In my current area, the only real dangers we tend to face are storms, and the most dangerous are blizzards during the winter.
Every year we have reports of elderly people who die when their power goes out and their house gets cold. With something like Ushahidi, if it was tweaked to fit the people of this part of America (people over 50 tend not to know how to work a cell phone, if they even own one)- perhaps by allowing a phone number which can immediately transcribe words to text (like Google Voice's answering machine service), those people would be able to let someone out there know that an at-risk person is now without heat or electricity and either someone can be dispatched, or perhaps people in the neighborhood could designate themselves as helpers and they could be contacted and informed and perhaps they would have a shovel or a snow blower and be able to reach that person, even in a storm, and make sure they are okay, or even let them into their own home until the power and the heating is fixed.
I think it does a great job of transcription, and on any words that they know they might have messed up on shows up in gray so you know that's a "maybe" word. Nothing huge, one today said Pam instead of Sam and Alden instead of Walden, but that was easy to know the difference and they were the only mistakes. :)