I was at the beach yesterday and despite the warning sign I saw some people thinking about jumping into the water. I told them it wouldn’t be a good idea to jump from a 6 meter high cliff into 2 meters of water. I’ve jumped from this cliff and had done so about a week earlier however that was at high tide and just after the the moon was lined up with the sun as it is during a new moon or a full moon.
To learn about high tide, low tide, spring tides, neap tides, and how to better predict them check out this website by the National Ocean and Atmospheric Administration.
Predicting the Tides: Webpage
Lesson on Tides: Slideshow or Video
It helps to know where exactly the moon is at.
P.S. I bet Professor Splash and Dana Kunze could have done it safely.