NOAA Coral Reef Watch will discontinue all operational twice-weekly 50km satellite coral bleaching heat stress monitoring products in April 2020.

These products are being replaced with higher resolution daily 5km satellite products.

Archived 50km data and images will still be available at If you need any assistance, please contact


50km Sea Surface Temperature
clickable global map of SSTs
SSTs in Mediterranean and Red Sea SSTs around India SSTs east of Japan SSTs around Hawaii SSTs around Central America SSTs West of Africa SSTs in Mediterranean and Red Sea SSTs around southern Africa SSTs in the southern Indian Ocean SSTs around Australia SSTs in the South Pacific SSTs west of South America SSTs east of Brazil SSTs 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 NOAA/NESDIS' Office of Satellite and Product Operations (OSPO).
Google Earth Google Earth
All of our satellite data products are available on Google Earth.
Virtual Stations 50km 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 NOAA/NESDIS OSPO.

The NOAA Coral Reef Watch (CRW) twice-weekly global 50km Sea Surface Temperature (SST) product shows the nighttime ocean temperature, at the surface, from the Advanced Very High Resolution Radiometer (AVHRR) sensor on NOAA's polar-orbiting satellites. The SST scale goes from -2 to 34 degrees C. Spatial resolution of the product is one-half degree precisely.

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