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NOAA and partners are forecasting a moderate harmful algal bloom for western Lake Erie this summer.

bar graph of bloom severity forecast compared to previous years, dating back to 2002.
 

NOAA and partners are forecasting a moderate harmful algal bloom for western Lake Erie this summer. The 2026 summer bloom is expected to measure 3.5, with a potential range of 3 to 4.5 on the severity index.