alerts.weather.govNWS Public Alerts in XML/CAP v1.1 and ATOM Formats - NOAA's National Weather Service

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Weather-Ready Nation NWS on Facebook NWS Director Jack Hayes on Twitter NWS on Twitter NWS on YouTube Home > NWS Public Alerts in XML/CAP and ATOM Formats Overview This page provides guidance on the use of and access to NWS watches, warnings, advisories, and other similar products in the Common Alerting Protocol ( CAP ) and Atom Syndication Format ( ATOM ). Information below refers to CAP v1.1 except for the Transition from CAP v1.1 to v1.2 section immediately below and the Technical Notes about the NWS CAP v1.2 Messages and Methods to get NWS CAP v1.2 Messages sections near the bottom of the page. Transition from CAP v1.1 to v1.2 NWS CAP v1.2 will be available from more sources, will simplify alert tracking, and have improved documentation. The NWS is far along in a yearlong process to transition CAP messages from CAP v1.1 to v1.2. Watch this page for updates as progress is made and timelines announced. During the transition, there will be an overlap period of 60 days or more when both CAP v1.1 and CAP v1.2 will be supported with CAP messages and associated Atom index feeds. Use of ATOM and CAP with Traditional and Emerging Technologies NWS CAP and ATOM feeds can be used to launch Internet messages, trigger alerting systems, feed mobile device (e.g., cell phone/smart phone and tablet) applications, news feeds, television text captions, highway sign messages, and synthesized voice over automated telephone calls or radio broadcasts. CAP Overview CAP is an XML-based information standard used to facilitate emergency information sharing and data exchange across local, state, tribal, national and non-governmental organizations of different professions that provide emergency response and management services. NWS CAP messages are produced in the CAP v1.1 format defined by the Organization for the Advancement of Structured Information Standards (OASIS). Developers and re-packagers of NWS CAP messages should review the Technical Notes about the NWS CAP 1.1 Messages. ATOM Overview ATOM is an XML based document format for syndicating news and other timely news-like information. The NWS ATOM feeds act as an index for active CAP messages by state, county, and NWS forecast zones to aid the automated dissemination of this information. ATOM provides headlines, URLs to the source document and brief description information in an easy to understand and use format. Software libraries exist to read the ATOM format and present ATOM headlines on webpages, personal computer workstations, and mobile devices. For consumers of these feeds as indexes to the CAP messages, the ATOM feeds contain several CAP data fields to assist in the tracking of available CAP messages with the goal of reducing the need to query the complete CAP message at every refresh. Navigating to the NWS CAP and ATOM Feeds This page leverages the ATOM feed as an index to help you find active CAP messages for a given state, county, or NWS forecast zone. Developers and re-packagers of NWS alerts should note that each ATOM feed contains several CAP data fields to assist in the tracking of available CAP messages with the goal of reducing the need to query the complete CAP message at every refresh. Select any state to see a list of alerts for that state (note: you may subscribe to one of the state ATOM feeds by selecting the ATOM logo in the second column). Alternatively, you may select from the "By County/Zone" column to select from a list of counties or NWS forecast. In many locations, the forecast zones roughly follow county lines. The resulting page is the ATOM feed reformatted for your web browser using a custom Extensible Stylesheet Language (XSL) style sheet and lists all active CAP messages (i.e., alerts) for the respective area. XSL describes how files encoded in the XML standard are to be formatted or transformed for display by your web browser. The actual ATOM Feed can be viewed by viewing the page source (e.g., right click on browser and click View Page Source). To view the details of an alert, select the name or issued/expiring time of the alert. The resulting page is the CAP message of the alert reformatted for your web browser using a second custom XSL style sheet . The actual CAP message can be viewed by viewing the page source. The ATOM and CAP feeds are updated about every two minutes. More information on NWS CAP and ATOM feeds is available in the Service Description Document for NWS Watches, Warnings, and Advisories using CAP and ATOM based Formats . A | C | D | F | G | H | I | K | L | M | N | O | P | R | S | T | U | V | W | -- U.S. -- State (Zone List | County List) ATOM National (all) Alabama -- ( Zone List | County List ) Alaska -- ( Zone List | County List ) America Samoa -- ( Zone List | County List ) Arizona -- ( Zone List | County List ) Arkansas -- ( Zone List | County List ) California -- ( Zone List | County List ) Colorado -- ( Zone List | County List ) Connecticut -- ( Zone List | County List ) Delaware -- ( Zone List | County List ) District of Columbia -- ( Zone List | County List ) Florida -- ( Zone List | County List ) Georgia -- ( Zone List | County List ) Guam -- ( Zone List | County List ) Hawaii -- ( Zone List | County List ) Idaho -- ( Zone List | County List ) Illinois -- ( Zone List | County List ) Indiana -- ( Zone List | County List ) Iowa -- ( Zone List | County List ) Kansas -- ( Zone List | County List ) Kentucky -- ( Zone List | County List ) Louisiana -- ( Zone List | County List ) Maine -- ( Zone List | County List ) Marianas Maryland -- ( Zone List | County List ) Massachusetts -- ( Zone List | County List ) Michigan -- ( Zone List | County List ) Midway Island Minnesota -- ( Zone List | County List ) Mississippi -- ( Zone List | County List ) Missouri -- ( Zone List | County List ) Montana -- ( Zone List | County List ) Nevada -- ( Zone List | County List ) Nebraska -- ( Zone List | County List ) New Hampshire -- ( Zone List | County List ) New Jersey -- ( Zone List | County List ) New Mexico -- ( Zone List | County List ) New York -- ( Zone List | County List ) North Carolina -- ( Zone List | County List ) North Dakota -- ( Zone List | County List ) Ohio -- ( Zone List | County List ) Oklahoma -- ( Zone List | County List ) Oregon -- ( Zone List | County List ) Pennsylvania -- ( Zone List | County List ) Puerto Rico -- ( Zone List | County List ) Rhode Island -- ( Zone List | County List ) South Carolina -- ( Zone List | County List ) South Dakota -- ( Zone List | County List ) Tennessee -- ( Zone List | County List ) Texas -- ( Zone List | County List ) Utah -- ( Zone List | County List ) Vermont -- ( Zone List | County List ) Virgin Islands -- ( Zone List | County List ) Virginia -- ( Zone List | County List ) Washington -- ( Zone List | County List ) West Virginia -- ( Zone List | County List ) Wisconsin -- ( Zone List | County List ) Wyoming -- ( Zone List | County List ) National (all) Alaska Marine Zones -- ( Zone List ) Atlantic Marine Zones -- ( Zone List ) Great Lakes Marine Zones -- ( Zone List ) Gulf of Mexico Marine Zones -- ( Zone List ) Pacific Marine Zones -- ( Zone List ) Pacific Islands Marine Zones -- ( Zone List ) Marine Zones (all) Techn...