Notice: CRW's twice-weekly 50 km products will update around 2 pm on Mondays and Thursdays (U.S. Eastern Time) starting from 1 February 2016, using a new 50 km SST analysis. Click here to see details.
50-km Coral Bleaching HotSpot
clickable global map of coral bleaching hotspots
hotspots in Mediterranean and Red Sea hotspots around India hotspots east of Japan hotspots around Hawaii hotspots around Central America hotspots West of Africa hotspots in Mediterranean and Red Sea hotspots around southern Africa hotspots in the southern Indian Ocean hotspots around Australia hotspots in the South Pacific hotspots west of South America hotspots east of Brazil hotspots around southern Africa
Click on the image to zoom in.

Current images: Global | E.Hem. | W.Hem. | Pacific | Caribbean | Coral Triangle

Data Formats Available

images Image Archives
Regional imagery and image archives from OSDPD.
Google Earth Google Earth
All of our satellite data products are available on Google Earth.
Virtual Stations 50-km Virtual Stations
Imagery, graphs, ASCII data, and e-mail alerts for reef pixels around the world.
animations Animations
Data animations and downloadable animated GIF files from OSPO.
HDF data HDF data files
Raw data in Hierarchical Data Format (HDF), with free NOAA viewing software.

The NOAA Coral Reef Watch (CRW) twice-weekly 50-km Coral Bleaching HotSpot product presented here measures occurrence and magnitude of instantaneous thermal stress, potentially resulting in coral bleaching. The scale goes from 0 to 5 °C. HotSpot values of 1 °C or more indicate thermal stress leading to coral bleaching and are highlighted in yellow to red colors. Spatial resolution is one-half degree precisely.

Additional description in the 50-km products tutorial.
Technical details on the methodology page and in Liu et al. 2013.