Contradiction with Matthew 8:24
In Matthew 8:24, the description of the storm uses language similar to Luke 8:23, making it not a direct contradiction but a parallel.
Matthew 8:24: And, behold, there arose a great tempest in the sea, insomuch that the ship was covered with the waves: but he was asleep.
Contradiction with Mark 4:37
Mark 4:37 describes a similar event with specific details about the storm, which could contradict the portrayal of severity or timing, but is not a direct contradiction to Luke 8:23.
Mark 4:37: And there arose a great storm of wind, and the waves beat into the ship, so that it was now full.