Coral Bleaching Alert Area

Identifies areas where coral bleaching heat stress satisfies specific criteria (see below) based on NOAA Coral Reef Watch (CRW) HotSpot and Degree Heating Week (DHW) values. This bleaching alert area (BAA) provides a convenient tool for users to monitor recent thermal conditions.

Note: This is the single-day BAA product, not the 7-day BAA product that NOAA CRW also produces.

Stress Level Definition Ecosystem Impact
No Stress HotSpot ≤ 0 n/a
Watch 0 < HotSpot < 1 n/a
Warning 1 ≤ HotSpot and 0 < DHW < 4 Possible Bleaching
Alert Level 1 1 ≤ HotSpot and 4 ≤ DHW < 8 Bleaching Likely
Alert Level 2 1 ≤ HotSpot and 8 ≤ DHW Mortality Likely