it depends on location. Friendships, Sasagula, and MK watercraft all have a different set of rules. They were also recently updated, but I THINK the rules are this:
Friendships - run during a storm, but if the wind is too intense they will shut down. not affected by lightning
Sasagula - same as Friendships thought I'm not sure on the lightning issue
MK(I know these for sure) -
Ferryboats(TTC to MK) - most affected by wind, so if the wind is really bad, they are usually the first to shut down. Visibility is also an issue as the Ferries will not run if their destination can not be seen while docked(TTC to MK or vice versa). This is primarily because docking is a long procedure and requires the proper setup.
Launches(gold, blue, and one on the red) - Shut down when lightning is within 5 miles of MK. To "bring us in line with attractions" this was changed last year in our new operating guide. Feel free to complain to guest relations because it's stupid. We are not an outdoor attraction, we have lightning protection on the boats, and we haven't had a problem for 40 years. I'm waiting for launches to be shut down and monorails go down...then we'll see how long this lasts, but anyway...
cruisers(green route and one red) - Only shut down due to wind, however, the bow is closed during lightning so it reduces the capacity of the cruisers down to about 90 from 120. Having said that, the windier the better, I like a challenge LOL. If I can't dock the boat, then I feel there is a legit reason for shutting down =P
In the event that MK watercraft is shut down, busses are brought online for FW. The rest of the resorts we service already have alternate forms of transportation available(WL and the monorail resorts)