Really important to check for widow makers in the trees that you set up in. I only use the fly when its raining or looks like it, and use a heavyer tarp than most. This settup survived a night of forty+ mph gusts with rain, but it was not fun. All ten tiedowns were needed that night.
Once another wind storm kicked up overnight and I just rode it out, it was like an amusement park ride. My friends rainfly on his tent was torn up a bit, but we all lived.
The only thing that will get me out of the hammock and on the ground is a lightning storm. I pack a small tent as well as the hammock, cause I like flexibility.