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<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家河流预报中心（River Forecast Centers, RFC）会为各自负责的辖区生成定量降水估计（Quantitative Precipitation Estimates, QPE）产品。各河流预报中心采用多传感器融合技术生成该类数据，融合了NWS 88D多普勒雷达降水反演结果、自动与人工雨量计观测数据以及卫星降水反演结果。此类定量降水估计产品将作为输入参数接入其水文模型，用于生成美国国家气象局的河流预报及指导产品。各河流预报中心生成的QPE数据会被拼接为一幅全域镶嵌图，最终得到覆盖美国本土48州、阿拉斯加州以及波多黎各的统一QPE产品。该产品的降水计量单位为英寸，数据采用近似4km×4km的格网尺度。
各类逐小时数据产品（包含标注为“自12Z起观测”与“过去X小时”的产品）均涵盖对应标注时段的观测数据，此类产品每小时更新一次，以纳入最新的观测资料。
各类逐日数据产品（包括“今日观测分析”、“过去X天观测”以及“当日至今观测”类产品）代表的是对应日期以12世界协调时（UTC）为截止时刻的24小时降水总量。随后可将这些24小时降水总量累加，得到多日累计降水总量。此外，针对“今日观测分析”产品以及7天及以上的多日累计数据，可利用PRISM气候集团（PRISM Climate Group）的气候正常值数据生成对应的标准降水数据。通过将QPE数据与PRISM气候正常值数据进行对比，还可计算降水距平百分率与距平值。每日的逐日数据会在每日12UTC至21UTC之间根据新到的观测资料进行多次更新。
图形化网页链接：https://water.weather.gov/precip/index.php
数据下载（高级水文预报服务（Advanced Hydrologic Predictive Services, AHPS）降水数据下载）：https://water.weather.gov/precip/download.php
元数据链接：
观测降水数据元数据：https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml
标准降水数据元数据：https://water.weather.gov/precip/metadata/NormalPrecip.xml
降水距平数据元数据：https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml
降水距平百分率数据元数据：https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml
如有关于该服务的疑问或意见，请联系DISS GIS团队，邮箱地址为[e-mail]。
时间信息：本服务未启用时间相关功能。