The message will arrive at approximately 2:20 p.m.

ET

FEMA’s testing to ensure the system works properly.

If the test needs to be postponed for any reason, a follow up will occur on October 11.

A photo of a Presidential Alert sent through the national Wireless Emergency Alert System

Theo Wargo/Getty Images

According to the agencies, the alert should arrive within 30 minutes.

Theo Wargo/Getty Images

“THIS IS A TEST of the National Wireless Emergency Alert System.

It will last approximately one minute, with radio and television broadcasters participating.

In 2018, Hawaii’s Emergency Management Agencyerroneously sent a messagewarning residents of an impending ballistic missile attack.