This is a good idea I think...
The DES MOINES REGISTER reports that now Polk county Iowa officials are sounding the civil defense/tornado-warning sirens if winds of 70 m.p.h. or greater are expected.
The change was apparently unannounced- as the DMR story says the last time officials sounded the sirens using the new warning criteria- the public used 9-1-1 to find out WHY the sirens were sounding in lieu of a tornado warning issued.
I like it because a 70 m.p.h. can kill you as those winds are associated with EF-0 and/or EF-1 tornadoes.