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 Degree Heating Week
Data Formats Available
The NOAA Coral Reef Watch (CRW) twice-weekly 50-km satellite coral bleaching Degree
Heating Week (DHW) product presented here shows accumulated thermal stress, which can lead to coral bleaching and death.
The scale goes from 0 to 16 °C-weeks. Spatial resolution is one-half degree precisely. The DHW product
accumulates the instantaneous bleaching thermal stress (measured by Coral Bleaching HotSpots) during the most-recent
12-week period. It is directly related to the timing and intensity of coral bleaching. Significant
coral bleaching usually occurs when DHW values reach 4 °C-weeks. By the time DHW
values reach 8 °C-weeks, widespread bleaching is likely and significant mortality can
Additional description in the 50-km products tutorial.
Technical details on the methodology page and in
Liu et al. 2013.