**Notice to Users: NOAA/NESDIS plans to discontinue all operational 50km resolution satellite coral bleaching heat stress monitoring products.
They are being replaced with higher resolution 5km satellite products. 50km products to be retired and replaced with 5km products are:
sea surface temperature (SST), SST Anomaly, Coral Bleaching HotSpot, coral bleaching Degree Heating Week, Bleaching Alert Area, and the Virtual Stations.
Archived data and images will still be available at https://coralreefwatch.noaa.gov.
Research-supported 5km resolution versions of the products and images are available now at:
A 30-day comment period is now open for users to send objections or concerns about this product retirement. Send comments to
50km Coral Bleaching HotSpot
Data Formats Available
and image archives from NOAA/NESDIS' Office of Satellite and Product Operations (OSPO).
All of our
satellite data products are available on Google Earth.
Data animations and downloadable animated GIF files from NOAA/NESDIS OSPO.
The NOAA Coral Reef Watch (CRW) twice-weekly global 50km Coral Bleaching HotSpot
product presented here measures occurrence and magnitude of instantaneous heat stress,
potentially resulting in coral bleaching. The scale goes from 0 to 5 °C. HotSpot values
of 1 °C or more indicate heat stress leading to coral bleaching and are highlighted in
yellow to red colors. Spatial resolution is one-half degree precisely.
Additional description in the 50km products tutorial.
Technical details on the methodology page and in
Liu et al. 2013.