Warning system

Its purpose is to enable the deployer of the warning system to prepare for the danger and act accordingly to mitigate or avoid it.[how?

][citation needed] Warnings cannot be effective unless people react to them.

[2] Some warnings are non-specific: for instance, the probability of an earthquake of a certain magnitude in a certain area over the next decade.

Such warnings cannot be used to guide short-term precautions such as evacuation.

Opportunities to take long-term precautions, such as better building codes and disaster preparedness, may be ignored.

A HSS Engineering TWS 295 electronic sirens warning Civil Defense siren.
There are 8,200 alarm sirens for civil protection throughout Switzerland . They are tested once a year, on the first Wednesday in February. [ 1 ] Sound sample ⓘ
Warning light indicating danger of laser exposure
Early warning siren for earthquakes and floods
A fire alarm that warns people if a building is on fire