US Counties

This feature service depicts the National Weather Service (NWS) watches, warnings, and advisories within the United States. Watches and warnings are classified into well over 100 categories. See event descriptions for full details. A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. A warning means weather conditions pose a threat to life or property. People in the path of the storm need to take protective action. A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. It is intended to provide enough lead time so those who need to set their plans in motion can do so. A watch means that hazardous weather is possible. People should have a plan of action in case a storm threatens, and they should listen for later information and possible warnings especially when planning travel or outdoor activities. An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. Advisories are for less serious conditions than warnings, that cause significant inconvenience and if caution is not exercised, could lead to situations that may threaten life or property. Source National Weather Service RSS-CAP Warnings and Advisories: Public Alerts National Weather Service Boundary Overlays: AWIPS Shapefile Database Sample Data See Sample Layer Item for sample data during Weather inactivity! Update Frequency The services is updated every 5 minutes using the Aggregated Live Feeds methodology. The overlay data is checked and updated daily from the official AWIPS Shapefile Database. Area Covered United States and Territories What can you do with this layer? Customize the display of each attribute by using the Change Style option for any layer. Query the layer to display only specific types of weather watches and warnings. Add to a map with other weather data layers to provide insight on hazardous weather events. Use ArcGIS Online analysis tools, such as Enrich Data, to determine the potential impact of weather events on populations. Revisions Dec 2, 2025: Event ‘link’ updated to use ‘api.weather.gov’ address for More Information. Oct 10, 2025: Removed propagation of events w/status of “Test”. Applied Symbology update from Mar 10, 2025, removing “Test” classification. Aug 13, 2025: Exposed "Observed Threat Damage Level" field supporting Damage Indicators of "CONSIDERABLE", "DESTRUCTIVE", and "CATASTROPHIC". Jan 22, 2025: Exposed "Hours Old" fields supporting last "Updated", "Effective", and "Expiration" as +- age values for events. Jan 19, 2025: Added event "Description" and "Instructions", updated Pop-up. Feb 16, 2024: Revised event link to accomodate change in alert search endpoint. Feb 1, 2024: Revised to leverage CAP v1.2 source endpoint. Update event link to use alert search. Apr 17, 2023: Turned off popups for boundary Layers by default. Mar 3, 2021: Revised data processing to leverage VTEC parameter details to better align Event "effective" dates with reported dates on Alert pages. Feb 25, 2021: Revised service data upate workflow, improving stability and update interval. Process now checks for data updates every 5 minutes! 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!