MetAlerts - Weather alerts from the Norwegian Meteorological Institute


This service provides meteorological warnings in CAP format, as well as a listing of current warnings in an RSS 2.0 feed. Both are in XML format, but there is an experimental GeoJSON version in beta.

Alerts are issued on three levels:

Red - Extreme weather with over 50 % probability. These will normally have an issued name, look for incidentName in the CAP file
Orange - Severe weather, or extreme weather with less than 50 % probability
Yellow - Less severe weather, or severe with less than 50 % probabilty

Each CAP message is one of the following types, as indicated in the msgType value:

Alert - warning about a new phenomenon
Update - modifies a previous Alert/Update (which is no longer valid)
Cancel - invalidates a previous Alert/Update

For more information on the CAP format and meanings, see the "other resources" tab.

Output formats


Unless the cap parameter is given, we return an RSS 2.0 feed of alerts.

Tip: Many browsers have removed RSS support and insist on downloading RSS feeds to disk despite being perfectly able to display XML. To avoid this, you can indicate .xml as output format, which will return the corresponding MIME type so it can be displayed in the browser:

GeoJSON format (beta)

Due to user feedback we are working on a supplemental GeoJSON format, where all relevant information is included without the need to open separate CAP files. This is currently considered a beta feature, and not suitable for high volume production as it is rather slow and costly to produce. We do not plan to make any more changes to the GeoJSON format in version 2.0; an official GeoJSON format may possibly be added later in 2024.

This also works for other methods, like all, test, archive and so on.


You can download alerting icons in SVG format (which can be converted to PNG) from the Yr GitHub page:

In the future this icon set will be migrated to the Weathericons GitHub repo as currently used with Locationforecast.



/current - show active alerts

Use the RSS feed to get a list of CAP warnings, optionally filtered by query parameters.

Do not download each CAP file more than once, and certainly not every time you download the RSS feed! (this is liable to getting you throttled). Once issued the CAP file never changes, so it should be downloaded only once and stored locally.

/all - show active and inactive alerts

Normally only active alerts are listed, with expired alerts filtered out. Using /all will list all alerts issued during the last 30 days, both active and inactive.

/archive - historical alerts

This is used to get historical alerts from the archive, which is segmented by monthly intervals. Currently it contains data for the period Jan 2019 to Dec 2023; new periods are added at the start of each year.

Note: All alerts prior to May 2024 follows the v1 CAP profile.

/test - Test alerts

Meteorologists sometimes want to test fictional CAP warnings to check that they work upstream. These can be accessed via RSS at the /test endpoint:

/example - Examples of different alerts

These are examples of test alerts, one for each event type (currently forestFire, blowingSnow, rainFlood, lightning and rainFlood). These don't expire until 2034, so will be available for use in development testing for years to come.



Retrieve CAP XML message with given guid


Output language, currently "no" or "en" for Norwegian and English, respectively


Filter by CAP eventType, legal values are: blowingSnow, forestFire, gale, ice, icing, lightning, polarLow, rain, rainFlood, snow, stormSurge, wind

You can find matching icons (SVG and PNG) for all events on the Yr warning icons repo.


Filter by incident (names given to red alert extreme weather phenomena)


Filter by land or marine

county (fylke)

Filter by Norwegian county number where available (only land areas, not gale warnings etc). The county number is defined as always having 2 digits, so the counties Østfold to Aust-Agder must be zero prefixed. Currently one single county allowed per request.

Note that the list of counties has changed several times during the 2018-2024 period. For an updated list, please see this dataset from SSB.

lat, lon

Coordinates for geographical search (returns all alerts covered by the search location)


Only used with the /archive method. Use ISO format for months, on the form YYYY-MM. Periods outside the archive timespan will return error. Legal values are: 2019-01, 2019-02, 2019-03, 2019-04, 2019-05, 2019-06, 2019-07, 2019-08, 2019-09, 2019-10, 2019-11, 2019-12, 2020-01, 2020-02, 2020-03, 2020-04, 2020-05, 2020-06, 2020-07, 2020-08, 2020-09, 2020-10, 2020-11, 2020-12, 2021-01, 2021-02, 2021-03, 2021-04, 2021-05, 2021-06, 2021-07, 2021-08, 2021-09, 2021-10, 2021-11, 2021-12, 2022-01, 2022-02, 2022-03, 2022-04, 2022-05, 2022-06, 2022-07, 2022-08, 2022-09, 2022-10, 2022-11, 2022-12, 2023-01, 2023-02, 2023-03, 2023-04, 2023-05, 2023-06, 2023-07, 2023-08, 2023-09, 2023-10, 2023-11, 2023-12.


Sort RSS items on field (in ascending order). The following fields are available:

  • area
  • event
  • incidentName
  • t_onset
  • t_published
  • type

Example requests (show alerts for Agder county) (check RSS feed above for working URLs)



MetAlerts 2.0 is now in production. Version 1.1 is deprecated and will be removed on 2 Sept 2024


Several new properties added to GeoJSON output:

  • status (Actual eller Test)
  • municipality (kommunenr)
  • web
  • contact
  • description (for resources, previously broken)
  • altitude (feet above msl)
  • ceiling (feet above msl)


Added GeoRSS polygons to RSS feed. Position search has been optimized and is now production ready.


New version 2.0 beta, using new CAP v2 profile for testing


Added lightning event type.


Experimental alert archive implemented. Use the period parameter to enable. The RSS feed link has been removed from available, now only lists CAP files.


The eventCode drivingConditions has now been replaced by the eventCodes ice and blowingSnow to better reflect actual causes instead of consequences


Support for filter on incidentName


Support for search by county number (for warnings issued after 2018-03-15)


Experimental support for search by coordinates

1.1, 2017-05-20

New version of CAP format (1.0). MetAlerts 1.0 will expire 2017-12-01

1.0, 2016-09-01

More search parameters, improved stability. The cap parameter now requires an ID, not a date.

0.2, 2016-04-20

Format officially changed to RSS 2.0

RSS now validates, using RFC-822 date format and no duplicate items

0.1, 2016-03-02

Renamed to MetAlerts. Format claimed to be Atom, but is in fact RSS 2.0 (invalid)

0.1, 2016-01-19

New product for testing



Other versions

Supplemental documentation

Output format descriptions

Alerting colour criteria

Other documents (in Norwegian)

Technical details