National Weather Service 72 Hour Temperature Forecast

This map displays the Apparent and Expected Air Temperature forecast over the next 72 hours across the Contiguous United States, Alaska, Guam, Hawaii, and Puerto Rico in 3 hour increments. The original raster data has been processed into 1-degree contours. Two layers are included: apparent and expected temperature, both include a Time Series set to a 3-hour time interval. The apparent temperature is the perceived (or feels like) temperature derived from either a combination of temperature and wind (wind chill) or temperature and humidity (heat index) for the indicated hour. When the temperature at a particular grid point falls to 50 °F or less, wind chill will be used for that point for the apparent temperature. When the temperature at a grid point rises above 80 °F, the heat index will be used for apparent temperature. Between 51 and 80 °F, the apparent temperature will be the ambient air temperature. The expected temperature is the forecasted ambient air temperature in °F. See sister data product for Min and Max Daily Temperatures Revisions May 1, 2026: Added field descriptions and value types. Sep 1, 2022: Updated renderer Arcade logic on layers to correctly symbolize on values greater than 120 and less than -60 degrees. Apr 22, 2022: Set 'Apparent Temperature' layer visibility to True by default, so content is visible when initially viewed. Apr 21, 2022: Added Forecast Period Number 'Interval' field for an alternate query method to the Timeline of data. Disabled Time Series by default to improve initial Map Viewer exprience and added a Filter for 'interval = 1' to display initial forecast time data (current time period). Detail Service Data update interval is: Hourly Where is the data coming from? The National Digital Forecast Database (NDFD) was designed to provide access to weather forecasts in digital form from a central location. The NDFD produces gridded forecasts of sensible weather elements. NDFD contains a seamless mosaic of digital forecasts from National Weather Service (NWS) field offices working in collaboration with the National Centers for Environmental Prediction (NCEP). All of these organizations are under the administration of the National Oceanic and Atmospheric Administration (NOAA). Apparent Temperature Source: CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.apt.bin ALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.apt.bin HAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.apt.bin GUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.apt.bin PUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.apt.bin Expected Temperature Source: CONUS: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.temp.bin ALASKA: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.temp.bin HAWAII: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.temp.bin GUAM: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.temp.bin PUERTO RICO: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.temp.bin Where can I find other NDFD data? The Source data is downloaded and parsed using the Aggregated Live Feeds methodology 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. What can you do with this layer? This feature 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 or add a Filter using the 'Forecast Period Number'. This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency. If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page.本地图展示了美国本土48州、阿拉斯加、关岛、夏威夷及波多黎各未来72小时内，以3小时为步长的表观气温与预报环境气温预报数据。原始栅格数据已被处理为1度间隔等值线。本数据集包含两个图层：表观气温图层与预报环境气温图层，二者均内置了设置为3小时间隔的时间序列（Time Series）。 表观气温即体感温度，是根据对应时刻的气温与风速（风寒指数（wind chill））或气温与湿度（热感受指数（heat index））组合计算得到的体感温度。当特定网格点的气温降至50华氏度及以下时，该点的表观气温将采用风寒指数计算；当网格点气温高于80华氏度时，表观气温将采用热感受指数计算；当气温处于51至80华氏度区间时，表观气温直接等同于环境气温。 预报环境气温即为预报得到的环境气温，单位为华氏度。 ### 版本修订记录 2026年5月1日修订：新增字段说明与数值类型说明。 2022年9月1日修订：更新图层的Arcade渲染逻辑，以正确对高于120华氏度、低于-60华氏度的数值进行符号化展示。 2022年4月22日修订：将‘表观气温’图层的默认可见性设为开启，确保初始加载时即可查看图层内容。 2022年4月21日修订：新增预报期数‘间隔’字段，为数据时间线提供另一种查询方式；默认禁用时间序列以优化地图查看器的初始加载体验，并添加‘间隔=1’过滤器，用于展示初始预报时段（当前时刻）的数据。 ### 服务更新频率 本服务的数据更新频率为：每小时一次。 ### 数据来源说明 本数据集的数据源自国家数字预报数据库（National Digital Forecast Database, NDFD），该库旨在通过中央节点提供数字化气象预报数据。NDFD可生成气象要素的格点预报产品，其数据集合由美国国家气象局（National Weather Service, NWS）野外办公室与国家环境预报中心（National Centers for Environmental Prediction, NCEP）联合产出的数字化预报无缝拼接而成。上述所有机构均隶属于美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）。 #### 表观气温数据源 美国本土48州：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.apt.bin 阿拉斯加：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.apt.bin 夏威夷：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.apt.bin 关岛：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.apt.bin 波多黎各：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.apt.bin #### 预报环境气温数据源 美国本土48州：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.conus/VP.001-003/ds.temp.bin 阿拉斯加：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.alaska/VP.001-003/ds.temp.bin 夏威夷：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.hawaii/VP.001-003/ds.temp.bin 关岛：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.guam/VP.001-003/ds.temp.bin 波多黎各：https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndfd/AR.puertori/VP.001-003/ds.temp.bin ### 其他NDFD数据获取方式 本数据集的源数据通过聚合实时馈源方法进行下载与解析，产出的数据可通过ArcGIS Server发布为地图服务，或用于更新ArcGIS在线版与企业版中的托管要素服务（Hosted Feature Services）。 ### 图层使用说明 该要素服务适用于数据探索与可视化展示。用户可通过点击地图识别要素，查看预配置的弹窗信息；可启用时间动画功能，通过时间滑块查看支持时间维度的数据，或通过‘预报期数’字段添加过滤器进行筛选。 本地图仅供信息参考用途，未进行7×24小时的准确性与时效性监控。若您希望接收潜在问题告警，或仅需查看本服务的下一次更新时间，请访问我们的实时馈源状态页面。