This site, http://appcomm.org/, offers a generous selection of public safety apps for citizens and public safety officials – five pages of offerings. Nice service to put them all in one place.

The Diva has several of these on her phone, including first aid apps as well as one from my county, state, and FEMA.  The National Weather Service seems to know where to find me, even without my signing up, since twice they have pushed out notices re a tornado watch in my immediate area.