Accumulation by Time

<p>This map displays the <a target='_blank' href='https://vlab.noaa.gov/web/mdl/ndfd-information-links' rel='nofollow ugc noopener noreferrer'><strong>Quantitative Precipitation Forecast (QPF)</strong></a> for the next 72 hours across the contiguous United States, Alaska, Hawaii, and Puerto Rico. Data are updated hourly from the <a target='_blank' href='https://vlab.noaa.gov/web/mdl/ndfd' rel='nofollow ugc noopener noreferrer'><strong>National Digital Forecast Database</strong></a> produced by the National Weather Service.<br /><br />The dataset includes incremental and cumulative precipitation data in 6-hour intervals. In the ArcGIS Online map viewer you can enable the time animation feature and select either the "Amount by Time" (incremental) layer or the "Accumulation by Time" (cumulative) layer to view a 72-hour animation of forecast precipitation. All times are reported according to your local time zone.<br /><br /><span style='font-size:medium;'><strong>Where is the data coming from?</strong></span></p><p><a target='_blank' href='https://vlab.noaa.gov/web/mdl/ndfd' rel='nofollow ugc noopener noreferrer'><strong>The National Digital Forecast Database (NDFD)</strong></a> was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces forecast data of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from <a target='_blank' href='https://www.weather.gov/' rel='nofollow ugc noopener noreferrer'><strong>National Weather Service (NWS)</strong></a> field offices working in collaboration with the <a target='_blank' href='https://www.weather.gov/ncep/' rel='nofollow ugc noopener noreferrer'><strong>National Centers for Environmental Prediction (NCEP)</strong></a>. All of these organizations are under the administration of the <a target='_blank' href='https://www.noaa.gov/' rel='nofollow ugc noopener noreferrer'><strong>National Oceanic and Atmospheric Administration (NOAA)</strong></a>.<br /><br /><strong>Source:</strong></p><ul><li><div>CONUS:<strong>&nbsp;</strong><a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>ALASKA: <a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>HAWAII: <a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>GUAM: <strong>Not Available</strong></div></li><li><div>PUERTO RICO:&nbsp;<a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.qpf.bin</strong></a></div></li></ul><div>&nbsp;</div><div><span style='font-size:medium;'><strong>Where can I find other </strong></span><a target='_blank' href='https://vlab.noaa.gov/web/mdl/ndfd-degrib-data-loc' rel='nofollow ugc noopener noreferrer'><span style='font-size:medium;'><strong>NDFD</strong></span></a><span style='font-size:medium;'><strong> data?</strong></span><br /><br />The Source data is downloaded and parsed using the <a target='_blank' href='https://www.esriurl.com/LiveFeed' rel='nofollow ugc noopener noreferrer'><strong>Aggregated Live Feeds methodology</strong></a> to return information that can be served through ArcGIS Server as a map service or used to update Hosted Feature Services in Online or Enterprise.<br /><br /><span style='font-size:medium;'><strong>What can you do with this layer?</strong></span></div><div><div>&nbsp;</div><div>This map service is suitable for data discovery and visualization. Identify features by clicking on the map to reveal the pre-configured pop-ups. View the time-enabled data using the time slider by Enabling Time Animation.</div><div>&nbsp;</div><div><span style='font-size:18px;'><strong>Revisions</strong></span></div><ul><li><div><strong>Jan 25, 2026</strong>: Added data for Alaska, Hawaii, and Puerto Rico identified by ‘region’ field for filtering.</div></li></ul><div>&nbsp;</div><div><p><span style='color:rgb(128,128,128);'><i>This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.</i></span></p><p>If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our <a target='_blank' href='https://livingatlas.arcgis.com/livefeeds-status/' rel='nofollow ugc noopener noreferrer'><strong>Live Feed Status</strong></a> Page!</p></div></div>

<p>本地图展示了覆盖美国本土（CONUS）、阿拉斯加、夏威夷及波多黎各的未来72小时<strong>定量降水预报（Quantitative Precipitation Forecast, QPF）</strong>，数据由美国国家气象局出品的<strong>国家数字预报数据库（National Digital Forecast Database, NDFD）</strong>每小时更新一次。</p><p>该数据集包含每6小时间隔的增量与累积降水数据。在ArcGIS Online地图查看器中，你可启用时间动画功能，并选择「逐时段降水量（增量）」图层或「累积降水量（累积）」图层，以查看72小时的预报降水动画。所有时间均按照本地时区显示。</p><p><span style='font-size:medium;'><strong>数据来源何处？</strong></span></p><p><strong>国家数字预报数据库（NDFD）</strong>旨在从中央节点提供数字化天气预报的访问途径。NDFD可生成各类气象要素的预报数据，其包含由<strong>美国国家气象局（National Weather Service, NWS）</strong>基层办公室与<strong>国家环境预报中心（National Centers for Environmental Prediction, NCEP）</strong>协作产出的无缝数字化预报拼图。上述所有机构均隶属于<strong>美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）</strong>。</p><p><strong>数据源链接：</strong></p><ul><li><div>美国本土（CONUS）：<a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>阿拉斯加：<a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>夏威夷：<a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.qpf.bin</strong></a></div></li><li><div>关岛：暂未提供</div></li><li><div>波多黎各：<a target='_blank' href='https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.qpf.bin' rel='nofollow ugc noopener noreferrer'><strong>https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.qpf.bin</strong></a></div></li></ul><div>&nbsp;</div><div><span style='font-size:medium;'><strong>我可以在哪里获取其他NDFD数据？</strong></span><br /><br />本数据集通过<strong>聚合实时源方法（Aggregated Live Feeds methodology）</strong>下载并解析，所得信息可通过ArcGIS Server发布为地图服务，或用于更新在线版或企业版托管要素服务。</div><div><span style='font-size:medium;'><strong>该图层可用于哪些场景？</strong></span></div><div><div>&nbsp;</div><div>本地图服务适用于数据发现与可视化。点击地图即可识别要素并查看预配置的弹窗信息。通过启用时间动画功能，使用时间滑块查看支持时间维度的数据。</div><div>&nbsp;</div><div><span style='font-size:18px;'><strong>更新记录</strong></span></div><ul><li><div>2026年1月25日：新增阿拉斯加、夏威夷及波多黎各的数据，新增「区域」字段用于筛选。</div></li></ul><div>&nbsp;</div><div><p><span style='color:rgb(128,128,128);'><i>本地图仅用于信息展示，未进行全天候的准确性与时效性监控。</i></span></p><p>若你希望接收潜在问题的提醒，或了解本服务的下次更新时间，请访问我们的<a target='_blank' href='https://livingatlas.arcgis.com/livefeeds-status/' rel='nofollow ugc noopener noreferrer'><strong>实时源状态（Live Feed Status）</strong></a>页面！</p></div>