Most sea level rise is from the expansion of water as it warms up. About half the rise in sea levels the last 25 years is due to just the increasing water temperatures. In the worst case, with all glaciers melted, it is estimated it will be the cause about 75-80% of sea level rise due to the increased global temps, if that comes to pass. The rise in sea level makes flooding more common in FL because the limestone bedrock it sits on acts like a sponge so that the water table rises with the ocean's rise. This causes problems with sewage systems and clean water supplies. Flooding can happen on sunny days due to tidal forces there. Storm surges cause more damage. This is why nobody wants to insure in FL. That state is screwed within a decade or two, if not sooner, and that is why insurance companies are bailing.
Here is a nice, fairly short summary of Florida's issues. Surprisingly, Texas has seen sea levels rise 18 inches compared to 8 inches for FL since 1950 due to sinking land. Here are the issues from it that Texas faces. Sea level rise on the west coast is only 3 inches because the land there is actually rising due to tectonics.