FIRE
Siren is "on" for 16 seconds, "off" for 8 seconds, resulting in a shrill high-low pitch for 1.5 minutes total
TORNADO
Siren is "on" for a full 3 minutes with no interruption, resulting in a steady high-pitched shrill sound.
When a tornado warning is made, the community center will be opened for shelter
DANGER
Siren is "on" for 6 seconds, "off" for 3 seconds. This quick on-off sequence results in a shrill high-low sound that runs for 3 minutes total.
Residents should stay inside. The danger could be a chemical spill, gunman loose in the neighborhood, etc. Tune in to radio or TV for information.