Dam failure. Flood evacuation.

Nashville, Illinois

"Secondary Dam Failure, area has been overtopped with flood waters, please evacuate if you are in the below shaded area!

"Attention The Failure of the Nashville dam is imminent. Please evacuate your home at this time. If you are in the grey box, you need evacuate now!"

https://www.yahoo.com/news/residents-ordered-evacuate-now-amid-153219056.html