Siren Activation length during Tornado Warnings

[Archon]

Most Siren motors are 15-minute duty. If there are on longer with out a break one of three things happen The thermal overload if equiped shuts them off. untill they cool down. 2 they start to draw more amps and the Motor controller heaters dump the contactor out. must be reset by had.
3. the motor windings burn out. siren smokes

[kswx29]

Here in Shawnee County they sound the srens for 3 mins twice, Example:
7:50 Sirens Sound
7:55 Tornado Warning Issued Sirens Sound Again

and of course if the warning is extended or is re-issued they will then sound again.

[Travis]

From my experience in Lewisville, the sirens are set off in whoop for 1.5 minutes in a tornado, and then they are done.

[500AT]

The official policy in my county, is that if a large tornado is confirmed on the ground, the sirens will be cycled every 10 minutes. The signal used is a three-minute steady, continuous blast. Conversely, many local communities in the past, used a 3-5 minute wavering (Attack Warning) signal for tornadoes. Thankfully, this policy stopped in the early 1980s, as some towns used the same signal for summoning volunteer firefighters to the station on a call-out.

In addition, if a Severe Thunderstorm is producing confirmed wind gusts over 115 km/h, the sirens will also sound for a three-minute steady, continuous blast. This is a great idea for those that are outside boating or playing golf.

Ron