The Administrative Message (ADR) is used by the NWS for a variety of routine purposes. In the context of the HazCollect system, the Administrative Message/Follow Up Statement is used to update an unexpired, previously issued warning.
Since updates should refer precisely to the previously issued alert, it is likely that your authoring software will provide a specific function to perform this tasks. You may not have an option to select the Administrative Message product per se; however, when ultimately disseminated through the NWS system, this is the product that will be used.
Your authoring software will also provide a method to correct a previously issued alert. The correction will be issued using the same NWEM message type as the originally issued alert.
General Guidance
Corrections or updates to previously issued warnings are intended for Emergency Alert System broadcast, therefore they should be used only when warranted by significant changes from the previously issued message.
- If an NWEM is issued unintentionally, the inadvertent message should be canceled/retracted immediately using either a correction or update, for the same geographic area. The follow-up product should state that the original message was issued in error, and that no hazardous event is expected.
Updates
- Update when the situation has materially changed, and the original alert has not expired (maximum duration of an NWEM is 6 hours).
An appropriate use of an update would be to cancel an existing NWEM because the threat or situation no longer exists. Examples may include providing an "All Clear" message for a previously issued Shelter in Place Warning, or cancelling an Evacuation Immediate warning.
- Another example of an appropriate use of an update may be to provide new protective instructions, required by an evolving situation.
Corrections
- Correct when previously included information was erroneous, and when the error is non-trivial.
- An example of an appropriate correction may be if a previously provided, alternate emergency telephone number were erroneous.
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