Overview
- Heavy mats of sargassum washed up along wide stretches of Florida this week, with major buildups reported June 11–13 that left beaches coated and some visitors avoiding the water.
- NOAA daily tracking flagged a high-risk corridor from Miami-Dade through the Keys and medium risk for parts of Broward, matching local reports of large, fast-returning seaweed piles.
- Medical experts warn that decomposing sargassum emits hydrogen sulfide, which can irritate the eyes and airways, and that the piles can host harmful bacteria that raise infection risks for people with open wounds.
- Local crews are racing to remove the seaweed but face narrow work windows because of sea turtle nest surveys and daytime crowds, making cleanup costly, temporary and quickly undone.
- Researchers link the outbreak to a decade-long shift in ocean conditions and nutrient loads that created the Great Atlantic Sargassum Belt, a background that suggests repeat invasions and continued pressure on tourism-dependent communities.