(KNZA)--The Federal Emergency Management Agency, in coordination with the Federal Communications Commission, will conduct a national test of the emergency and wireless alert systems on Wednesday, October 4.

FEMA said the test message will be sent to all cellphones, TVs and radios at 1:20 Wednesday afternoon.

The test message sent to cellphones will state: "THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed."

A separate message will be sent to radios and TVs.

FEMA says the test is to ensure that the systems continue to be an effective means of warning the public about emergencies.

The systems are primarily used to send notifications about severe weather or other safety threats and Amber Alerts.

Federal law requires the systems be tested at least once every three years. The last nationwide test was Aug. 11, 2021.