The NOAA Coral Reef Watch (CRW) daily global 5km satellite Bleaching Alert Area 365-day Maximum product presentes the highest coral bleaching heat stress levels reached during the most recent, consecutive 365 days up to and including the stated data date (i.e., the date shown in the image title). It is a maximum composite of CRW's daily single-day global 5km satellite Bleaching Alert Area product. Please see the product description posted on this web page to learn about our single-day Bleaching Alert Area product.

This product provides a cumulative, time-integrated perspective on the spatial extent of global bleaching heat stress exposure focusing on a full annual cycle (365 days), given that local seasonal cycles are not synchronized among global reefs. Based on this product, the percentage of 5 km reef-containing pixels within each of the three tropical ocean basins (Pacific, Atlantic, and Indian Oceans) and globally that have experienced bleaching-level heat stress (Bleaching Alert Level 1 or higher) at any time during a rolling 365-day period is provided via CRW's daily 365-day Bleaching Stress Extent product.

The definition of CRW's coral bleaching heat stress levels is provided below. The heat stress level at a 5km satellite data grid, on any day, is based on CRW's daily global 5km Coral Bleaching HotSpot and Degree Heating Week (DHW) products for that day, as presented in the daily global single-day 5km Bleaching Alert Area product.