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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）下设的13个河流预报中心（River Forecast Centers, RFC）会为各自管辖区域生成定量降水估计（Quantitative Precipitation Estimation, QPE）产品。各RFC采用多传感器融合方案生成此类数据，具体涵盖NWS 88D多普勒雷达降水估测、自动与人工雨量计观测数据以及卫星降水估测结果。上述QPE产品将作为输入驱动其水文模型，进而生成美国国家气象局的河流预报及相关指导产品。各RFC产出的QPE数据会被整合为单幅镶嵌图，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。该产品的计量单位为英寸，数据采用约4km×4km的网格单元尺度。

逐小时数据产品（标注为「自12Z起观测」及「过去X小时」类产品）包含对应标注时段内的降水数据，此类产品每小时更新一次以纳入最新观测资料。

逐日数据产品（包括「今日观测分析」「过去X日观测」以及「X日至今观测」类产品）代表对应日期协调世界时12UTC截止的24小时降水总量。将这些24小时降水总量累加，即可得到多日降水累计总量。此外，团队还基于PRISM气候组的观测数据，生成了「今日观测分析」以及7日及以上多日累加序列的常年降水量数据。通过将QPE数据与PRISM常年降水量数据进行比对，还可得到降水距平百分率以及降水量距平值。逐日数据会在每日12UTC至21UTC期间，根据新获取的观测资料多次更新。

可视化网页链接：https://water.weather.gov/precip/index.php

数据下载链接（高级水文预测服务（Advanced Hydrologic Predictive Services, AHPS）降水下载页面）：https://water.weather.gov/precip/download.php

元数据链接：

观测降水元数据：https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml

常年降水元数据：https://water.weather.gov/precip/metadata/NormalPrecip.xml

降水距平元数据：https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml

降水距平百分率元数据：https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml

若对该服务存在疑问或建议，请联系DISS GIS团队，邮箱：[e-mail]

时间信息：本服务未启用时间相关功能。