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Understanding Algal Blooms During Hurricane Season: Outlook and Implications

June 17, 2026 · The Clime Team
Understanding Algal Blooms During Hurricane Season: Outlook and Implications

Algal blooms, particularly harmful algal blooms (HABs), are a significant environmental concern in the United States, especially during hurricane season. These blooms can adversely affect water quality, aquatic ecosystems, and human health. Understanding the dynamics of HABs during hurricane season is crucial for effective monitoring and management.

What Are Harmful Algal Blooms (HABs)?

HABs occur when algae grow rapidly, producing toxins harmful to humans, animals, and the environment. These blooms can lead to health issues, economic losses, and ecological damage. Factors such as nutrient pollution and warmer water temperatures can intensify HABs. (epa.gov)

How Do Hurricanes Influence Algal Blooms?

Hurricanes can impact HABs in several ways:

  • Nutrient Redistribution: Hurricanes can stir up sediments and nutrients in the water, potentially fueling algal growth.

  • Water Temperature Changes: Storms can alter sea surface temperatures, affecting algal growth rates.

  • Salinity Variations: Heavy rainfall from hurricanes can decrease salinity, influencing the types of algae that thrive.

The exact impact varies based on the storm's intensity, location, and timing.

What Is the Outlook for Algal Blooms During the 2026 Hurricane Season?

As of June 17, 2026, the Atlantic hurricane season has not yet begun. The season officially starts on June 1 and ends on November 30 each year. (en.wikipedia.org) While specific forecasts for algal blooms during the 2026 season are not yet available, historical data can provide some insights.

For instance, in 2024, a moderately severe cyanobacterial bloom occurred in western Lake Erie, with a severity index of 6.6. (coastalscience.noaa.gov) Such data can help anticipate potential HAB events during hurricane seasons.

How Are Algal Blooms Monitored and Forecasted?

Monitoring and forecasting HABs involve several approaches:

  • Satellite Imagery: Agencies like NASA use satellite data to detect and monitor algal blooms. (airbornescience.nasa.gov)

  • Forecast Models: The U.S. Environmental Protection Agency (EPA) has developed models to predict the probability of cyanobacterial HABs in lakes across the U.S. during the bloom season from March to November. (epa.gov)

  • Surveillance Systems: The One Health Harmful Algal Bloom System (OHHABS) collects data on human and animal illnesses related to HABs, aiding in understanding and preventing associated health issues. (cdc.gov)

How Can Communities Prepare for Algal Blooms During Hurricane Season?

Communities can take several steps to prepare for potential HABs during hurricane season:

  • Stay Informed: Regularly check updates from local environmental agencies and health departments regarding water quality and HAB advisories.

  • Limit Exposure: Avoid contact with water bodies that have reported HABs, as exposure can lead to health issues.

  • Report Observations: Use tools like the EPA's bloomWatch app to report suspected HABs, contributing to broader monitoring efforts. (epa.gov)

Conclusion

While the 2026 Atlantic hurricane season has not yet begun, understanding the relationship between hurricanes and algal blooms is essential for effective environmental management. Ongoing monitoring and forecasting efforts play a crucial role in mitigating the impacts of HABs on communities and ecosystems.

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