Oakland County Homeland Security will be testing the outdoor warning siren
system in 2015 on:
...The first Saturday of each month at 1:00 PM,
with the following exceptions:
- April 4 (Saturday); cancelled due to Severe Weather Awareness Week testing.
- April 15 (Wednesday) at 1:00 PM (Special test in recognition of Severe Weather Awareness Week).
2015 Siren Test Calendar.pdf
Siren tests are NOT conducted during December, January and February due to winter weather.