The Japanese fleet set sail to Pearl Harbor on the 26 Nov. Say on
the 30 Nov it ran straight into a major storm. Some of the ships
were badly damaged; the fleet needs to return for repairs.
What happens now?
Well, their first priority is to get word back to Imperial HQ to prevent
the other attacks happening. Because if those attacks start, Japan is at
war with the USA anyway, and the Pacific Fleet is undamaged, which is a
very serious problem.
Assuming they get word back without giving away that the fleet was out,
there are frantic repairs, and the operation is tried again a few weeks
later. That time around, they may get to attack Force Z in harbour as