What does each beach flag color mean? A guide to the warning system amid severe weather and shark attacks.

Nothing says a warm day quite like the beach, but beyond the shore lies a number of dangers, from rip currents and strong waves to shark attacks and bobbing jellyfish. Onshore, however, you will likely find a flag warning you of potential dangers, and whether it's purple, yellow, red or blue can tell you which hazard could be lurking in the waters. 

A day on the beach can be full of fun, but when swimming in the ocean, be aware of its conditions and what other forms of life could be present beneath the surface. According to the U.S. Lifesaving Association, beach flags and their designated meanings were created to help inform people of just that. Many of these flags are also used around the world.

So what exactly are beach flags and what do they mean? Here are the flags approved by the association for use on beaches where lifeguards are trained to its standards.