NOAA NWC - Harvey National Water Model Streamflow Forecasts

The National Water Model (NWM) is a water forecasting model operated by the National Water Center (NWC) of the NOAA National Weather Service. The NWM continually forecasts flows on 2.7 million stream reaches covering 3.2 million miles of streams and rivers in the continental United States [1]. It operates as part of the national weather forecasting system, with inputs from NOAA numerical weather prediction models, and from weather and water conditions observed through the US Geological Survey's National Water Information System. Reference materials for the computational framework behind NWM is published by NCAR [9] [10]. The NWC generates NWM streamflow forecasts for the continental US (CONUS) with multiple forecast horizons and time steps. Due to the output file sizes, these are normally not available for download more than a couple days at a time [2]. However, a 40-day rolling window of these forecasts is maintained by HydroShare at RENCI [3], and a complete retrospective (August 2016 to the present) of the NWM Analysis & Assimilation outputs is maintained as well (contact [e-mail] for access). An archive of all NWM forecasts for the period Aug 18 to Sept 10, 2017 has been compiled at RENCI [4] [5], available as netCDF (.nc) files totaling 8TB. These can be browsed, subsetted, visualized, and downloaded (see [6] [7] [8]). In addition to these output files, we have uploaded to this HydroShare resource the input parameter files needed to re-run the NWM for the Harvey period, or for any time period covered by NWM v1.1 and 1.2 (August 2016 to this publication date in August 2018). These parameter files are also made available at [1]. See README for further details and usage guidance. Please see NOAA contacts listed on [1] for questions about the NWM data contents, structure and formats. Contact [e-mail] if any questions about HydroShare-based tools and data access. References [1] Overview of the NWM framework and output files [http://water.noaa.gov/about/nwm] [2] Free access to all National Water Model output for the most recent two days [ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/nwm] [3] NWM outputs for rolling 40-day window, maintained by HydroShare [http://thredds.hydroshare.org/thredds/catalog/nwm/catalog.html] [4] Archived Harvey NWM outputs via RENCI THREDDS server [http://thredds.hydroshare.org/thredds/catalog/nwm/harvey/catalog.html] [5] RENCI is an Institute at the University of North Carolina at Chapel Hill [6] Live map for National Water Model forecasts [http://water.noaa.gov/map] [7] NWM Forecast Viewer app [https://hs-apps.hydroshare.org/apps/nwm-forecasts] [8] CUAHSI JupyterHub example scripts for subsetting NWM output files [https://hydroshare.org/resource/3db192783bcb4599bab36d43fc3413db/] [9] WRF-Hydro Overview [https://ral.ucar.edu/projects/wrf_hydro/overview] [10] WRF-Hydro User Guide 2015 [https://ral.ucar.edu/sites/default/files/public/images/project/WRF_Hydro_User_Guide_v3.0.pdf]国家水模型（National Water Model, NWM）是由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）国家气象局下属的国家水中心（National Water Center, NWC）运营的水情预报模型。NWM持续对美国本土270万条河段、总长320万英里的溪流与河道开展流量预报[1]。该模型作为国家天气预报系统的组成部分运行，输入数据源自NOAA数值天气预报模型，以及美国地质调查局国家水信息系统观测得到的天气与水情数据。NWM背后的计算框架参考资料由美国国家大气研究中心（National Center for Atmospheric Research, NCAR）发布[9][10]。 NWC针对美国本土（Continental United States, CONUS）生成多预报时效、多时间步长的NWM河道流量预报。受输出文件体量限制，单次可下载的预报数据通常仅能覆盖数天范围[2]。不过，RENCI下属的HydroShare维护了一个时长为40天的滚动窗口预报数据集[3]，同时还保留了NWM分析与同化输出的完整回溯数据集（2016年8月至今），如需获取该数据集权限可联系[e-mail]。 RENCI已汇编2017年8月18日至9月10日期间的全部NWM预报档案[4][5]，该档案以netCDF（.nc）格式存储，总容量达8TB。用户可对其进行浏览、子集选取、可视化与下载操作（详见[6][7][8]）。除上述输出文件外，本次我们还在该HydroShare资源中上传了可重新运行NWM的输入参数文件，支持哈维飓风时期的模拟，或NWM v1.1与v1.2覆盖的任意时段（2016年8月至2018年8月本文发布之时）。此类参数文件同样可通过[1]获取。 更多细节与使用指南请参阅README文档。若需咨询NWM数据内容、结构与格式相关问题，请联系[1]中列出的NOAA对接人员。若对基于HydroShare的工具与数据访问存在疑问，请联系[e-mail]。 参考文献 [1] NWM框架与输出文件概述 [http://water.noaa.gov/about/nwm] [2] 最新两日全量国家水模型输出数据免费获取 [ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/nwm] [3] RENCI维护的40天滚动窗口NWM输出数据集 [http://thredds.hydroshare.org/thredds/catalog/nwm/catalog.html] [4] RENCI THREDDS服务器上的哈维飓风时期NWM归档输出数据 [http://thredds.hydroshare.org/thredds/catalog/nwm/harvey/catalog.html] [5] RENCI为北卡罗来纳大学教堂山分校下属研究所 [6] 国家水模型预报实时地图 [http://water.noaa.gov/map] [7] NWM预报查看器应用 [https://hs-apps.hydroshare.org/apps/nwm-forecasts] [8] CUAHSI JupyterHub用于NWM输出文件子集选取的示例脚本 [https://hydroshare.org/resource/3db192783bcb4599bab36d43fc3413db/] [9] WRF-Hydro概述 [https://ral.ucar.edu/projects/wrf_hydro/overview] [10] WRF-Hydro 2015用户指南 [https://ral.ucar.edu/sites/default/files/public/images/project/WRF_Hydro_User_Guide_v3.0.pdf]