Datafox;
Did you know that at the larger airports the controllers don't do the augmenting, but a contract weather observer???? We give them the tower vis, but that is it... I think that you will find that at most locations where the tower does provide the back up as long as they have the staffing to keep up with the changing weather they will keep it up to date. Of course with our staffing starting to tank at some locations, that may be problematic. Oh, also, if you are having issues with the weather reporting, please file NASA ASRS reports to document it.
regards
Scott H. Voigt
NATCA Safety and Tech Chairman
Southwest Region