Experimental Lake Erie Harmful Algal Bloom (HAB) Tracker

The upper left panel below shows the HAB Tracker lake surface forecast. The other panels provide additional information on lake conditions. See panel descriptions below. For more information on the HAB Tracker, visit the About the Lake Erie HAB Tracker page. For the latest images, refresh your browser and/or clear its cache.

HAB Tracker forecast

GLCFS nowcast & 5-day wind speed forecast

Latest reported microcystins concentrations

The HAB Tracker doesn't predict toxin concentrations, so the latest measurements are given here to provide context. Microcystins are the toxic compounds most commonly associated with lake Erie HABs. The symbol shape indicates the depth at which weekly sampling occurred at each monitoring station.  Surface is approximately 0.75 m deep in the water column. Symbol colors correspond with thresholds identified by the Ohio Environmental Protection Agency</a>. Microcystin concentrations exceeding the Elevated Recreational Public Health Advisory are indicated in red. Note that the HAB Tracker uses a different color scale – the HAB Tracker does not indicate toxin concentrations.

GLCFS nowcast & 5-day wave height forecast

Panel descriptions:

HAB Tracker forecast - This panel depicts the HAB Tracker 5-day forecast. The color scale indicates surface HAB concentration in terms of cyanobacterial chlorophyll-a.

GLCFS nowcast & 5-day wind speed forecast - The Great Lakes Coastal Forecasting System (GLCFS) nowcast uses observed winds from stations surrounding the lake, while the forecast uses the National Digital Forecast Database generated by the National Weather Service.

Latest reported microcystins concentrations - The HAB Tracker doesn't predict toxin concentrations, so the latest measurements are given here to provide context. Microcystins are the toxic compounds most commonly associated with lake Erie HABs. The symbol shape indicates the depth at which weekly sampling occurred at each monitoring station. "Surface" is approximately 0.75 m deep in the water column. Symbol colors correspond with thresholds identified by the Ohio Environmental Protection Agency. Microcystins concentrations exceeding the Elevated Recreational Public Health Advisory are indicated in red. Note that the HAB Tracker uses a different color scale – the HAB Tracker does not indicate toxin concentrations.

GLCFS nowcast & 5-day wave height forecast - The wave height forecast is produced by the Great Lakes Coastal Forecasting System (GLCFS).

For more information on how the HAB Tracker works, who uses it, and what's next in research and operations, visit our About the Lake Erie HAB Tracker page. Note: NOAA also provides an operational twice weekly HAB forecast and publishes it in the Lake Erie HAB Bulletin.

Please view the laboratory's Disclaimer and Intellectual Property Notice. If you would like to provide feedback on the HAB Tracker, access the user survey developed by the Cooperative Institute for Great Lakes Research (CIGLR). (This is not a NOAA survey.)


Latest satellite-derived data used by the HAB Tracker

Sensors attached to satellites gather data, which is processed into the cyanobacterial index, an indicator of the abundance, or biomass, of the cyanobacteria associated with HABs. Processed satellite imagery is provided by the NOAA HAB Operational Forecasting System. The cyanobacterial index scale is converted to a cyanobacterial chlorophyll scale for use in the HAB Tracker, a similar indicator of cyanobacterial abundance.

True-color satellite image of Lake Erie

Latest relatively cloud-free MODIS satellite image of Lake Erie. For additional satellite imagery of Lake Erie, visit the NOAA Great Lakes CoastWatch webpage.

HABs extent analysis

Latest HAB extent analysis used to update the bloom location in the HAB Tracker model. HAB extent analysis is provided by NOAA HAB Operational Forecasting System, derived from NASA MODIS Aqua/Terra, or Copernicus Sentinal 3 satellite data.

Latest relatively cloud-free MODIS satellite image of Lake Erie. For additional satellite imagery of Lake Erie, visit the NOAA Great Lakes CoastWatch webpage.

Latest HAB extent analysis used to update the bloom location in the HAB Tracker model. HAB extent analysis is provided by NOAA HAB Operational Forecasting System, derived from NASA MODIS Aqua/Terra, or Copernicus Sentinal 3 satellite data.


HAB Tracker forecast of Microcystis vertical distribution

Lake Erie HABs usually consist of colonies of the cyanobacterium Microcystis, which float to the surface during calm periods and are mixed down into the water column during windy periods. Mixing of the water column is influenced by wind speed, heating or cooling of the surface water, and thermal stratification—layering of the water due to the difference in density between warm surface water and cooler bottom water. The model assumes that Microcystis colonies float, but it is recognized that some colonies sink. Therefore, it may be anticipated that sinking Microcystis colonies, and other sinking algae, will accumulate on the bottom under the same calm conditions that lead to formation of floating scums at the surface.

The panels below depict model-predicted vertical distribution of buoyant Microcystis colonies, and temperature. Click on a station location (+) in the upper right image to see forecast information for a particular station.

HAB Tracker forecast at selected station

HAB Tracker forecast at selected station

Click on + to select station and update plots

WE2 WE4 WE6 WE8 WE12 WE13 WE14 WE15 WE25 DWE NDBC45005 SouthPass 45176 1D vertical profile station map

Vertical distribution of buoyant Microcystis colonies at the selected station.

Station locations and modeled lake surface temperature.

Modeled water temperature at selected station

Modelled vertical temperature profile for the selected location

Vertical mixing conditions for buoyant Microcystis

Modelled vertical distribution of floating Microcystis colonies that would result from the mixing conditions at the station

Time series of the vertical profile of water temperature at the station location from the Great Lakes Coastal Forecasting System model for the nowcast and forecast periods.

This figure shows whether floating Microcystis colonies would be likely to form surface scums or to mix uniformly from surface to bottom under the modeled vertical mixing conditions at the station. This figure does not predict the presence of HABs at the station.



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