If you see a flag at the beach and do not know what it means, ask a lifeguard for an explanation or look for an indicator key near the beach entrance or in a public area. Coronado beachgoers may have noticed purple flags at the beach recently, set out to alert the presence of stingrays in the water. Coronado Lifeguards treated a number of people who were stung by stingrays this past week. Higher water temperatures attract stingrays, who like to hang out in shallow waters near the shore and tend to sting more people during low tide. Lifeguards recommend shuffling your feet in the water as a first line of defense to avoid stepping on a stingray. If you are stung, it is best to seek assistance from a Lifeguard immediately. The wound may not initially be painful, but the poison in the barb is very painful and pain will set in within a short period of time.
The information below is from the City of Coronado website
The United States Lifesaving Association, in conjunction with the International Lifesaving Federation, has developed a flag warning system that has been adopted by coastal communities worldwide to notify beachgoers of potential water hazards. Understanding and heeding these colored flags keeps you safe in the water and helps you enjoy your trip to the beach.
The most serious of all beach warning flags, red flags warn swimmers of serious hazards in the water. One red flag means that the surf is high or there are dangerous currents, or both. Though you can still swim if there is a red flag, you should use extreme caution and go in the water only if you’re a strong swimmer. Two red flags, however, means that the water is closed to swimming, as conditions are too dangerous for even the strongest swimmers. In some communities, red flags feature the symbol of a swimmer with a white line through it, indicating that swimming is prohibited.
When ocean conditions are rough, but not life-threatening, you might see a yellow flag on the beach. A yellow flag indicates potentially high surf or dangerous currents and undertows, and means that swimmers should exercise extreme caution. If there is a yellow flag, swim only near lifeguards and heed all lifeguard warnings. If you’re swimming with children, or you aren’t a strong swimmer yourself, wear a life jacket when swimming on yellow-flag days. Some beaches have a permanent yellow flag because of rocks, a sudden drop-off or a high population of bait fish that attracts predators.
The ocean is always unpredictable, and even on clear and calm days, hazards still exist. Still, there are days when the threat of danger is lower than others. A green flag on the beach is an all-clear sign, indicating that it’s safe to swim. Even when the flag is green, though, exercise caution in the ocean, listen to lifeguard warnings and keep a close eye on children.
Stingrays, jellyfish and other dangerous marine life can turn a fun day at the beach into an unpleasant day at the hospital — or worse. When potentially dangerous ocean animals have been spotted, you’ll see a purple flag. These flags fly either on their own or with other colored flags. If you see a purple flag, but the water is not closed to swimming, use extreme caution and keep a close watch for dangerous animals.
YELLOW FLAG WITH BLACK BALL
A yellow flag with a black ball will normally be posted between swimming and surfing zones. This flag also indicates that only soft surf boards can be used (i.e., no fiberglass surfboards). Check signs or ask a lifeguard for the proper zone for your activity.
Some beaches use flags that are particular to that beach or related to common activities there. If you see a flag at the beach and do not know what it means, ask a lifeguard for an explanation or look for an indicator key near the beach entrance or in a public area.