First thing : Raise all your valuable things on a safe height.
If water gets in (
dunno if thats possible there), it's going to be horrible.
From my experience, (
at least for tropical storms) heavy rain and thunderstorm can hit a tree near you and water can get in up to your knee (
both are from experience, it was horrid )
Your stuff can get horribly wet, especially books (further experience ) and the water can get murky and something could jump out of the water, like leeches and crabs (
I live near the coastline)
Dunno about tornadoes, hope you'll be okay.
Oh and lol, Steve!?
EDIT:I also wanna see hail.