I have no idea about the 26th, but I’m wary of the following two dates:
FEMA IPAWS will hold a National test of the Emergency Alert System (EAS) on Wednesday, September 28th, 2016 at 2:20pm EDT.
http://www.fema.gov/emergency-alert-system
Upcoming IPAWS National Test
Last Updated: 09/19/2016 - 08:19
The Emergency Alert System (EAS), is a resilient form of emergency alert notification, and the National EASRoad sign reads State of Emergency in Effect, Television EAS reads Tornado Warning - Emergency Alert System EAS Participant Issued a Tornado Warning, Siren, and Radio Test that was designed to assess the President’s ability to send a message to the American people within 10 minutes of a disaster.
In the event of an unforeseen circumstance, such as a major weather event, the back-up date for the IPAWS National Test is Wednesday, October 5th at 2:20pm EDT.
Much more obviously... that’s the date of the debate.