This in interesting, confirming, only the weather radio is acting up and no other systems, ok that blows one theory I had away, I wonder if the radio propagation might be the problem, given the distance from the transmitter which is really too far away (the systems are designed for about 50 miles, according to NOAA) and the band conditions which, are at least here, are different than usual, it might be a temporary thing check this evening after dark and see if it is still the same, also check in the morning, and see what it is like.
I will do some checking on propagation conditions for your area and see what I find.