IIRC the MetNet announcement a few weeks ago said that their model is now used when you literally Google your local weather. I don't think it's available yet to any API that third party weather apps pull from, so you'll have to keep searching "weather in Seattle" to see it.
It's also used, at least for the high resolution precipitation forecast, in the default Android weather app (which is really part of the "Google" app situation).
Most likely explanation would be that Weather.com signed a contract with Google X years ago to have something placed there, and nobody wants to do the work to do anything about it.
