Why would you single out just NB here... if we are doing activities it will be in Issaquah. And the ECMWF shows mostly sunny skies on Friday and Saturday. Here is the 4th:

It's going to reverse eventually. This cold arctic since 2012 goes with record -PDO in the N. Pacific

South Dakota

No real warm signal in the believable range of the 12z runs. A chance that North Bend stays mostly cloudy on the 4th. But Goldilocks weather, as Gloom Buster might chip in.