"Law enforcement warning"?

This morning I saw that the US-National Weather Service had issued another interesting warning. This one is termed "Law enforcement warning." Are there bands of rogue sheriffs roaming around southeast SD? A plea for residents to stay indoors to avoid the dangerous cops?

Hahaha. In reality, it has the same effect as "civil emergency message," although "law enforcement warning" sounds a lot cooler. The area under the advisory had been hit by strong thunderstorms a few hours earlier, and the text advised citizens to use caution (or stay indoors) because of all of the tree damage.