Message Retrieval Methods
The National Tsunami Warning Center (NTWC) provides tsunami warning, advisory, watch, and information messages to Canada, Puerto Rico, the Virgin Islands, and all U.S. coastal states, with the exception of Hawaii.

Methods to obtain these messages are provided below.

To obtain tsunami alerts, for other areas, please refer to the Pacific Tsunami Warning Center (PTWC) web site, at


NTWC has a feed available at that can be monitored for product updates.

Text Messages (Short Messaging System (SMS))

The NTWC Twitter feed and/or the PTWC Twitter feed can be used to receive text messages. In the U.S. you can send a text message to 40404 with 'follow NWS_NTWC' for NTWC messages, and 'follow NWS_PTWC' for PTWC messages. To stop receiving NTWC text messages, you can text 'stop NWS_NTWC' to 40404.
For more details on Twitter and SMS, please click the Twitter SMS help page

NOTE: Not all countries/carriers use 40404 - please refer to the Twitter short or long code page.


The UNESCO/IOC service will provide NTWC bulletins for seismic events greater than magnitude 6.5 . Other tsunami warning centers provide information to this list also
Common Alerting Protocol

NTWC generates Common Alerting Protocol (CAP) documents for events. The CAP document is available at:

The CAP tsunami profile (CAP-TSU), is documented at:

National Weather Service Systems

Other Federal Systems