Update**  Due to response efforts for Tropical Storm Florence, the test message originally scheduled for Thursday, has been pushed back to Wednesday, October 3.

On Thursday September 30, the Federal Emergency Management Agency, in coordination with the Federal Communications Commission, will conduct it's first test of an alert system that allows President Donald Trump to send a message directly to most U.S. mobile phones.

FEMA announced last week that over 100 mobile carriers would be participating in the inaugural test, including all major wireless carriers.

The Wireless Emergency Alerts (W.E.A.) will commence 2:18 p.m. nationwide followed by a test of the Emergency Alert System (E.A.S.) at 2:20 p.m. Cell towers will broadcast the WEA test for approximately 30 minutes. During this time, WEA compatible cell phones that are switched on, within range of an active cell tower, and whose wireless provider participates in WEA should be capable of receiving the test message. Some cell phones will not receive the test message, and cell phones should only receive the message once. Users receiving the alert will hear a tone twice and vibration and then see this English-only (for now) message with header that reads "Presidential Alert" and text that says:

“THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.”