Is the sargassum patch headed to Florida?

A giant wall of seaweed is coming to the shores of Florida, Mexico and the Caribbean over the summer. The matted brown seaweed stretches for miles across the ocean and provides breeding ground, food and habitat for fish, sea turtles and marine birds, according to the National Oceanic and Atmospheric Administration.



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Sargassum seaweed washing up on Florida beaches has ebbed to levels normally seen in early fall, even below normal in some areas. The once-anticipated 5,000-mile-wide bog in the Atlantic and Caribbean has rapidly — and mysteriously — disappeared.

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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.

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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.

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no matter how much Sargassum we'll land on the east coast beaches, the west coast of Florida is largely spared every year [and] this year is no exception, Dr. Hu says. Nevertheless, they still anticipate there will soon be an impact on beaches in South Florida where the brown seaweed washes ashore.

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In Florida, barrier islands like Miami Beach and West Palm Beach tend to get the worst of it because they jut out closer to the Gulf Stream. But Atlantic beaches in states to the north also could see seaweed.

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  • Grand Anse in St. ...
  • Morne Rouge Beach on Grenada. ...
  • Grace Bay Beach in Providenciales, Turks and Caicos. ...
  • Palm Beach in Aruba, Dutch Caribbean. ...
  • Playa Porto Mari on Curacao, Dutch Caribbean. ...
  • Bloody Bay and Long Bay Beaches in Negril, Jamaica. ...
  • Beaches in Antigua & Barbuda.


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Florida's seaweed season typically runs from April until October, peaking in June and July. The seaweed comes in waves, depending on currents and wind direction. The seaweed itself is not harmful to humans, but decaying sargassum on beaches releases hydrogen sulfide that can impact people with breathing issues.

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Piles of sargassum seaweed are accumulating on the beaches of Florida's Key West. Scientists say the seaweed is expected to increase even more over the next few months.

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Sargassum season in the Mexican Caribbean typically runs from May through October, with July and August generally being the worst months for its arrival.

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As a result of this, Fort Lauderdale crews are out daily, scooping up the fresh sargassum from the beaches. They take truckloads of it to a park where the city repurposes it and by the time it decomposes, it has very little smell and becomes fertile soil.

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As summer is now in full swing, however, scientists with the University of South Florida Optical Oceanography Lab found a drop in the amount of sargassum blooms. Sargassum seaweed on a Fort Lauderdale beach. May 2023. They noted that the amount of seaweed dropped by about 9 million metric tons between May and June.

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Currently, beach cams in Fort Myers Beach and Naples show clear shorelines with little to no sargassum. It is noted that 'Seaweed Season' just ended, which tends to appear on Florida beaches in the spring, with a peak in June.

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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.

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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.

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Sargassum is at its worst between April and August, peaking in July and August, although this year saw the seaweed arrive early, with some beaches being hit heavily in March. What is this?

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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.

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