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Gulf of Mexico Harmful Algal Bloom Forecast

In the Gulf of Mexico, some harmful algal blooms are caused by the rapid growth of the microscopic algae species Karenia brevis (commonly called red tide). Red tide can cause respiratory illness and eye irritation in humans. It can also kill marine life. Blooms are often patchy, so impacts vary by beach and throughout the day.

NOAA monitors conditions daily and issues twice-weekly forecasts for red tide blooms in the Gulf of Mexico and East Coast of Florida. You can find up-to-date information on where a bloom is located and a 3–4 day forecast for potential respiratory irritation by selecting a region below. This information may help you find an unaffected beach if you are visiting the coast.

For responders and researchers: Are you involved in K. brevis HAB event response or research?

If you are a local coastal resource manager, public health official, or research scientist, you can sign up to receive a more detailed forecast regularly by email. These forecasts are decision support tools that provide an analysis of the K. brevis bloom location and reported impacts, as well as forecasts of potential development, intensification, transport, and impacts.

Detailed forecasts are sent to subscribers:

  • Once weekly beginning in August when conditions typically become favorable for a bloom.
  • Twice weekly during a bloom.

For more specifics on the Bulletins visit the Gulf of Mexico HAB Bulletin Guide.


Forecast Archive (Updated 1 week after bulletin issued)

Southwest Florida
Northwest Florida to Louisiana

Click on the icon of Adobe Acrobat Reader link to download the PDF reader - Adobe Acrobat Reader

Forecasts help people make decisions about where and when to visit areas that may be temporarily affected by a bloom.
NOAA's red tide forecasts can help beach goers identify where and when beaches may be temporarily affected by a bloom.