithms.

Software Applications Supported: We primarily support the NWSRFS which consists of the following components:

1. Calibration System (CS): Generates time series based on historical data and determines model parameters.  The ICP is a graphical interface to display the observed and simulated streamflow values and the IDMA is an interactive tool for conducting double mass analysis.
Supported Programs:  MAP, MCP3, MAT, OPT3, PXPP, TAPLOT, IDMA and ICP

2. Forecast System (FS): Uses calibrated parameter values to generate short-term river and flood forecasts and maintain model state variables.  The Interactive Forecast Program (IFP) is a graphical user interface to display the model outputs for an area and a time period. 
Supported Programs: ESPINIT, FCINIT, FCST, FILECRAT, FILESIZE, GOESDB, PPDUTIL, PPINIT, PRDUTIL, REORDER, SASMDB, SHEFPARS, SHEFPOST and the IFP.

3. Ensemble Streamflow Prediction System (ESP): Uses current model states and an ensemble of time series to generate an ensemble of hydrographs and probabilistic short or long-term forecasts. 
Supported Programs: ESPADP, ENS_PRE, ENS_POST, ESPVS, BATCHBUILDER

4. Data Visualization: These programs provide data quality control tools, data editing tools, and interactive forecast preparation tools. 
Supported Programs: XDAT, XNAV, XSETS

5. RFC Forecast Verification:  These programs compute statistics on matched pairs of observations and forecasts.
Supported Programs: VERIFY, IVP

6. The NWS Flash Flood Guidance System (FFGS):  Includes techniques and programs for computing flash flood guidance. 
Supported Programs: FFGUID, PRODGEN, ZGRID