Emergency Alert System Nationwide Test (EAS) - TimeWarner TV

I haven't seen anything official posted by TWC/Spectrum on this so I am passing it along:

Emergency Alert System Nationwide Test (EAS)

On Wednesday, September 28, 2016 at 2:20 p.m. (Eastern Standard Time), The Federal Emergency Management Agency (FEMA), in coordination with the Federal Communications Commission (FCC), will conduct a mandatory nationwide test of the Emergency Alert System (EAS)
The nationwide test is required for all broadcast, cable and satellite companies and is intended to allow the FCC and FEMA to determine how well the nationwide EAS works and what, if any, improvements may be necessary. The test will last approximately one minute.
During the test all programming will be interrupted, you will not be able to change the channel and the EAS test message will display on the screen.
At the end of the EAS test all services will return to normal.