Red Tide is a naturally occurring phenomenon caused by an overgrowth of algae in the water. In Florida, the red tide in 2023 has been caused by the toxic algae Karenia brevis.
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There are reports that the typically clear blue waters of Marathon, Florida have been inundated by the seaweed. Additionally, beaches on Florida's east coast, including Palm Beach, Fort Lauderdale, and the Miami Beach area, are also seeing mounds of sargassum wash ashore.
Since 2011, 2023 still ranks in the top half of the worst sargassum seaweed seasons. With the latest data, USF researchers say in June, sargassum will likely decrease in the Gulf of Mexico, meaning beachgoers may not have such a smelly experience. The USF lab forecasts the decrease to continue through August.
2023 is shaping up to be a banner year for sargassum, a type of brown macroalgae now starting to wash up on beaches across the Caribbean. The thick dead tangled heaps of seaweed stink like rotten eggs and could cost many millions in holiday revenues this summer.
USF reports it remains difficult to predict exact timing and location for individual beaching events but substantial amounts of the seaweed are expected in May in both the Caribbean Sea and Gulf of Mexico. June is forecast to be the likely peak of the 2023 season, but impacts are expected to continue into July.
In Mexico, sargassum seaweed season is generally between May and October each year. If you travel to the Caribbean coast of Mexico outside of that time period you can generally avoid large mats of seaweed on the beaches. Cancun to Tulum seaweed map in March 2022.
Playa Norte, Isla Mujeres, MexicoPlaya Norte is a dazzling beach in the Caribbean without sargassum seaweed. This beach is a perfect white sand haven for vacationers to take a break from their busy lives.
Miami Beach has been the poster city for sea-level rise for some time, and for good reason. By 2100, 98% of buildings in the city could be below sea level. A mild hurricane would likely flood the whole city.
Bits of Sargassum seaweed are washing ashore around Avenida 16-18 on Tuesday, May 23, 2023. Giant blobs of Sargassum hug the shoreline next to the William O Lockhart Municipal Pier in Lake Worth Beach, Florida on June 1, 2023. Sargassum accumulates on the beach at Phipps Ocean Park Tuesday May 30, 2023 in Palm Beach.
However due to ocean currents, the amount of seaweed landing on beaches in the Caribbean and the Gulf of Mexico in June and July 2023 was lower than expected. There's more good news! The sargassum seaweed forecast for September 2023 is minimal seaweed in the Caribbean Sea.
7 September 2023 Update: The Turks and Caicos is experiencing medium levels of sargassum at this time. Grace Bay, Leeward Beach, Sapodilla Bay, Taylor Bay, and the Bight Beach remain largely free of sargassum. Sargassum that washed onshore in late August has largely dissipated.
While exposed eastern shores are most likely to get hit by surges of sargassum, some beaches in Mexico have no sargassum. This includes Playa Norte on Isla Mujeres, Quintana Roo and Cozumel's western shore. They're generally seaweed-free. However, much depends on winds and ocean currents.
At this time, red tide is not present on St. Pete/Clearwater's beaches. Although many national news outlets reported about a massive seaweed or sargassum blob coming to Florida this summer, this is not affecting the beaches of St.Pete/Clearwater in any way.
The sargassum seaweed that is washing up in mass amounts on South Florida beaches is carried from off the coast of Brazil by oceanic currents, finally arriving via the Gulf Stream to be blown ashore by the prevailing onshore winds.