Fig. 1. The tides at Boynton Beach and El Jobean, 1–15 July, 1998. Shading indicates the dark period. Two
tidal cycles occur each lunar day at Boynton Beach. At El jobean the tides alternate between two tidal cycles
Ž1–5 and 13–15 July; equatorial tides. and one tidal cycle each lunar day Ž6–12 July; tropical tides.. Ebbing
currents at both locations achieve maximum velocity when differences between high tide and the following
low tide are most extreme Ž12–13 July at Boynton Beach; 8–11 July at El Jobean..