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, for a time a 40-day rolling window of these forecasts was 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 [http://water.noaa.gov/about/nwm - scroll down to links under "Downloading Output"]
[3] NWM outputs for rolling 40-day window, maintained by HydroShare [link is no longer available]
[4] Archived Harvey NWM outputs via RENCI THREDDS server [http://thredds.hydroshare.org/thredds/catalog/nwm/harvey/catalog.html] [link is no longer accessible]
[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 [no longer available]
[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]

国家水文模型（NWM）是由美国国家海洋与大气管理局（NOAA）国家气象服务中心下属的国家水文中心（NWC）运营的水文预报模型。NWM持续对覆盖美国大陆3.2百万英里河流和溪流的270万个溪流段进行流量预报[1]。该模型作为国家天气预报系统的一部分运行，其输入数据来源于NOAA数值天气预报模型，以及通过美国地质调查局国家水文信息系统观测到的天气和水文条件。NWM背后的计算框架的参考资料由美国科罗拉多州立大学国家大气研究中心（NCAR）发布[9][10]。

国家水文中心为美国大陆（CONUS）生成NWM流量预报，包含多个预报范围和时间段。由于输出文件的大小，这些数据通常无法一次下载超过两天[2]。然而，HydroShare在RENCI维护了一个为期40天的滚动窗口预报[3]，同时，NWM分析与同化输出的完整回溯（自2016年8月至现在）也得以保存（如需访问，请联系[e-mail]）。

RENCI已汇编了2017年8月18日至9月10日期间的所有NWM预报数据，以总容量达8TB的netCDF（.nc）文件形式提供，这些文件可供浏览、子集、可视化和下载（参见[6][7][8]）。除了这些输出文件外，我们还上传了用于重新运行NWM以模拟哈维时期或NWM v1.1和v1.2（自2016年8月至本出版日期的2018年8月）覆盖的任何时间段的输入参数文件。这些参数文件也已在[1]中提供。

请参阅README以获取更多详细信息和使用指南。有关NWM数据内容、结构和格式的疑问，请参阅[1]中列出的NOAA联系方式。如对基于HydroShare的工具和数据访问有任何疑问，请联系[e-mail]。

参考文献
[1] NWM框架及输出文件概述 [http://water.noaa.gov/about/nwm]
[2] 对最近两天内所有国家水文模型输出数据的免费访问 [http://water.noaa.gov/about/nwm - 滚动至“下载输出”下的链接]
[3] HydroShare维护的滚动40天窗口的NWM输出 [链接已不可用]
[4] 通过RENCI THREDDS服务器存档的哈维NWM输出 [http://thredds.hydroshare.org/thredds/catalog/nwm/harvey/catalog.html] [链接已不可用]
[5] RENCI是位于北卡罗来纳大学教堂山分校的一个研究所
[6] 国家水文模型预报的实时地图 [http://water.noaa.gov/map]
[7] NWM预报查看器应用程序 [已不再可用]
[8] CUAHSI JupyterHub示例脚本，用于子集NWM输出文件 [https://hydroshare.org/resource/3db192783bcb4599bab36d43fc3413db/]
[9] WRF-Hydro概述 [https://ral.ucar.edu/projects/wrf_hydro/overview]
[10] WRF-Hydro用户指南2015 [https://ral.ucar.edu/sites/default/files/public/images/project/WRF_Hydro_User_Guide_v3.0.pdf]

搜集汇总

背景与挑战

背景概述

该数据集由NOAA National Water Center创建，包含国家水模型（NWM）在2017年Harvey飓风期间的流量预测数据，数据格式为netCDF，总大小为11.1 GB。数据集还提供了输入参数文件和相关的用户指南，支持模型重新运行和进一步研究。