Harmful Algal Bloom Forecasts

Harmful algal blooms (HABs) are a rapid growth of algae that produce toxic or harmful effects on people, fish, marine mammals, birds and local economies. NOAA HAB forecasts aid those who respond to bloom impacts and help members of the public make informed decisions if a bloom is affecting their area.

  • Gulf of Mexico HAB Forecast
    NOAA issues weekly forecasts for the eastern and western Gulf of Mexico when conditions become favorable for HABs of the red tide species, Karenia brevis (typically in August). Twice-weekly forecasts are released during an active bloom with additional updates when conditions change.

  • Lake Erie HAB Forecast
    NOAA issues forecasts for Lake Erie after sampling confirms presence of the HAB species Microcystis, during bloom season (typically July to October) when conditions are optimal for growth. The Lake Erie HAB Forecast is updated daily and provides information on current extent and trajectory of HABs as they form.
Blooms of harmful algae like this one off the coast of Texas
Blooms of harmful algae, like this "red tide" off the coast of Texas, can cause illness and death in humans and animals.