The Warriors trailed 31-27 at halftime, but controlled the second half to get the win.
Cassie Kingma had 19 points, six rebounds and five assists for the Warriors. Aubrey Goorman chipped in 18 points, six rebounds and five blocks.
Mya Duncan scored a game-high 21 points for North Muskegon. Olivia Duncan had 15 points.
The Norse ended their season at 4-16.
WMC (12-10) will move on to play Kent City in the district championship game Friday night at 7 p.m.