It's worth noting that the rainfall forecasts from the NWS are dictated by WPC, not the local offices. Local offices can make changes to WPC for days 1-3 providing they can get their neighboring offices to agree to changes.
Additionally, its worth noting that WPC has a chronic high precip bias for amounts over 1" or so. So when you see big rainfall forecasts a few days out, it's probably going to diminish as it gets closer.