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Current bleaching conditions around the world using data from NOAA's Coral Reef Watch program. Data updates daily. A brief summary of the item is not available. Add a brief summary about the item.

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Item created: Apr 15, 2019 Item updated: Feb 14, 2025 View count: 492,539

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Coral reefs are one of the most diverse and ecologically important areas of the world. However, many reefs, are threatened by ocean temperatures that are increasingly becoming warmer than the coral animals' natural tolerance. According to NOAA, when water is too warm, corals will expel the algae (zooxanthellae) living in their tissues causing the coral to turn completely white. This is called coral bleaching. When a coral bleaches, it is not dead. Corals can survive a bleaching event, but they are under more stress and are subject to mortality.

The 
NOAA Coral Reef Watch program uses satellite data to provide current reef environmental conditions to quickly identify areas at risk for coral bleaching. The station data displayed in this map are derived from satellite based measurements of ocean temperature. These "virtual stations" are not actual buoys or in situ stations transmitting data, rather a spatial analyses for reef locations around the world are derived from 5 km resolution raster data. 

There are 213 points for the virtual stations around the world along with polygons describing the major tropical coral reef systems. 

Each station has several variables: 
  • Alert Level: an index of the likelihood of coral bleaching, scaled from 0 (no heat stress) to 4 (coral mortality likely) based on the attributes below
  • Sea surface temperature: average temperature of the ocean surface derived from satellite measurements
  • Temperature anomaly: a comparison of the current surface temperature to the 1981-2010 historical average
  • Hotspots: number of degrees above the coral's threshold tolerance
  • Degree Heating Weeks: accumulated thermal stress experienced by corals
Maintenance
Revisions
  • Jan 25, 2024: Updated Legend text for Area Layer, adding clarity
  • Jul 28, 2023: Applied updated Symbology and Popups from Coral Reef Bleaching Stations Web Map

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          Data updated: Feb 14, 2025, 9:57 PM

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