WOW!
Should be a heck of a trip. I know a few people who have done it. Can't speak for Cancun, but when it comes to Mobile, you can typically expect fair winds in the morning, dying off around lunch time, and then returning in the early to mid afternoon. I haven't sailed very far from shore, so not much experience out there. Typical days include a couple of thunderstorms running around in the area. They are not generally widespread, but usually small, intense and fast moving and usually in a west to east or southwest to northeast pattern. Keep in mind this is one of the wettest parts of the country most years. It's not a hazzard, but something to keep in mind. That's all I can think of for now. Any other questions about Mobile? It's a great town.