How to understand the underware percentage?

[Jerry Wang]

Hello,

I am looking at properties with cash flow and potential appreciation in FL. 

Looking at Tempa, FL in zillow, 

A number gets my attention. "The percent of Tampa homeowners underwater on their mortgage is 11.4%, which is higher than Tampa Metro at 9.0%." This number seems also high for other cities in FL. 

Given that it has been ~ 8-10 years after the last crash, does this imply  that this city has no good appreciation potential?

Thanks.

Jerry