Monthly bulletin, near-daily imagery
USF Optical Oceanography Laboratory
Satellite-derived Floating Algae Density and monthly Sargassum outlook bulletins for the Great Atlantic Sargassum Belt.
Open feed →Live conditions
Watch the belt before it reaches the beach.
Interception is only lawful and defensible when detection is real. These are the feeds that establish whether an accumulation is dispersed offshore habitat or a documented shoreward-bound mass.
Live map
Beaches and risk areas
Every marker is a documented watch site with its own source. Filter by stage, open a marker for the current read and jump straight to the underlying feed.
Blue-Brown interface
Zone decision simulator
The operating rules the pilot would run on. Distance alone never authorises collection — the corridor opens only when forecast confidence, wildlife clearance, a safe window and a receiving destination all hold at once.
Blue-Brown interface
Is collection lawful here?
Zone C is never triggered by distance alone. Move the conditions and watch the operating posture change.
Zone C · Response corridor
Response corridor — permitted low-speed extraction
Forecast + field verification + wildlife clearance + receiving destination.
Stranding probability 70% with 55% mat density.
Wildlife clearance, safe window and receiving destination are all confirmed.
Extraction runs at the velocity differential with observers and stop rules live.
AConservation
BResearch only
CResponse corridor
DShoreline emergency
Illustrative decision aid built from the published operating rules. It is not an agency determination and does not authorise any activity.
Stage map
Current schematic readout
The Great Atlantic Sargassum Belt stretches from West Africa to the Gulf. Every coast inside it is on the same clock.
Schematic stage map — not a navigational chart
Stage readout
- West Africaamber
- Mid-Atlantic beltgreen
- Lesser Antillesred
- Dominican Republicred
- Mexican Caribbeanblack
- Florida Keysred
- Southeast Floridaamber
- Puerto Rico / USVIred
greenDispersed offshore
amberConverging nearshore
redPersistent accumulation
blackShoreline emergency
Satellite
Floating algae density
Feeds
Monitoring sources we track
A scheduled backend job refreshes these feeds and logs each run. Nothing publishes to the site without moderator review.
Continuous
Sargassum Monitoring
Crowd- and observer-fed official map of arrivals across the Caribbean, Mexico and Atlantic coastlines.
Open feed →Daily
SargazoWatch
Regional beach-by-beach condition tracking, including a USA view.
Open feed →Daily
NOAA CoastWatch — Sargassum Inundation Risk (SIR v1.5)
Daily 1 km inundation-risk product for Caribbean and Gulf shorelines. The underlying USF AFAI grids (1-day, 3-day, 7-day) are published as an open ERDDAP API, so we query the data directly rather than scraping the viewer.
Open feed →Daily
NOAA CoastWatch
Ocean color, sea surface temperature and drift products used for shoreward-bound detection.
Open feed →Study releases
NOAA NCCOS
Economic impact modeling for Puerto Rico, the U.S. Virgin Islands and coastal Florida.
Open feed →