Here's some sense. Norwegian Jewel, Norwegian Sun are inside passage, protected from the open ocean. Most of the others are south of the low. Wonder how are Quantum passengers are enjoying the 14' seas with 34 knots on the tail? Nieuw has 40 knots on the nose.
BTW, Grand Princess is docked in Whittier.
Does this help answer "Why these ships are on the move and Radiance is not?"