If it's still CAT 5 when it makes landfall, you're going to have a very bad day. Regardless of how well preparred you are.
The two main dangers are the storm surge. The wind pushing massive amounts of ocean water ahead of it, flooding coastal areas. With powerful storms this can be huge. Somewhat akin to tsunami.
And wind speed. Wind speed can allow you to become complacent. Most hurricanes make landfall with windspeeds below 100 miles an hour. Building codes in Florida are designed for this. So long as the storm surge hasn't undermined your foundation. Above 100 things get unpleasant. Very unpleasant. Get close to 200 and whether the building codes will work is a crap shoot. Your roof will probably go bye bye. Along with your walls, pets, small children.
If you want to be horrified look at some day after photos from huricane Andrew.
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