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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）会为各自管辖的RFC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该数据，融合了NWS 88D雷达降水估计数据、自动与人工雨量计观测数据，以及卫星降水反演数据。此类QPE产品会作为输入接入其水文模型，用于生成NWS河流预报及指导类产品。各RFC产出的QPE数据会被整合为一张全域镶嵌图，生成覆盖美国本土48州、阿拉斯加州及波多黎各的QPE产品。该QPE数据的计量单位为英寸，网格尺度约为4km×4km。

逐小时数据产品（包括标注为"自12Z起观测"以及标注为"过去X小时"的产品）包含对应标注时段的降水数据。此类产品每小时更新一次，以纳入最新观测数据。

每日数据产品（包括"当日实测分析"、标注为"过去X日实测"以及"当日至今实测"的产品）代表的是对应日期12世界协调时（Coordinated Universal Time, UTC）结束的24小时降水总量。后续可将这些24小时总量累加，生成多日降水累计值。此外，针对"当日实测分析"以及7日及以上时长的多日累加数据，还会结合PRISM气候集团（PRISM Climate Group）的气候正常值数据集生成对应正常值降水产品。通过将QPE数据与PRISM气候正常值数据进行对比，还可生成降水距平百分率及距平值对比结果。每日数据会在每日12UTC至21UTC期间，根据最新可用数据多次更新。

图形化网页链接：<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（高级水文预测服务（Advanced Hydrologic Predictive Services, AHPS）降水下载）：<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：

<a href='https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml' rel='nofollow ugc'>实测降水元数据</a>

<a href='https://water.weather.gov/precip/metadata/NormalPrecip.xml' rel='nofollow ugc'>正常值降水元数据</a>

<a href='https://water.weather.gov/precip/metadata/DepartFromNormalPrecip.xml' rel='nofollow ugc'>降水距平元数据</a>

<a href='https://water.weather.gov/precip/metadata/PercentOfNormalPrecip.xml' rel='nofollow ugc'>降水距平百分率元数据</a>

若对本服务存在疑问或意见，请联系<a href='mailto:[e-mail]' rel='nofollow ugc'>DISS GIS团队</a>

<b>时间信息：</b>

本服务未启用时间相关功能。