Keep in mind the captain is not up on the bridge making decisions in isolation. They are up there with a navigation team and are often in contact with their home offices - Miami in this case - home of the NOAA hurricane center.
Also, tropical storms can move much quicker than a ship, and as much has forecasters would like to tell you where they (the storms) are going to go, the storms go where they will. This is why many Floridians don't get twitchy until the last minute. They have seen many storms that were supposed to hit but went the other way at the last minute.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013