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Warning SirensWarning sirens will be activated if a tornado has been sighted near Johnston. A steady 3 minute tone will indicate a tornado warning and that you should immediately seek shelter in your basement or somewhere else below ground level. The Weather Bureau uses the term tornado watch to mean conditions are such that a tornado is possible. The sirens will not be sounded for a watch but will be for a tornado warning (a funnel cloud has been sighted in the area either by radar of an observer). The sirens will also normally be tested in conjunction with all civil defense sirens in Polk County the first Sunday of each month at noon. The city has purchased 3 additional sirens to increase area coverage. The warning sirens are now located at :
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