To clarify, NOAA radio will continue to operate on your present device. TV Band radios will not work after the switch.
With NOAA the problem is they don't track tornados like the 3 major television stations do and the only things available to replace the old style portable TVs are the Radio Shack / Best Buy models with rechargeable batteries. Sure you can get by for an hour or two but not when the power is off for a longer period.