A red flag is one of the most important warnings to recognize. In many beach warning systems, it indicates a high level of danger caused by rough surf, strong currents, or other hazardous conditions. Swimmers are generally advised to stay out of the water.
The danger may not always look dramatic. Sometimes, the shoreline appears relatively calm while powerful currents move beneath the surface. At other times, waves break forcefully near the beach, creating conditions that can knock swimmers over or make it difficult to stand.
Red flags are especially concerning for people who are not strong swimmers. Even someone who knows how to swim well in a pool may struggle against waves and currents that constantly change direction and intensity.
When a red flag is flying, the safest decision is to remain out of the water unless local authorities provide specific instructions otherwise.
Avoid the temptation to enter the ocean just for a quick dip or photograph. Strong currents can carry someone away from shore in a short time, while exhaustion can develop rapidly when a swimmer tries to fight the water.
If you are visiting with children, explain that a red flag is not a suggestion or a challenge. It is a serious warning intended to prevent accidents.
Remember: Red flags can mean different things in different local systems. At some beaches, a single red flag means high hazard; at others, it means swimming is prohibited. Always check the local sign.
4. Double Red Flags: The Water Is Closed
Two red flags displayed together commonly indicate that the water is closed to the public. In systems following the United States Lifesaving Association's warning definitions, entering the water under a double-red-flag warning is prohibited.
This is not simply a warning to be extra careful. It means the authorities have determined that conditions are dangerous enough to close the water to swimmers.Possible reasons include:
-
Extremely strong currents or dangerous surf.
-
Severe weather or rapidly deteriorating conditions.
-
Hazardous marine life or another immediate threat.
-
Water-quality concerns or other local emergencies.
The exact reason may be explained on a nearby sign or by a lifeguard.
If you see double red flags, do not enter the water, even if other people appear to be doing so. Do not assume that staying close to the shore makes it safe. Waves can knock people down in shallow water, and strong currents may affect areas that look harmless.
If you are already swimming when the warning changes, leave the water promptly and calmly, following lifeguard instructions. Do not stop to collect beach toys or belongings if doing so would delay your exit.
Ignoring a closure can put not only you but also rescuers at risk. In some locations, entering closed water can also result in fines or other penalties.
5. Purple Flag: Potentially Hazardous Marine Life
A purple flag commonly warns that potentially hazardous marine life has been reported or may be present in the water. Depending on the local system, this can include jellyfish, stingrays, sea urchins, or other animals that may injure swimmers.
The presence of a purple flag does not necessarily mean that every marine animal is dangerous. It indicates that beachgoers should be alert to a particular type of risk.
Why marine life warnings matter
Jellyfish are a common concern at some beaches. Certain species can cause painful stings, while a small number can cause serious medical reactions. Their presence may be difficult to detect, especially when they are transparent or partially submerged.
Stingrays may rest on sandy seabeds in shallow water. If accidentally stepped on, they can defend themselves with a sharp spine that may cause a painful injury.
Other marine animals can cause harm through stings, spines, bites, or contact with irritating substances.
What should you do if a purple flag is flying?
First, read any accompanying signs and ask a lifeguard what has been reported. The appropriate response depends on the species, the severity of the warning, and local guidance.
If swimming is permitted, avoid touching unfamiliar marine animals, even if they appear to be dead or stranded. Keep children from picking up shells or creatures they find in the water, and wear suitable footwear where local authorities recommend it.
If someone is stung or injured, seek advice from a lifeguard or medical professional. Severe pain, difficulty breathing, faintness, or other serious symptoms require urgent medical assistance.
One important distinction: a purple flag is generally used for hazardous marine life other than sharks. Shark sightings or other serious emergencies may prompt a different flag or a complete closure, depending on the local system.