Boundary

<span style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The 13 Weather Service (NWS) River Forecast Centers (RFC) produce Quantitative Precipitation Estimates (QPE) for their individual RFC areas. The RFCs produce the data using a multi-sensor approach utilizing NWS 88D radar estimates of precipitation, automated and manual precipitation gauges and satellite estimates of precipitation. These QPEs are used as input into their hydrologic models to produce NWS river forecasts and guidance products. The QPEs from each RFC are combined into a single mosaic to create a QPE product that covers the lower 48 states, Alaska and Puerto Rico. These QPE 's measuring units are in inches. The data are on an approximate 4km x 4km grid cell scale. </span><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The individual hourly data products (labeled Since 12Z Observed and those labeled Last X hours) contain data for the labeled time frame. These products are updated every hour to incorporate the most recent data.</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>The individual daily data products (Today's Analysis Observed, those labeled Last X Days Observed, and those labeled X To Date Observed.) represent a 24 hour total ending at 12UTC on the indicated date. These 24-hour data are then summed together to produce multi-day precipitation totals. Normal precipitation data are also produced for the Today's Analysis Observed and multi-day summations of 7 days or greater using data from the PRISM Climate Group. Percent of normal and departure from normal comparisons are also available by comparing the QPE data with the PRISM normal data. The daily data may be updated several times between 12UTC and 21UTC each day as updated data becomes available.</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Link to graphical web page: <a href='https://water.weather.gov/precip/index.php' rel='nofollow ugc'>https://water.weather.gov/precip/index.php</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Link to data download (Advanced Hydrologic Predictive Services (AHPS) Precipitation Downloads): <a href='https://water.weather.gov/precip/download.php' rel='nofollow ugc'>https://water.weather.gov/precip/download.php</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Links to metadata:</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml' rel='nofollow ugc'>Observed</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/NormalPrecip.xml' rel='nofollow ugc'>Normal</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml' rel='nofollow ugc'>Departure from Normal</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><a href='https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml' rel='nofollow ugc'>Percent of Normal Precipitation</a></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>Questions/Concerns about the service, please contact the <a href='mailto:[e-mail]' rel='nofollow ugc'>DISS GIS</a> team</p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'><span style='font-weight:bold;'>Time Information:</span></p><p style='color:rgb(0, 0, 0); font-family:Verdana, Arial, Helvetica, sans-serif; font-size:14.399999618530273px;'>This service is not time enabled</p>

美国国家气象局（National Weather Service, NWS）下辖的13个河流预报中心（River Forecast Centers, RFC）会为各自管辖的辖区生成定量降水估计（Quantitative Precipitation Estimates, QPE）产品。各RFC采用多传感器融合技术生成此类数据，所用数据源涵盖NWS 88D雷达降水估测数据、自动与人工雨量计观测数据以及卫星降水估测数据。上述QPE产品将作为输入参数接入水文模型，用于生成NWS河流预报及相关指导产品。各RFC产出的QPE数据会被拼接为一幅整体镶嵌图，以此生成覆盖美国本土48州、阿拉斯加州以及波多黎各的全域QPE产品。该QPE产品的计量单位为英寸，数据采用近似4km×4km的网格单元尺度。

逐小时数据产品（包括标注为“自12Z起观测”以及“过去X小时”的产品）包含对应时段内的观测数据。此类产品每小时更新一次，以纳入最新的观测资料。

逐日数据产品（包括“当日分析观测”、标注为“过去X日观测”以及“X至当日观测”的产品）代表对应日期12Z结束的24小时降水总量。随后可将这些24小时总量进行累加，生成多日降水累计总量。此外，团队还会结合PRISM气候集团（PRISM Climate Group）的气候基准数据，生成“当日分析观测”以及7日及以上时长的多日累计降水的气候正常值数据。通过将QPE数据与PRISM气候正常值数据进行比对，还可得到降水距平百分率与降水距平值。每日数据会在每日12Z至21Z之间根据新增的观测资料进行多次更新。

可视化网页链接：<a href='https://water.weather.gov/precip/index.php' rel='nofollow ugc'>https://water.weather.gov/precip/index.php</a>

数据下载链接（高级水文预报服务（Advanced Hydrologic Predictive Services, AHPS）降水数据下载）：<a href='https://water.weather.gov/precip/download.php' rel='nofollow ugc'>https://water.weather.gov/precip/download.php</a>

元数据链接：
- 观测降水元数据：<a href='https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml' rel='nofollow ugc'>https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml</a>
- 气候正常值降水元数据：<a href='https://water.weather.gov/precip/metadata/NormalPrecip.xml' rel='nofollow ugc'>https://water.weather.gov/precip/metadata/NormalPrecip.xml</a>
- 降水距平元数据：<a href='https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml' rel='nofollow ugc'>https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml</a>
- 降水距平百分率元数据：<a href='https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml' rel='nofollow ugc'>https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml</a>

若对该服务存在疑问或建议，请联系DISS GIS团队，联系邮箱：<a href='mailto:[e-mail]' rel='nofollow ugc'>[e-mail]</a>

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