Tornado sirens were heard across Milwaukee County Thursday as the National Weather Service issued a tornado warning for parts of the county. The warning expired at 5:45 p.m. and areas affected ...

The state uses a single alert siren to signify an emergency alert, such as a severe storm or tornado warning. An audio sample of this siren is available on the Illinois Emergency Management Agency ...

Tornado alert terminology explained by the National Weather Service. Sirens are tested on the first Tuesday of each month at 10 a.m. in Illinois. The state uses a single alert siren to signify an ...