So if this thing is going to scan for debris being picked up, what will stop it from catching debris from severe thunderstorms or possibly even hail? Haven't we already seen problems from current radar being a bit too sensitive and causing tons of unjustified warnings? I'm not saying it's a bad thing (other than folks will become even dumber and take even more unjustified risks with their lives by ignoring warnings more often probably), but I do wonder if this is actually a step worth taking or not.
Honestly, whether or not a tornado is on the ground is irrelevant. You should always ere on the side of caution. Don't have people waiting to see whether or not the radar indicates it to be on the ground. As has already been described in some of my previous postings, it's never a good idea to give people more rope to hang themselves with. If it looks like a good old fashioned hook echo, it's time for folks to hit the basement. It should be that simple IMO.