NBC Weather Plus is overrated. If you want to know what the weather is like in New York it is great. Plus, they show too many dang commercials and PSA's. Personally, I care more about local conditions and radar then what the weather is in other parts of the country. I can get that on The Weather Channel.
Which reminds me - NBC is selling Weather Plus to The Weather Channel, so most likely, all Weather Plus sub-channels will become some variant of TWC - Storm Stories 50 minutes per hour, with 10 minutes of local conditions and forecasts.