Last 3 Days Observed (inches)

<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）下属的13个河流预报中心（River Forecast Centers, RFC）会为各自负责的辖区生成定量降水估计（Quantitative Precipitation Estimation, QPE）产品。各河流预报中心采用多传感器融合方案生成该数据，所用数据源包括NWS 88D多普勒雷达降水估计数据、自动与人工降水雨量计数据以及卫星降水估计产品。上述QPE数据会作为输入接入水文模型，用于生成美国国家气象局的河流预报及相关指导类产品。各RFC生成的QPE数据会被整合为单张镶嵌图，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“过去X小时”的产品）包含对应标注时段内的观测数据。此类产品每小时更新一次，以纳入最新的观测数据。
单日数据产品（包括“今日观测分析”、标注为“过去X日观测”以及“X至今观测”的产品）代表的是对应日期UTC 12时结束的24小时降水总量。随后可将这些24小时降水总量累加，生成多日降水累计总量。项目组还会结合PRISM气候组（PRISM Climate Group）的观测数据，生成“今日观测分析”产品以及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对比，还可得到降水距平百分率与降水距平差值两类对比数据。每日数据会在每日UTC 12时至21时之间，根据最新获取的观测数据进行多次更新。
图形化网页链接：https://water.weather.gov/precip/index.php
数据下载链接（高级水文预报服务（Advanced Hydrologic Predictive Services, AHPS）降水下载页面）：https://water.weather.gov/precip/download.php
元数据链接：
观测数据元数据：https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml
正常降水量元数据：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
若对该服务有疑问或建议，请联系DISS GIS团队（邮箱：[e-mail]）

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