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Red Tide Current Status

Red Tide Status (October 20, 2017)

The Florida red tide organism, Karenia brevis, was present in Northwest and Southwest Florida over the past week.

In Southwest Florida, K. brevis was observed at background to low concentrations in three samples collected from Pinellas County, background to very low concentrations in two samples collected from Manatee County, and background concentrations in three samples collected from Sarasota County.

In Northwest Florida, K. brevis occurred at background concentrations in one sample collected from Bay County and in three samples collected from Franklin County.

Additional samples collected throughout Florida over the past week did not contain K. brevis.

Forecasts for Southwest Florida by the USF-FWC Collaboration for Prediction of Red TidesExternal Website predict net offshore movement of surface waters and net onshore movement of subsurface waters from Pinellas to Lee counties over the next three days.

Red Tide Status Map (October 20, 2017)

View statewide map Adobe PDF (PDF 300KB) (October 20, 2017)

Regional Status Reports and Maps (October 20, 2017)

Southwest coast report Adobe PDF (PDF 120KB) and map Adobe PDF (PDF 313KB)
East coast report Adobe PDF (PDF 62KB) and map Adobe PDF (PDF 300KB)
Northwest coast report Adobe PDF (PDF 68KB) and map Adobe PDF (PDF 289KB)

To see detailed information on this week's samples, view the current Statewide Google Earth map for October 20, 2017. 

By using Google Earth, you can zoom in to specific locations and click on stations to see detailed information, including sample date and cell concentration. You must have Google Earth installed on your computer to view this map; the software can be downloaded from the Google Earth website.External Website

The FWRI Red Tide Status Line is now available to callers throughout the state. FWRI updates the recording each Friday by 5 p.m. Red Tide Status Line: 866-300-9399 (toll-free inside Florida only); 727-552-2448 (outside Florida).

Reports are updated on Friday afternoon except during holidays, in which case the report will be released on the closest day. Additional information, if available, is provided on Wednesday afternoon. To receive an e-mail when the current status has been updated, visit our subscription area.

FWC's Red Tide Action Report

Red tide is a naturally-occurring microscopic alga that has been documented along Florida’s Gulf Coast since the 1840’s and occurs nearly every year. Blooms, or higher-than-normal concentrations, of the Florida red tide alga, Karenia brevis, frequently occur in the Gulf of Mexico. Red tide begins in the Gulf of Mexico 10 to 40 miles offshore and can be transported inshore by winds and currents.

FWC Actions and Partnerships:

Red Tide Resources

Previous Regional Status Reports and Maps

October 13, 2017

Southwest coast report Adobe PDF (PDF 122KB) and map Adobe PDF (PDF 238KB)
East coast report Adobe PDF (PDF 54KB) and map Adobe PDF (PDF 178KB)
Northwest coast report Adobe PDF (PDF 65KB) and map Adobe PDF (PDF 290KB)
Google Earth map

October 6, 2017

Southwest coast report Adobe PDF (PDF 97KB) and map Adobe PDF (PDF 240KB)
East coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 254KB)
Northwest coast report Adobe PDF (PDF 51KB) and map Adobe PDF (PDF 292KB)
Google Earth map

September 29, 2017

Southwest coast report Adobe PDF (PDF 118KB) and map Adobe PDF (PDF 239KB)
East coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 179KB)
Northwest coast report Adobe PDF (PDF 54KB) and map Adobe PDF (PDF 291KB)
Google Earth map

September 22, 2017

Southwest coast report Adobe PDF (PDF 115KB) and map Adobe PDF (PDF 239KB)
East coast report Adobe PDF (PDF 54KB) and map Adobe PDF (PDF 180KB)
Northwest coast report Adobe PDF (PDF 72KB) and map Adobe PDF (PDF 289KB)
Google Earth map

Additional archived status maps can be found on FlickrExternal Website

Key for Results

DescriptionKarenia brevis cells/literPossible Effects (K. brevis only)
NOT PRESENT - BACKGROUND background levels of 1,000 cells or less None anticipated
VERY LOW >1,000 to 10,000 Possible respiratory irritation; shellfish harvesting closures > 5,000 cells/L
LOW >10,000 to 100,000 Respiratory irritation, possible fish kills and bloom chlorophyll probably detected by satellites at upper limits
MEDIUM >100,000 to 1,000,000 Respiratory irritation and probable fish kills
HIGH >1,000,000

As above plus discoloration


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