At the risk of contradicting Mr. Giella, who is a respected retired meteorologist, the inland Florida west coast had seabreeze collision-induced thundershowers that began on May 28, with lines of thunderstorms on that day, June 1 and 2. The following week dry air intruded on the state, with the next week being dominated by TS Alberto. The seabreeze collision resumed on or about June 16 as stated, but has since been affected, reduced or eliminated by other factors (high pressure ridges, dry air, and the like). Thus, I submit that the 2006 Florida rainy season began precisely on time.

Sorry I don't have captured radar pictures to attach to prove this assertation.