Yes, whilst this (our) Portugal/Med cruise isn't too badly affected, our other cruise to Norway is.
For that cruise, we now arrive in Flam 1 hour earlier at 7am, BUT we leave 3 hours earlier at 3pm. This has caused huge inconvenience for many who have booked excursions there - especially on the train. So we lose 2 hours.
For Tromso, we arrive 4 hours later at 1pm and leave at the same time - so we lose 4 hours.
For Honningsvag we arrive 1 hour earlier but leave 2 hours earlier.
We have been on a many Celebrity cruises and have had our fair share of cancellation of ports due to weather, which are not the fault of Celebrity. The most memorable being anchored outside St Petersburg for 2 days (high winds) and missing Bar Harbor (a weather bomb).
Like BigAl94 - post #60, I don't recall anyone saying the ship is not seaworthy. The post by chengkp75 - post #56 is very informative as to the rules and regulations.
As we had to transfer two cruises last year to this year for medical reasons with my wife, we are very loathed to cancel these two, and we will just have to 'lump it'. But our UK Celebrity cruise rep will be told our dissatisfaction!