News & Events

CWEST Seminar: Implementation of Community WRF-Hydro Modeling System as the new NOAA National Water

Wednesday, September 07, 2016, 11:00AM - 12:00PM


David Gochis



SEEC Auditorium

Please join CWEST for a Distinguished Seminar fon Wednesday, September 7th 11-12am in SEEC’s Auditorium. Abstract is below. CWEST seminars will be held once a month conjunction with the INSTAAR seminar series and the Hydrology and Water Resources seminar series. Refreshments provided.


The National Weather Service (NWS) Office of Water Prediction (OWP), in conjunction with the National Center for Atmospheric Research (NCAR) and the NWS National Centers for Environmental Prediction (NCEP) recently implemented version 1.0 of the National Water Model (NWM) into operations. This model is an hourly cycling uncoupled analysis and forecast system that provides streamflow for 2.7 million river reaches and other hydrologic information on 1km and 250m grids. It will provide complementary hydrologic guidance at current NWS river forecast locations and significantly expand
guidance coverage and type in underserved locations.

The core of this system is the NCAR-supported community Weather Research and Forecasting (WRF)-Hydro hydrologic modeling system. It ingests forcing from a variety of sources including radar-gauge observed precipitation data and numerical weather prediction data. The NWM configuration of WRF-Hydro is implemented to utilize multiple spatial mesh structures in its representation of column land surface physics, horizontal routing physics, and channel hydraulics. A novel, service-oriented feature of the NWM is the representation and provision of channel flow information on the USGS-EPA National Hydrogaphy Dataset Plus V2 (NHDPlusV2) hydrography. River analyses and forecasts are provided across a domain encompassing the Continental United States (CONUS) and hydrologically contributing areas, while land surface output is available on a larger domain that extends beyond the CONUS into Canada and Mexico (roughly from latitude 19N to 58N). The system includes an analysis and assimilation configuration along with three forecast configurations.

During this seminar, an overview of the National Water Model will be given which provides the details of the model configuration, its foundational datasets and its initial set of model outputs.  Specific emphasis will be placed on presenting available model verification statistics to date along with a couple of case studies. Lastly, ongoing and planned model enhancements will be discusses as will ways in which the broader scientific community can engage in the National Water Modeling effort.


Free and open to the public.