Footprint

<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）数据。各RFC采用多传感器融合方案生成此类数据，融合数据源包括NWS 88D天气雷达降水估测结果、自动与人工雨量计观测数据以及卫星降水估测产品。上述QPE数据将作为输入接入水文模型，用于生成NWS河流预报及相关指导产品。各RFC产出的QPE数据会被整合为单张全域镶嵌图，形成覆盖美国本土48州、阿拉斯加州及波多黎各的完整QPE产品。该QPE数据的计量单位为英寸，网格分辨率约为4km×4km。

按小时产出的单份数据产品（标注为“自12Z起观测”及“过去X小时”类产品）包含对应时段内的观测数据，此类产品每小时更新一次以纳入最新观测资料。

按日生成的单份数据产品（包括“今日观测分析”、“过去X天观测”及“X至当日观测”类产品）代表对应日期12世界协调时（UTC）结束的24小时降水总量。将这些24小时降水总量累加，即可得到多日累计降水总量。针对“今日观测分析”产品以及时长为7天及以上的多日累计降水数据，还会结合PRISM气候小组（PRISM Climate Group）的基准降水数据集生成对应时段的正常降水量数据。通过将QPE实测数据与PRISM基准降水数据进行对比，还可生成降水距平百分率与降水距平值两类对比产品。每日数据会在每日12UTC至21UTC之间，根据最新可用观测资料多次更新。

图形网页链接：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：
观测数据元数据：https://water.weather.gov/precip/metadata/DailyObservedPrecip.xml
基准降水量元数据：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

若对本服务存在疑问或建议，请联系DISS GIS团队，邮箱为[e-mail]

时间信息：
本服务未启用时间相关功能。