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If you hear a screeching alert go off on your cellphone – and everyone else’s cellphone – this Wednesday, Oct. 4, at 11:20 a.m. or soon after, don’t panic.

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The federal government is conducting a nationwide test of its Emergency Alert System and Wireless Emergency Alerts, sending emergency alerts to all radios and televisions and direct alerts to all consumer cellphones.

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The purpose is to ensure that the systems continue to be effective means of warning the public about emergencies, particularly those on the national level, said the Federal Emergency Management Agency, which is conducting the test in coordination with the Federal Communications Commission.

How does this impact me?

Beginning at approximately 11:20 a.m., all wireless phones should receive an alert and an accompanying text message: “THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.”

The free text message will be sent in either English or Spanish, depending on the language setting of your device. It will be accompanied by a unique tone and vibration meant to make the alert accessible to the entire public, including people with disabilities, FEMA said.

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The test will be broadcast by cell towers for approximately 30 minutes beginning at 11:20 a.m. Pacific Time, FEMA said. All compatible wireless phones that are switched on, within range of an active cell tower and whose wireless providers participate in the test should receive the text.

Meanwhile, all radio and television stations will also broadcast a test emergency alert at the same time. This message, which will run for approximately one minute, will state, “This is a nationwide test of the Emergency Alert System, issued by the Federal Emergency Management Agency, covering the United States. … This is only a test. No action is required by the public.”

Has this happened before?

Wednesday’s test is set to be the seventh-ever nationwide test of the Emergency Alert System – the alerts that are sent through radio and television broadcasters. It is the second nationwide test of the Wireless Emergency Alerts sent to consumer cellular devices.

The most-recent test run of both systems took place in 2021. The first-ever test of the Emergency Alert System occurred more than a decade ago, in 2011.

Have officials messed up alerts before?

There have indeed been multiple high-profile mistakes, attributed to errors at the state level, associated with mobile emergency alert systems that hit cellphones.

Perhaps the most infamous incident was a 2018 misfire in Hawaii that set off a wave of short-lived panic across the state: On the morning of Jan. 13, 2018, a Hawaii state emergency management worker accidentally pushed the wrong button in the emergency operations center, sending out a false warning alerting of an incoming ballistic-missile threat. The employee who pushed the wrong button was fired, state officials said.

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And earlier this year in Florida, state emergency management officials issued an apology after Floridians were awoken at 4:45 a.m. by a test emergency alert sent to their phones. State officials said the test alert was meant to run only on TV and not meant to disturb anyone who was sleeping. Florida also said it was ending its contract with the software company blamed for shooting off the pre-dawn test alert to cellphones.

Last year, a FEMA official told CNN that vulnerabilities in software that TV and radio networks around the country use to transmit emergency alerts could potentially allow a hacker to broadcast fake messages over the alert system. The agency at the time urged operators of these devices to update their software to address the issue. The advisory did not say, however, that alerts sent over text messages could be impacted. The official also said at the time that there is no evidence that malicious hackers have actually exploited the vulnerabilities.