Another option: dump the landline. For most this would take the bulk majority of calls away. (Some do get through to my cell phone...)

I consider this the electronic form of a homemade sign. Occasionally I put up messages like "slow down"

I'd like the link too

There are plenty of multifunction watches (built in stopwatch, alarm, light, etc.) that have been around for 20-30 years, were relatively cheap (even in 1987-1991ish), and are waterproof. If the 2014 "smart watch" ain't waterproof, it ain't smart enough for me.

People themselves should be responsible for choices they make. In this scenario a smartphone app could act as a supplement but not a replacement for an avalanche tracker.